Fortran: Accept -std=f2023 support, update line-length for Fortran 2023

Message ID ce3c556f-a63e-4328-bab3-6530126f5187@codesourcery.com
State Accepted
Headers
Series Fortran: Accept -std=f2023 support, update line-length for Fortran 2023 |

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Context Check Description
snail/gcc-patch-check success Github commit url

Commit Message

Tobias Burnus Nov. 16, 2023, 1:01 p.m. UTC
  This adds -std=f2023, which is mostly a prep patch for future changes.

However, Fortran 2023, https://j3-fortran.org/doc/year/23/23-007r1.pdf changes two things which is taken
care in this patch:

(A) In "6.3.2.1 Free form line length":

Fortran 2018: "If a line consists entirely of characters of default kind (7.4.4), it shall contain at most 132 characters"
Fortran 2023: "A line shall contain at most ten thousand characters."

(B) In "6.3.2.6 Free form statements":
Fortran 2018: "A statement shall not have more than 255 continuation lines."
Fortran 2023: "A statement shall not have more than one million characters."

I have not added a testcase for exceeding the latter but otherwise there are new
tests and I had to add a couple of -std=f2018 to existing tests.

Comments, suggestions, approval?

Tobias

PS: I find it funny that -std=c23, -std=c++23 and -std=f2023 will get added in the same GCC release.

PPS: I did not bother adding .f23 as file extension; I believe that also .f18 is unsupported.
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Comments

Tobias Burnus Nov. 17, 2023, 11:38 a.m. UTC | #1
Hi Harald, hi all,

On 16.11.23 20:30, Harald Anlauf wrote:
> On 11/16/23 14:01, Tobias Burnus wrote:
>> This adds -std=f2023, which is mostly a prep patch for future changes.
...
>> (B) In "6.3.2.6 Free form statements":
>> Fortran 2018: "A statement shall not have more than 255 continuation
>> lines."
>> Fortran 2023: "A statement shall not have more than one million
>> characters."
>
> this is really a funny change: we're not really prepared to handle
> this.

I can confirm this. I tried to get it working in scanner.cc but due to
the re-parsing it is quite difficult to get it right; the main problem
is that we keep reparsing code ("gfc_current_locus = old_loc"), such
that a simple count will be wrong.

→ Now tracked at https://gcc.gnu.org/PR112586


> According to the standard one can have 999999 lines with only
> "&" and then an ";", but then only 100 lines with 10000 characters.

I believe a single '&' is not valid, you either need '&&' or something
else + '&'; thus, you can have only half a million lines + 1.

In the code, I still use 1,000,000 but now with a comment.

> There is a similar wording for fixed-form which you overlooked:
Ups - fixed.
> If you think that we need testcases for fixed-form, add them,
> or forget them.  I don't bother.
I added one.

> - there are existing testcases continuation_5.f, continuation_6.f,
>   thus I suggest to rename your new continuation_{5,6}.f90 to
>   continuation_17.f90+ .

Done. We are rather inconsistent whether we enumerate <file>.f{,90}
together or separately; as the suffix is shown, either works.

>
> - I don't understand your new testcase line_length_14.f90 .
>   This is supposed to test -std=gnu, but then -std=gnu is not a
>   standard but a moving target, which is why you had to adjust
>   existing testcases.
>   So what does it buy us beyond line_length_1{2,3}.f90 ?

Well, it ensures that the warning is not only shown for -std=f2023 but
also for -std=f2028 and (current -std=gnu). In general, I think it is
useful to check the lower and the upper bound.

I have now removed it - as it is unlikely that we would regress on such
changes.

>> PPS: I did not bother adding .f23 as file extension; I believe that also
>> .f18 is unsupported.
> I never use extensions other than .f90 for portable code.

Likewise  - especially as '.f95' starts out as Fortran code that
complies to -std=f95 but slowly Fortran 2003 or later code creeps in. I
think that's fine but then one can also directly use .f90. (Most code
does so.)

Unless there are follow up comments, I will commit it later today.

Thanks for the comments!

Tobias

PS: I fixed the wording issue in the subject line of the email and
header. I first wrote 'support' but that sounded a bit as if F2023 is
supported. Hence, I wrote 'Accept' and did not remove 'support'.
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Mikael Morin Nov. 17, 2023, 12:06 p.m. UTC | #2
Le 17/11/2023 à 12:38, Tobias Burnus a écrit :
> 
> Unless there are follow up comments, I will commit it later today.
> 
I skimmed quickly through the patch, and noticed one typo to fix:

 > diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
 > index 10387e39501..5f87b330a22 100644
 > --- a/gcc/fortran/invoke.texi
 > +++ b/gcc/fortran/invoke.texi
 > @@ -958,8 +959,8 @@ The following example will trigger the warning.
 >  @item -Wampersand
 >  Warn about missing ampersand in continued character constants. The
 >  warning is given with @option{-Wampersand}, @option{-pedantic},
 > -@option{-std=f95}, @option{-std=f2003}, @option{-std=f2008} and
 > -@option{-std=f2018}. Note: With no ampersand given in a continued
 > +@option{-std=f95}, @option{-std=f2003}, @option{-std=f2008}, 
@option{-std=f2018}
 > +and @option{-std=f203}. Note: With no ampersand given in a continued
 >  character constant, GNU Fortran assumes continuation at the first
 >  non-comment, non-whitespace character after the ampersand that
 >  initiated the continuation.

s/f203/f2023/
  
Harald Anlauf Jan. 2, 2024, 7:31 p.m. UTC | #3
Dear all,

we might want to update changes.html to reflect this.  How about:

diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 403feb06..9b16f5e3 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -284,6 +284,11 @@ a work-in-progress.</p>

  <h3 id="fortran">Fortran</h3>
  <ul>
+  <li>The compiler now accepts the <code>-std=f2023</code> option, which
+    has been added in preparation of support of Fortran 2023.  This option
+    increases the line-length limit for source in free-form to 10000, and
+    statements may have up to 1 million characters.
+  </li>
    <li> With the <code>-save-temps</code> option, preprocessed files
      with the <code>.fii</code> extension will be generated from
      free-form source files such as <code>.F90</code> and


Cheers,
Harald


Am 17.11.23 um 12:38 schrieb Tobias Burnus:
> Hi Harald, hi all,
> 
> On 16.11.23 20:30, Harald Anlauf wrote:
>> On 11/16/23 14:01, Tobias Burnus wrote:
>>> This adds -std=f2023, which is mostly a prep patch for future changes.
> ...
>>> (B) In "6.3.2.6 Free form statements":
>>> Fortran 2018: "A statement shall not have more than 255 continuation
>>> lines."
>>> Fortran 2023: "A statement shall not have more than one million
>>> characters."
>>
>> this is really a funny change: we're not really prepared to handle
>> this.
> 
> I can confirm this. I tried to get it working in scanner.cc but due to
> the re-parsing it is quite difficult to get it right; the main problem
> is that we keep reparsing code ("gfc_current_locus = old_loc"), such
> that a simple count will be wrong.
> 
> → Now tracked at https://gcc.gnu.org/PR112586
> 
> 
>> According to the standard one can have 999999 lines with only
>> "&" and then an ";", but then only 100 lines with 10000 characters.
> 
> I believe a single '&' is not valid, you either need '&&' or something
> else + '&'; thus, you can have only half a million lines + 1.
> 
> In the code, I still use 1,000,000 but now with a comment.
> 
>> There is a similar wording for fixed-form which you overlooked:
> Ups - fixed.
>> If you think that we need testcases for fixed-form, add them,
>> or forget them.  I don't bother.
> I added one.
> 
>> - there are existing testcases continuation_5.f, continuation_6.f,
>>   thus I suggest to rename your new continuation_{5,6}.f90 to
>>   continuation_17.f90+ .
> 
> Done. We are rather inconsistent whether we enumerate <file>.f{,90}
> together or separately; as the suffix is shown, either works.
> 
>>
>> - I don't understand your new testcase line_length_14.f90 .
>>   This is supposed to test -std=gnu, but then -std=gnu is not a
>>   standard but a moving target, which is why you had to adjust
>>   existing testcases.
>>   So what does it buy us beyond line_length_1{2,3}.f90 ?
> 
> Well, it ensures that the warning is not only shown for -std=f2023 but
> also for -std=f2028 and (current -std=gnu). In general, I think it is
> useful to check the lower and the upper bound.
> 
> I have now removed it - as it is unlikely that we would regress on such
> changes.
> 
>>> PPS: I did not bother adding .f23 as file extension; I believe that also
>>> .f18 is unsupported.
>> I never use extensions other than .f90 for portable code.
> 
> Likewise  - especially as '.f95' starts out as Fortran code that
> complies to -std=f95 but slowly Fortran 2003 or later code creeps in. I
> think that's fine but then one can also directly use .f90. (Most code
> does so.)
> 
> Unless there are follow up comments, I will commit it later today.
> 
> Thanks for the comments!
> 
> Tobias
> 
> PS: I fixed the wording issue in the subject line of the email and
> header. I first wrote 'support' but that sounded a bit as if F2023 is
> supported. Hence, I wrote 'Accept' and did not remove 'support'.
> -----------------
> Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 
> 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: 
> Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; 
> Registergericht München, HRB 106955
  
Steve Kargl Jan. 2, 2024, 7:37 p.m. UTC | #4
On Tue, Jan 02, 2024 at 08:31:15PM +0100, Harald Anlauf wrote:
> 
> we might want to update changes.html to reflect this.  How about:
> 
> diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
> index 403feb06..9b16f5e3 100644
> --- a/htdocs/gcc-14/changes.html
> +++ b/htdocs/gcc-14/changes.html
> @@ -284,6 +284,11 @@ a work-in-progress.</p>
> 
>  <h3 id="fortran">Fortran</h3>
>  <ul>
> +  <li>The compiler now accepts the <code>-std=f2023</code> option, which
> +    has been added in preparation of support of Fortran 2023.  This option
> +    increases the line-length limit for source in free-form to 10000, and
> +    statements may have up to 1 million characters.
> +  </li>
>    <li> With the <code>-save-temps</code> option, preprocessed files
>      with the <code>.fii</code> extension will be generated from
>      free-form source files such as <code>.F90</code> and
> 

LGTM.
  
Harald Anlauf Jan. 2, 2024, 7:51 p.m. UTC | #5
Am 02.01.24 um 20:37 schrieb Steve Kargl:
> On Tue, Jan 02, 2024 at 08:31:15PM +0100, Harald Anlauf wrote:
>>
>> we might want to update changes.html to reflect this.  How about:
>>
>> diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
>> index 403feb06..9b16f5e3 100644
>> --- a/htdocs/gcc-14/changes.html
>> +++ b/htdocs/gcc-14/changes.html
>> @@ -284,6 +284,11 @@ a work-in-progress.</p>
>>
>>   <h3 id="fortran">Fortran</h3>
>>   <ul>
>> +  <li>The compiler now accepts the <code>-std=f2023</code> option, which
>> +    has been added in preparation of support of Fortran 2023.  This option
>> +    increases the line-length limit for source in free-form to 10000, and
>> +    statements may have up to 1 million characters.
>> +  </li>
>>     <li> With the <code>-save-temps</code> option, preprocessed files
>>       with the <code>.fii</code> extension will be generated from
>>       free-form source files such as <code>.F90</code> and
>>
> 
> LGTM.
> 

Thanks, this is now pushed.
  

Patch

Fortran: Accept -std=f2023 support, update line-length for Fortran 2023

This patch accepts -std=f2023, uses it by default and bumps for the
free-source form the line length to 10,000 and the statement length
alias number of continuation lines to unlimited.

gcc/fortran/ChangeLog:

	* gfortran.texi (_gfortran_set_options): Document GFC_STD_F2023.
	* invoke.texi (std,pedantic,Wampersand,Wtabs): Add -std=2023.
	* lang.opt (std=f2023): Add.
	* libgfortran.h (GFC_STD_F2023, GFC_STD_OPT_F23): Add.
	* options.cc (set_default_std_flags): Add GFC_STD_F2023.
	(gfc_init_options): Set max_continue_free to 1,000,000.
	(gfc_post_options): Set flag_free_line_length if unset.
	(gfc_handle_option): Add OPT_std_f2023, set max_continue_free = 255
	for -std=f2003, f2008 and f2018.

gcc/testsuite/ChangeLog:

	* gfortran.dg/goacc/warn_truncated.f90: Add -std=f2018 option.
	* gfortran.dg/gomp/warn_truncated.f90: Likewise.
	* gfortran.dg/line_length_10.f90: Likewise.
	* gfortran.dg/line_length_11.f90: Likewise.
	* gfortran.dg/line_length_2.f90: Likewise.
	* gfortran.dg/line_length_5.f90: Likewise.
	* gfortran.dg/line_length_6.f90: Likewise.
	* gfortran.dg/line_length_7.f90: Likewise.
	* gfortran.dg/line_length_8.f90: Likewise.
	* gfortran.dg/line_length_9.f90: Likewise.
	* gfortran.dg/continuation_5.f90: New test.
	* gfortran.dg/continuation_6.f90: New test.
	* gfortran.dg/line_length_12.f90: New test.
	* gfortran.dg/line_length_13.f90: New test.
	* gfortran.dg/line_length_14.f90: New test.

 gcc/fortran/gfortran.texi                          |  11 +-
 gcc/fortran/invoke.texi                            |  21 +-
 gcc/fortran/lang.opt                               |   4 +
 gcc/fortran/libgfortran.h                          |   4 +-
 gcc/fortran/options.cc                             |  20 +-
 gcc/testsuite/gfortran.dg/continuation_5.f90       | 267 +++++++++++++++++++++
 gcc/testsuite/gfortran.dg/continuation_6.f90       | 267 +++++++++++++++++++++
 gcc/testsuite/gfortran.dg/goacc/warn_truncated.f90 |   1 +
 gcc/testsuite/gfortran.dg/gomp/warn_truncated.f90  |   1 +
 gcc/testsuite/gfortran.dg/line_length_10.f90       |   2 +-
 gcc/testsuite/gfortran.dg/line_length_11.f90       |   2 +-
 gcc/testsuite/gfortran.dg/line_length_12.f90       |  31 +++
 gcc/testsuite/gfortran.dg/line_length_13.f90       |  27 +++
 gcc/testsuite/gfortran.dg/line_length_14.f90       |  28 +++
 gcc/testsuite/gfortran.dg/line_length_2.f90        |   2 +-
 gcc/testsuite/gfortran.dg/line_length_5.f90        |   2 +-
 gcc/testsuite/gfortran.dg/line_length_6.f90        |   2 +-
 gcc/testsuite/gfortran.dg/line_length_7.f90        |   2 +-
 gcc/testsuite/gfortran.dg/line_length_8.f90        |   2 +-
 gcc/testsuite/gfortran.dg/line_length_9.f90        |   2 +-
 20 files changed, 672 insertions(+), 26 deletions(-)

diff --git a/gcc/fortran/gfortran.texi b/gcc/fortran/gfortran.texi
index e7ffc294dc8..41857cc9038 100644
--- a/gcc/fortran/gfortran.texi
+++ b/gcc/fortran/gfortran.texi
@@ -3477,11 +3477,12 @@  standard.  Possible values are (bitwise or-ed) @code{GFC_STD_F77} (1),
 @code{GFC_STD_F95} (8), @code{GFC_STD_F2003} (16), @code{GFC_STD_GNU}
 (32), @code{GFC_STD_LEGACY} (64), @code{GFC_STD_F2008} (128),
 @code{GFC_STD_F2008_OBS} (256), @code{GFC_STD_F2008_TS} (512),
-@code{GFC_STD_F2018} (1024), @code{GFC_STD_F2018_OBS} (2048), and
-@code{GFC_STD=F2018_DEL} (4096). Default: @code{GFC_STD_F95_OBS |
-GFC_STD_F95_DEL | GFC_STD_F95 | GFC_STD_F2003 | GFC_STD_F2008 |
-GFC_STD_F2008_TS | GFC_STD_F2008_OBS | GFC_STD_F77 | GFC_STD_F2018 |
-GFC_STD_F2018_OBS | GFC_STD_F2018_DEL | GFC_STD_GNU | GFC_STD_LEGACY}.
+@code{GFC_STD_F2018} (1024), @code{GFC_STD_F2018_OBS} (2048),
+@code{GFC_STD=F2018_DEL} (4096), and @code{GFC_STD=F2023} (8192).
+Default: @code{GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_F95 |
+GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F2008_TS | GFC_STD_F2008_OBS
+| GFC_STD_F77 | GFC_STD_F2018 | GFC_STD_F2018_OBS | GFC_STD_F2018_DEL
+| GFC_STD_F2023 | GFC_STD_GNU | GFC_STD_LEGACY}.
 @item @var{option}[1] @tab Standard-warning flag; prints a warning to
 standard error.  Default: @code{GFC_STD_F95_DEL | GFC_STD_LEGACY}.
 @item @var{option}[2] @tab If non zero, enable pedantic checking.
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
index 10387e39501..5f87b330a22 100644
--- a/gcc/fortran/invoke.texi
+++ b/gcc/fortran/invoke.texi
@@ -542,17 +542,17 @@  intermediate representation of the translated Fortran code, produced by
 @opindex @code{std=}@var{std} option
 @item -std=@var{std}
 Specify the standard to which the program is expected to conform,
-which may be one of @samp{f95}, @samp{f2003}, @samp{f2008},
-@samp{f2018}, @samp{gnu}, or @samp{legacy}.  The default value for
+which may be one of @samp{f95}, @samp{f2003}, @samp{f2008}, @samp{f2018},
+@samp{f2023}, @samp{gnu}, or @samp{legacy}.  The default value for
 @var{std} is @samp{gnu}, which specifies a superset of the latest
 Fortran standard that includes all of the extensions supported by GNU
 Fortran, although warnings will be given for obsolete extensions not
 recommended for use in new code.  The @samp{legacy} value is
 equivalent but without the warnings for obsolete extensions, and may
-be useful for old non-standard programs.  The @samp{f95},
-@samp{f2003}, @samp{f2008}, and @samp{f2018} values specify strict
-conformance to the Fortran 95, Fortran 2003, Fortran 2008 and Fortran
-2018 standards, respectively; errors are given for all extensions
+be useful for old non-standard programs.  The @samp{f95}, @samp{f2003},
+@samp{f2008}, @samp{f2018}, and @samp{f2023} values specify strict
+conformance to the Fortran 95, Fortran 2003, Fortran 2008, Fortran 2018
+and Fortran 2023 standards, respectively; errors are given for all extensions
 beyond the relevant language standard, and warnings are given for the
 Fortran 77 features that are permitted but obsolescent in later
 standards. The deprecated option @samp{-std=f2008ts} acts as an alias for
@@ -910,7 +910,8 @@  nonstandard practices, but not all.
 However, improvements to GNU Fortran in this area are welcome.
 
 This should be used in conjunction with @option{-std=f95},
-@option{-std=f2003}, @option{-std=f2008} or @option{-std=f2018}.
+@option{-std=f2003}, @option{-std=f2008}, @option{-std=f2018}
+or @option{-std=f2023}.
 
 @opindex @code{pedantic-errors}
 @item -pedantic-errors
@@ -958,8 +959,8 @@  The following example will trigger the warning.
 @item -Wampersand
 Warn about missing ampersand in continued character constants. The
 warning is given with @option{-Wampersand}, @option{-pedantic},
-@option{-std=f95}, @option{-std=f2003}, @option{-std=f2008} and
-@option{-std=f2018}. Note: With no ampersand given in a continued
+@option{-std=f95}, @option{-std=f2003}, @option{-std=f2008}, @option{-std=f2018}
+and @option{-std=f203}. Note: With no ampersand given in a continued
 character constant, GNU Fortran assumes continuation at the first
 non-comment, non-whitespace character after the ampersand that
 initiated the continuation.
@@ -1108,7 +1109,7 @@  of the Fortran Character Set.  For continuation lines, a tab followed
 by a digit between 1 and 9 is supported.  @option{-Wtabs} will cause a
 warning to be issued if a tab is encountered. Note, @option{-Wtabs} is
 active for @option{-pedantic}, @option{-std=f95}, @option{-std=f2003},
-@option{-std=f2008}, @option{-std=f2018} and
+@option{-std=f2008}, @option{-std=f2018}, @option{-std=f2023} and
 @option{-Wall}.
 
 @opindex @code{Wundefined-do-loop}
diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt
index 7236351a93c..08c75394aa0 100644
--- a/gcc/fortran/lang.opt
+++ b/gcc/fortran/lang.opt
@@ -883,6 +883,10 @@  std=f2018
 Fortran
 Conform to the ISO Fortran 2018 standard.
 
+std=f2023
+Fortran
+Conform to the ISO Fortran 2023 standard.
+
 std=f95
 Fortran
 Conform to the ISO Fortran 95 standard.
diff --git a/gcc/fortran/libgfortran.h b/gcc/fortran/libgfortran.h
index cb84b59c99a..bdddb317ab0 100644
--- a/gcc/fortran/libgfortran.h
+++ b/gcc/fortran/libgfortran.h
@@ -19,9 +19,10 @@  along with GCC; see the file COPYING3.  If not see
 
 
 /* Flags to specify which standard/extension contains a feature.
-   Note that no features were obsoleted nor deleted in F2003.
+   Note that no features were obsoleted nor deleted in F2003 nor in F2023.
    Please remember to keep those definitions in sync with
    gfortran.texi.  */
+#define GFC_STD_F2023		(1<<12)	/* New in F2023.  */
 #define GFC_STD_F2018_DEL	(1<<11)	/* Deleted in F2018.  */
 #define GFC_STD_F2018_OBS	(1<<10)	/* Obsolescent in F2018.  */
 #define GFC_STD_F2018		(1<<9)	/* New in F2018.  */
@@ -45,6 +46,7 @@  along with GCC; see the file COPYING3.  If not see
 #define GFC_STD_OPT_F08		(GFC_STD_OPT_F03 | GFC_STD_F2008)
 #define GFC_STD_OPT_F18		((GFC_STD_OPT_F08 | GFC_STD_F2018) \
 				& (~GFC_STD_F2018_DEL))
+#define GFC_STD_OPT_F23		(GFC_STD_OPT_F18 | GFC_STD_F2023)
 
 /* Bitmasks for the various FPE that can be enabled.  These need to be straight integers
    e.g., 8 instead of (1<<3), because they will be included in Fortran source.  */
diff --git a/gcc/fortran/options.cc b/gcc/fortran/options.cc
index cfb195756a8..ffdc32769f1 100644
--- a/gcc/fortran/options.cc
+++ b/gcc/fortran/options.cc
@@ -57,7 +57,7 @@  set_default_std_flags (void)
   gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
     | GFC_STD_F2003 | GFC_STD_F2008 | GFC_STD_F95 | GFC_STD_F77
     | GFC_STD_F2008_OBS | GFC_STD_GNU | GFC_STD_LEGACY
-    | GFC_STD_F2018 | GFC_STD_F2018_DEL | GFC_STD_F2018_OBS;
+    | GFC_STD_F2018 | GFC_STD_F2018_DEL | GFC_STD_F2018_OBS | GFC_STD_F2023;
   gfc_option.warn_std = GFC_STD_F2018_DEL | GFC_STD_F95_DEL | GFC_STD_LEGACY;
 }
 
@@ -144,7 +144,7 @@  gfc_init_options (unsigned int decoded_options_count,
   gfc_option.module_dir = NULL;
   gfc_option.source_form = FORM_UNKNOWN;
   gfc_option.max_continue_fixed = 255;
-  gfc_option.max_continue_free = 255;
+  gfc_option.max_continue_free = 1000000;
   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;
   gfc_option.max_errors = 25;
 
@@ -266,6 +266,10 @@  gfc_post_options (const char **pfilename)
 		       cpp_warn_missing_include_dirs, 1);
   gfc_check_include_dirs (verbose_missing_dir_warn);
 
+  SET_OPTION_IF_UNSET (&global_options, &global_options_set,
+		       flag_free_line_length,
+		       (gfc_option.allow_std & GFC_STD_F2023) ? 10000 : 132);
+
   /* Finalize DEC flags.  */
   post_dec_flags (flag_dec);
 
@@ -769,6 +773,7 @@  gfc_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
     case OPT_std_f2003:
       gfc_option.allow_std = GFC_STD_OPT_F03;
       gfc_option.warn_std = GFC_STD_F95_OBS;
+      gfc_option.max_continue_free = 255;
       gfc_option.max_identifier_length = 63;
       warn_ampersand = 1;
       warn_tabs = 1;
@@ -777,6 +782,7 @@  gfc_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
     case OPT_std_f2008:
       gfc_option.allow_std = GFC_STD_OPT_F08;
       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS;
+      gfc_option.max_continue_free = 255;
       gfc_option.max_identifier_length = 63;
       warn_ampersand = 1;
       warn_tabs = 1;
@@ -785,6 +791,16 @@  gfc_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
     case OPT_std_f2008ts:
     case OPT_std_f2018:
       gfc_option.allow_std = GFC_STD_OPT_F18;
+      gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS
+	| GFC_STD_F2018_OBS;
+      gfc_option.max_continue_free = 255;
+      gfc_option.max_identifier_length = 63;
+      warn_ampersand = 1;
+      warn_tabs = 1;
+      break;
+
+    case OPT_std_f2023:
+      gfc_option.allow_std = GFC_STD_OPT_F23;
       gfc_option.warn_std = GFC_STD_F95_OBS | GFC_STD_F2008_OBS
 	| GFC_STD_F2018_OBS;
       gfc_option.max_identifier_length = 63;
diff --git a/gcc/testsuite/gfortran.dg/continuation_5.f90 b/gcc/testsuite/gfortran.dg/continuation_5.f90
new file mode 100644
index 00000000000..646c27c6dc6
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/continuation_5.f90
@@ -0,0 +1,267 @@ 
+! { dg-do compile }
+! { dg-options -std=f2018 }
+!
+! copied from continuation_4.f90 - but use -std=f2018
+! Fortran 2018: Limit is 255  <<< TESTED
+! Fortran 2023: No limit
+!
+! PR 19262  Test limit on line continuations. Test case derived form case in PR
+! by Steve Kargl.  Submitted by Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+print *, &
+       "1" // & !  1  Counting in groups of 40.
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 40
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 80
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 120
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 160
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 200
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 240
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 255
+       "0"      ! { dg-warning "Limit of 255 continuations exceeded" }
+end
diff --git a/gcc/testsuite/gfortran.dg/continuation_6.f90 b/gcc/testsuite/gfortran.dg/continuation_6.f90
new file mode 100644
index 00000000000..28c90613523
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/continuation_6.f90
@@ -0,0 +1,267 @@ 
+! { dg-do compile }
+! { dg-options -std=f2023 }
+!
+! copied from continuation_4.f90 - but use -std=f2023
+! Fortran 2018: Limit is 255
+! Fortran 2023: No limit      <<< TESTED
+!
+! PR 19262  Test limit on line continuations. Test case derived form case in PR
+! by Steve Kargl.  Submitted by Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+print *, &
+       "1" // & !  1  Counting in groups of 40.
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 40
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 80
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 120
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 160
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 200
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 15
+       "6" // & ! 16
+       "7" // & ! 17
+       "8" // & ! 18
+       "9" // & ! 19
+       "0" // & ! 20
+       "1" // & ! 21
+       "2" // & ! 22
+       "3" // & ! 23
+       "4" // & ! 24
+       "5" // & ! 25
+       "6" // & ! 26
+       "7" // & ! 27
+       "8" // & ! 28
+       "9" // & ! 29
+       "0" // & ! 30
+       "1" // & ! 31
+       "2" // & ! 32
+       "3" // & ! 33
+       "4" // & ! 34
+       "5" // & ! 35
+       "6" // & ! 36
+       "7" // & ! 37
+       "8" // & ! 38
+       "9" // & ! 39
+       "0" // & ! 240
+       "1" // & !  1
+       "2" // & !  2
+       "3" // & !  3
+       "4" // & !  4
+       "5" // & !  5
+       "6" // & !  6
+       "7" // & !  7
+       "8" // & !  8
+       "9" // & !  9
+       "0" // & ! 10
+       "1" // & ! 11
+       "2" // & ! 12
+       "3" // & ! 13
+       "4" // & ! 14
+       "5" // & ! 255
+       "0" ! No warning with -std=f2023
+end
diff --git a/gcc/testsuite/gfortran.dg/goacc/warn_truncated.f90 b/gcc/testsuite/gfortran.dg/goacc/warn_truncated.f90
index 15ef3f513ae..101e026701d 100644
--- a/gcc/testsuite/gfortran.dg/goacc/warn_truncated.f90
+++ b/gcc/testsuite/gfortran.dg/goacc/warn_truncated.f90
@@ -1,4 +1,5 @@ 
 ! { dg-do compile }
+! { dg-additional-options "-std=f2018" }
 ! PR fortran/97390
 !
 integer :: tempRbuffer, array, compactHaloInfo, dimsizes, nHaloLayers, gpu_nList_send, gpu_idx_send, gpu_bufferOffset_send, counter
diff --git a/gcc/testsuite/gfortran.dg/gomp/warn_truncated.f90 b/gcc/testsuite/gfortran.dg/gomp/warn_truncated.f90
index 86d7eb27b30..20cd0449b9a 100644
--- a/gcc/testsuite/gfortran.dg/gomp/warn_truncated.f90
+++ b/gcc/testsuite/gfortran.dg/gomp/warn_truncated.f90
@@ -1,4 +1,5 @@ 
 ! { dg-do compile }
+! { dg-additional-options "-std=f2018" }
 !
 ! PR fortran/94709
 !
diff --git a/gcc/testsuite/gfortran.dg/line_length_10.f90 b/gcc/testsuite/gfortran.dg/line_length_10.f90
index 390e9a16358..c244172e162 100644
--- a/gcc/testsuite/gfortran.dg/line_length_10.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_10.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wno-line-truncation" }
+! { dg-options "-std=f2018 -Wno-line-truncation" }
 !
 ! By default, for free-form source code: Error out
 ! But due to the explicit -Wno-line-truncation, compile w/o warning
diff --git a/gcc/testsuite/gfortran.dg/line_length_11.f90 b/gcc/testsuite/gfortran.dg/line_length_11.f90
index 67f1e29a0eb..2125f5458ea 100644
--- a/gcc/testsuite/gfortran.dg/line_length_11.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_11.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wno-all" }
+! { dg-options "-Wno-all -std=f2018" }
 !
 ! By default, for free-form source code: Error out
 ! But due to the explicit -Wno-all, compile w/o warning
diff --git a/gcc/testsuite/gfortran.dg/line_length_12.f90 b/gcc/testsuite/gfortran.dg/line_length_12.f90
new file mode 100644
index 00000000000..c8a935a027b
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/line_length_12.f90
@@ -0,0 +1,31 @@ 
+! { dg-do compile }
+! { dg-additional-options "-std=f2018" }
+! { dg-prune-output "some warnings being treated as errors" }
+!
+! In Fortran 2018, the linelength is    132 characters.   <<<  Test this.
+! In Fortran 2023, the linelength is 10,000 characters.
+
+implicit none
+integer :: a, b, c, d
+
+a =  & ! The next line has 9,999 characters -> OK
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+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+b =  & ! The next line has 10,000 characters -> OK
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+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+c =  & ! The next line has 10,001 characters -> TOO LONG
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+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+d =  & ! The next line has 10,002 characters -> TOO LONG
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+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+end 
diff --git a/gcc/testsuite/gfortran.dg/line_length_13.f90 b/gcc/testsuite/gfortran.dg/line_length_13.f90
new file mode 100644
index 00000000000..861eeb9c9be
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/line_length_13.f90
@@ -0,0 +1,27 @@ 
+! { dg-do compile }
+! { dg-additional-options "-std=f2023" }
+! { dg-prune-output "some warnings being treated as errors" }
+!
+! In Fortran 2018, the linelength is    132 characters.
+! In Fortran 2023, the linelength is 10,000 characters.   <<<  Test this.
+
+implicit none
+integer :: a, b, c, d
+
+a =  & ! The next line has 9,999 characters -> OK
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+b =  & ! The next line has 10,000 characters -> OK
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+c =  & ! The next line has 10,001 characters -> TOO LONG
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+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+d =  & ! The next line has 10,002 characters -> TOO LONG
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1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 + 42424
+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+end 
diff --git a/gcc/testsuite/gfortran.dg/line_length_14.f90 b/gcc/testsuite/gfortran.dg/line_length_14.f90
new file mode 100644
index 00000000000..c4c66810d7a
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/line_length_14.f90
@@ -0,0 +1,28 @@ 
+! { dg-do compile }
+! { dg-prune-output "some warnings being treated as errors" }
+!
+! Implied -std=gnu
+!
+! In Fortran 2018, the linelength is    132 characters.
+! In Fortran 2023, the linelength is 10,000 characters.   <<<  Test this.
+
+implicit none
+integer :: a, b, c, d
+
+a =  & ! The next line has 9,999 characters -> OK
+   1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3        +4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +    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+
+b =  & ! The next line has 10,000 characters -> OK
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+
+c =  & ! The next line has 10,001 characters -> TOO LONG
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1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 + 4242
+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+d =  & ! The next line has 10,002 characters -> TOO LONG
+   1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3        +4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +    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1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 +       1 +       2 +       3 +       4 +       5 +       6 +       7 +       8 +       9 +      10 + 42424
+
+! { dg-error "Line truncated at .1. \\\[-Werror=line-truncation\\\]" "" { target *-*-* } .-2 }
+
+end 
diff --git a/gcc/testsuite/gfortran.dg/line_length_2.f90 b/gcc/testsuite/gfortran.dg/line_length_2.f90
index e1ab7220d03..ff44d882257 100644
--- a/gcc/testsuite/gfortran.dg/line_length_2.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_2.f90
@@ -1,7 +1,7 @@ 
 ! Testcase for -ffree-line-length-none
 ! See PR fortran/21302
 ! { dg-do compile }
-! { dg-options "-ffree-line-length-none" }
+! { dg-options "-ffree-line-length-none -std=f2018" }
 program two
  if (abs(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa).gt.999.d0.or.abs(bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb).gt.999.d0.or.abs(cccccccccccccccccccc).gt.999.d0) THEN
  endif
diff --git a/gcc/testsuite/gfortran.dg/line_length_5.f90 b/gcc/testsuite/gfortran.dg/line_length_5.f90
index 81832451ea2..ba9f2850b07 100644
--- a/gcc/testsuite/gfortran.dg/line_length_5.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_5.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wline-truncation" }
+! { dg-options "-std=f2018 -Wline-truncation" }
 print *, 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
 end 
 ! { dg-error "Line truncated" " " { target *-*-* } 3 }
diff --git a/gcc/testsuite/gfortran.dg/line_length_6.f90 b/gcc/testsuite/gfortran.dg/line_length_6.f90
index 8cdb0209981..a88e2d247c0 100644
--- a/gcc/testsuite/gfortran.dg/line_length_6.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_6.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "" }
+! { dg-options "-std=f2018" }
 !
 ! By default, for free-form source code: Error out
 !
diff --git a/gcc/testsuite/gfortran.dg/line_length_7.f90 b/gcc/testsuite/gfortran.dg/line_length_7.f90
index b4ebf49c4bf..6c6d73b01c3 100644
--- a/gcc/testsuite/gfortran.dg/line_length_7.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_7.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wno-error" }
+! { dg-options "-std=f2018 -Wno-error" }
 !
 ! By default, for free-form source code: Error out
 ! But due to -Wno-error, we only expect a warning
diff --git a/gcc/testsuite/gfortran.dg/line_length_8.f90 b/gcc/testsuite/gfortran.dg/line_length_8.f90
index afd6cc2df46..822b09e803a 100644
--- a/gcc/testsuite/gfortran.dg/line_length_8.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_8.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wline-truncation" }
+! { dg-options "-std=f2018 -Wline-truncation" }
 !
 ! By default, for free-form source code: Error out
 ! Even with -Wline-truncation, we still get an error
diff --git a/gcc/testsuite/gfortran.dg/line_length_9.f90 b/gcc/testsuite/gfortran.dg/line_length_9.f90
index 6c156afc144..9f07d9a588e 100644
--- a/gcc/testsuite/gfortran.dg/line_length_9.f90
+++ b/gcc/testsuite/gfortran.dg/line_length_9.f90
@@ -1,5 +1,5 @@ 
 ! { dg-do compile }
-! { dg-options "-Wall" }
+! { dg-options "-std=f2018 -Wall" }
 !
 ! By default, for free-form source code: Error out
 ! Even with -Wall, we still get an error