diff mbox series

[3/5] tools lib subcmd: Add dependency test to install_headers

Message ID 20221202045743.2639466-4-irogers@google.com
State New
Headers
Series Improvements to incremental builds |

Commit Message

Ian Rogers Dec. 2, 2022, 4:57 a.m. UTC 
  Compute the headers to be installed from their source headers and make
each have its own build target to install it. Using dependencies
avoids headers being reinstalled and getting a new timestamp which
then causes files that depend on the header to be rebuilt.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/lib/subcmd/Makefile | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

Comments

Nicolas Schier Dec. 12, 2022, 8:57 p.m. UTC | #1 
On Thu, Dec 01, 2022 at 08:57:41PM -0800 Ian Rogers wrote:
> Compute the headers to be installed from their source headers and make
> each have its own build target to install it. Using dependencies
> avoids headers being reinstalled and getting a new timestamp which
> then causes files that depend on the header to be rebuilt.
> 
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  tools/lib/subcmd/Makefile | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
> index 9a316d8b89df..b87213263a5e 100644
> --- a/tools/lib/subcmd/Makefile
> +++ b/tools/lib/subcmd/Makefile
> @@ -89,10 +89,10 @@ define do_install_mkdir
>  endef
>  
>  define do_install
> -	if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
> -		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
> +	if [ ! -d '$2' ]; then             \
> +		$(INSTALL) -d -m 755 '$2'; \
>  	fi;                                             \
> -	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
> +	$(INSTALL) $1 $(if $3,-m $3,) '$2'

What about using '$(INSTALL) -D ...' instead of the if-mkdir-block above?
(E.g. as in tools/debugging/Makefile.)

Kind regards,
Nicolas

>  endef
>  
>  install_lib: $(LIBFILE)
> @@ -100,13 +100,16 @@ install_lib: $(LIBFILE)
>  		$(call do_install_mkdir,$(libdir_SQ)); \
>  		cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
>  
> -install_headers:
> -	$(call QUIET_INSTALL, libsubcmd_headers) \
> -		$(call do_install,exec-cmd.h,$(prefix)/include/subcmd,644); \
> -		$(call do_install,help.h,$(prefix)/include/subcmd,644); \
> -		$(call do_install,pager.h,$(prefix)/include/subcmd,644); \
> -		$(call do_install,parse-options.h,$(prefix)/include/subcmd,644); \
> -		$(call do_install,run-command.h,$(prefix)/include/subcmd,644);
> +HDRS := exec-cmd.h help.h pager.h parse-options.h run-command.h
> +INSTALL_HDRS_PFX := $(DESTDIR)$(prefix)/include/subcmd
> +INSTALL_HDRS := $(addprefix $(INSTALL_HDRS_PFX)/, $(HDRS))
> +
> +$(INSTALL_HDRS): $(INSTALL_HDRS_PFX)/%.h: %.h
> +	$(call QUIET_INSTALL, $@) \
> +		$(call do_install,$<,$(INSTALL_HDRS_PFX)/,644)
> +
> +install_headers: $(INSTALL_HDRS)
> +	$(call QUIET_INSTALL, libsubcmd_headers)
>  
>  install: install_lib install_headers
>  
> -- 
> 2.39.0.rc0.267.gcb52ba06e7-goog
Ian Rogers Dec. 13, 2022, 9:28 p.m. UTC | #2 
On Mon, Dec 12, 2022 at 12:57 PM Nicolas Schier <nicolas@fjasle.eu> wrote:
>
> On Thu, Dec 01, 2022 at 08:57:41PM -0800 Ian Rogers wrote:
> > Compute the headers to be installed from their source headers and make
> > each have its own build target to install it. Using dependencies
> > avoids headers being reinstalled and getting a new timestamp which
> > then causes files that depend on the header to be rebuilt.
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
> > ---
> >  tools/lib/subcmd/Makefile | 23 +++++++++++++----------
> >  1 file changed, 13 insertions(+), 10 deletions(-)
> >
> > diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
> > index 9a316d8b89df..b87213263a5e 100644
> > --- a/tools/lib/subcmd/Makefile
> > +++ b/tools/lib/subcmd/Makefile
> > @@ -89,10 +89,10 @@ define do_install_mkdir
> >  endef
> >
> >  define do_install
> > -     if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
> > -             $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
> > +     if [ ! -d '$2' ]; then             \
> > +             $(INSTALL) -d -m 755 '$2'; \
> >       fi;                                             \
> > -     $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
> > +     $(INSTALL) $1 $(if $3,-m $3,) '$2'
>
> What about using '$(INSTALL) -D ...' instead of the if-mkdir-block above?
> (E.g. as in tools/debugging/Makefile.)
>
> Kind regards,
> Nicolas

Thanks Nicolas, the reason was to keep the code consistent. That's not
to say this is the best approach. For example, here is the same thing
for tools/lib/api:
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/lib/api/Makefile?h=perf/core&id=f43368371888694a2eceaaad8f5e9775c092009a#n84

If you'd like to improve this in all the versions and send patches I'd
be happy to take a look.

Thanks,
Ian

> >  endef
> >
> >  install_lib: $(LIBFILE)
> > @@ -100,13 +100,16 @@ install_lib: $(LIBFILE)
> >               $(call do_install_mkdir,$(libdir_SQ)); \
> >               cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
> >
> > -install_headers:
> > -     $(call QUIET_INSTALL, libsubcmd_headers) \
> > -             $(call do_install,exec-cmd.h,$(prefix)/include/subcmd,644); \
> > -             $(call do_install,help.h,$(prefix)/include/subcmd,644); \
> > -             $(call do_install,pager.h,$(prefix)/include/subcmd,644); \
> > -             $(call do_install,parse-options.h,$(prefix)/include/subcmd,644); \
> > -             $(call do_install,run-command.h,$(prefix)/include/subcmd,644);
> > +HDRS := exec-cmd.h help.h pager.h parse-options.h run-command.h
> > +INSTALL_HDRS_PFX := $(DESTDIR)$(prefix)/include/subcmd
> > +INSTALL_HDRS := $(addprefix $(INSTALL_HDRS_PFX)/, $(HDRS))
> > +
> > +$(INSTALL_HDRS): $(INSTALL_HDRS_PFX)/%.h: %.h
> > +     $(call QUIET_INSTALL, $@) \
> > +             $(call do_install,$<,$(INSTALL_HDRS_PFX)/,644)
> > +
> > +install_headers: $(INSTALL_HDRS)
> > +     $(call QUIET_INSTALL, libsubcmd_headers)
> >
> >  install: install_lib install_headers
> >
> > --
> > 2.39.0.rc0.267.gcb52ba06e7-goog
>
> --
> epost|xmpp: nicolas@fjasle.eu          irc://oftc.net/nsc
> ↳ gpg: 18ed 52db e34f 860e e9fb  c82b 7d97 0932 55a0 ce7f
>      -- frykten for herren er opphav til kunnskap --
Nicolas Schier Dec. 19, 2022, 2:44 p.m. UTC | #3 
On Tue 13 Dec 2022 13:28:21 GMT, Ian Rogers wrote:
> On Mon, Dec 12, 2022 at 12:57 PM Nicolas Schier <nicolas@fjasle.eu> wrote:
> >
> > On Thu, Dec 01, 2022 at 08:57:41PM -0800 Ian Rogers wrote:
> > > Compute the headers to be installed from their source headers and make
> > > each have its own build target to install it. Using dependencies
> > > avoids headers being reinstalled and getting a new timestamp which
> > > then causes files that depend on the header to be rebuilt.
> > >
> > > Signed-off-by: Ian Rogers <irogers@google.com>
> > > ---
> > >  tools/lib/subcmd/Makefile | 23 +++++++++++++----------
> > >  1 file changed, 13 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
> > > index 9a316d8b89df..b87213263a5e 100644
> > > --- a/tools/lib/subcmd/Makefile
> > > +++ b/tools/lib/subcmd/Makefile
> > > @@ -89,10 +89,10 @@ define do_install_mkdir
> > >  endef
> > >
> > >  define do_install
> > > -     if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
> > > -             $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
> > > +     if [ ! -d '$2' ]; then             \
> > > +             $(INSTALL) -d -m 755 '$2'; \
> > >       fi;                                             \
> > > -     $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
> > > +     $(INSTALL) $1 $(if $3,-m $3,) '$2'
> >
> > What about using '$(INSTALL) -D ...' instead of the if-mkdir-block above?
> > (E.g. as in tools/debugging/Makefile.)
> >
> > Kind regards,
> > Nicolas
> 
> Thanks Nicolas, the reason was to keep the code consistent. That's not
> to say this is the best approach. For example, here is the same thing
> for tools/lib/api:
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/lib/api/Makefile?h=perf/core&id=f43368371888694a2eceaaad8f5e9775c092009a#n84
> 
> If you'd like to improve this in all the versions and send patches I'd
> be happy to take a look.
> 
> Thanks,
> Ian

Ian, while watching at tools/lib/*/Makefile I stumple across the 
special single-quote handling (e.g. 'DESTDIR_SQ') several times.  

Top-level Makefile and kbuild are not designed to work with file or 
directory names containing spaces.  Do you know whether this is needed 
for the installation rules in tools/lib/?  I'd like to remove support 
for path names with spaces for a increasing simplicity and consistency.

Kind regards,
Nicolas
diff mbox series

Patch

diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
index 9a316d8b89df..b87213263a5e 100644
--- a/tools/lib/subcmd/Makefile
+++ b/tools/lib/subcmd/Makefile
@@ -89,10 +89,10 @@  define do_install_mkdir
 endef
 
 define do_install
-	if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
-		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
+	if [ ! -d '$2' ]; then             \
+		$(INSTALL) -d -m 755 '$2'; \
 	fi;                                             \
-	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+	$(INSTALL) $1 $(if $3,-m $3,) '$2'
 endef
 
 install_lib: $(LIBFILE)
@@ -100,13 +100,16 @@  install_lib: $(LIBFILE)
 		$(call do_install_mkdir,$(libdir_SQ)); \
 		cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
 
-install_headers:
-	$(call QUIET_INSTALL, libsubcmd_headers) \
-		$(call do_install,exec-cmd.h,$(prefix)/include/subcmd,644); \
-		$(call do_install,help.h,$(prefix)/include/subcmd,644); \
-		$(call do_install,pager.h,$(prefix)/include/subcmd,644); \
-		$(call do_install,parse-options.h,$(prefix)/include/subcmd,644); \
-		$(call do_install,run-command.h,$(prefix)/include/subcmd,644);
+HDRS := exec-cmd.h help.h pager.h parse-options.h run-command.h
+INSTALL_HDRS_PFX := $(DESTDIR)$(prefix)/include/subcmd
+INSTALL_HDRS := $(addprefix $(INSTALL_HDRS_PFX)/, $(HDRS))
+
+$(INSTALL_HDRS): $(INSTALL_HDRS_PFX)/%.h: %.h
+	$(call QUIET_INSTALL, $@) \
+		$(call do_install,$<,$(INSTALL_HDRS_PFX)/,644)
+
+install_headers: $(INSTALL_HDRS)
+	$(call QUIET_INSTALL, libsubcmd_headers)
 
 install: install_lib install_headers