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Mon, 13 Nov 2023 13:09:44 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 332302026D4C for ; Mon, 13 Nov 2023 13:09:43 +0000 (UTC) From: Florian Weimer To: gcc-patches@gcc.gnu.org Subject: [PATCH 0/6] Turn some C warnings into errors by default Message-ID: X-From-Line: 212c5e6a96543257d45471b92a8c4e994ff33151 Mon Sep 17 00:00:00 2001 Date: Mon, 13 Nov 2023 14:09:42 +0100 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1782454444104186328 X-GMAIL-MSGID: 1782454444104186328 This patch series converts the following warnings into errors by default: -Wint-conversion -Wimplicit-function-declaration -Wimplicit-int -Wreturn-mismatch -Wincompatible-pointer-types As explained in the first commit, I decided not to use permerror_opt because it does not exhibit the existing behavior for -pedantic-errors. The impact on existing sources of the last commit is not really known to me at this point. I plan to start a Fedora build later this week with an instrumented compiler, to see how much of a compatible impact it will be. The first conversion pass through Fedora only covered -Wimplicit-function-declaration, -Wimplicit-int. I started looking at -Wint-conversion, and it did not seem to be too bad, so I think including it should be fine. I'm more worried about -Wincompatible-pointer-types. I have not yet added a new overview test for -fpermissive. Such a test should trigger all the dozen or so places where I introduced pedpermerror, and see what happens under multiple dialects, each with -fpermissive and without, and maybe also with and withoyt for -pedantic-errors in -std=gnu89 and default modes. I plan to do this once I get some initial feedback on the direction of these series because this test would likely be obsolete fairly quickly if changes to the diagnostics are required. I did copy some existing tests to test both the error and warning (-fpermissive) diagnostics, and adjusted others to expect errors, so there is already quite a bit coverage without that overview test. Right now, this series breaks the build on aarch64-linux-gnu due to an incompatible pointer assignment in libgcc: [PATCH] aarch64: Avoid -Wincompatible-pointer-types warning in Linux unwinder Other targets had the same issue previously, but I've already fixed most of them (I hope). There could of course be similar issues lurking in target-specific code, or even in system headers. With the recent testsuite fixes, the testsuite should be fairly clean despite these changes. I verified that on i686-linux-gnu, powerpc64-linux-gnu, and x86_64-linux-gnu. There is one aarch64-linux-gnu testsuite change I'd like the AArch64 maintainers to review: [PATCH] aarch64: Call named function in gcc.target/aarch64/aapcs64/ice_1.c Recently, I also found a problem in the gm2 testsuite: [PATCH] gm2: Add missing declaration of m2pim_M2RTS_Terminate to test Thanks, Florian Florian Weimer (6): c-family: Introduce pedpermerror c: Turn int-conversion warnings into permerrors c: Turn -Wimplicit-function-declaration into a pedpermerror c: Turn -Wimplicit-int into a pedpermerror c: Turn -Wreturn-mismatch into a pedpermerror c: Turn -Wincompatible-pointer-types into a pedpermerror gcc/c-family/c-common.h | 4 + gcc/c-family/c-warn.cc | 34 ++++ gcc/c/c-decl.cc | 40 ++-- gcc/c/c-typeck.cc | 164 +++++++++------ gcc/diagnostic-core.h | 3 + gcc/diagnostic.cc | 7 + gcc/doc/invoke.texi | 33 +++- gcc/testsuite/c-c++-common/pr77624-1.c | 4 +- .../c-c++-common/spellcheck-reserved.c | 4 +- gcc/testsuite/gcc.dg/20030906-1.c | 2 +- gcc/testsuite/gcc.dg/20030906-1a.c | 21 ++ gcc/testsuite/gcc.dg/20030906-2.c | 2 +- gcc/testsuite/gcc.dg/20030906-2a.c | 21 ++ .../Wimplicit-function-declaration-c99-2.c | 7 + .../Wimplicit-function-declaration-c99.c | 2 +- gcc/testsuite/gcc.dg/Wimplicit-int-1.c | 2 +- gcc/testsuite/gcc.dg/Wimplicit-int-1a.c | 11 ++ gcc/testsuite/gcc.dg/Wimplicit-int-4.c | 2 +- gcc/testsuite/gcc.dg/Wimplicit-int-4a.c | 11 ++ .../gcc.dg/Wincompatible-pointer-types-2.c | 2 +- .../gcc.dg/Wincompatible-pointer-types-4.c | 2 +- .../gcc.dg/Wincompatible-pointer-types-5.c | 10 + .../gcc.dg/Wincompatible-pointer-types-6.c | 10 + gcc/testsuite/gcc.dg/Wint-conversion-2.c | 2 +- gcc/testsuite/gcc.dg/Wint-conversion-3.c | 2 +- gcc/testsuite/gcc.dg/Wint-conversion-4.c | 14 ++ gcc/testsuite/gcc.dg/Wreturn-mismatch-1.c | 2 +- gcc/testsuite/gcc.dg/Wreturn-mismatch-1a.c | 40 ++++ gcc/testsuite/gcc.dg/Wreturn-mismatch-2.c | 2 +- gcc/testsuite/gcc.dg/Wreturn-mismatch-2a.c | 41 ++++ gcc/testsuite/gcc.dg/anon-struct-11.c | 5 +- gcc/testsuite/gcc.dg/anon-struct-11a.c | 111 +++++++++++ gcc/testsuite/gcc.dg/anon-struct-13.c | 2 +- gcc/testsuite/gcc.dg/anon-struct-13a.c | 76 +++++++ gcc/testsuite/gcc.dg/assign-warn-1.c | 2 +- gcc/testsuite/gcc.dg/assign-warn-4.c | 21 ++ .../gcc.dg/builtin-arith-overflow-4.c | 2 +- .../gcc.dg/builtin-arith-overflow-4a.c | 43 ++++ gcc/testsuite/gcc.dg/c23-qual-4.c | 6 +- gcc/testsuite/gcc.dg/dfp/composite-type-2.c | 58 ++++++ gcc/testsuite/gcc.dg/dfp/composite-type.c | 2 +- gcc/testsuite/gcc.dg/diag-aka-1.c | 2 +- gcc/testsuite/gcc.dg/diag-aka-1a.c | 29 +++ .../gcc.dg/diagnostic-range-bad-return-2.c | 52 +++++ .../gcc.dg/diagnostic-range-bad-return.c | 2 +- gcc/testsuite/gcc.dg/diagnostic-types-1.c | 2 +- gcc/testsuite/gcc.dg/diagnostic-types-2.c | 24 +++ gcc/testsuite/gcc.dg/enum-compat-1.c | 2 +- gcc/testsuite/gcc.dg/enum-compat-2.c | 32 +++ gcc/testsuite/gcc.dg/func-ptr-conv-1.c | 2 +- gcc/testsuite/gcc.dg/func-ptr-conv-2.c | 56 ++++++ gcc/testsuite/gcc.dg/gnu23-attr-syntax-2.c | 2 +- gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c | 17 ++ gcc/testsuite/gcc.dg/gomp/pr35738-2.c | 18 ++ gcc/testsuite/gcc.dg/gomp/pr35738.c | 2 +- gcc/testsuite/gcc.dg/init-bad-7.c | 2 +- gcc/testsuite/gcc.dg/init-bad-7a.c | 12 ++ gcc/testsuite/gcc.dg/init-excess-3.c | 4 +- gcc/testsuite/gcc.dg/missing-header-fixit-1.c | 2 +- .../gcc.dg/missing-header-fixit-1a.c | 37 ++++ gcc/testsuite/gcc.dg/missing-header-fixit-2.c | 2 +- .../gcc.dg/missing-header-fixit-2a.c | 31 +++ gcc/testsuite/gcc.dg/missing-header-fixit-4.c | 2 +- .../gcc.dg/missing-header-fixit-4a.c | 27 +++ gcc/testsuite/gcc.dg/missing-header-fixit-5.c | 2 +- .../gcc.dg/missing-header-fixit-5a.c | 42 ++++ .../gcc.dg/noncompile/incomplete-3.c | 2 +- gcc/testsuite/gcc.dg/noncompile/pr79758-2.c | 6 + gcc/testsuite/gcc.dg/noncompile/pr79758.c | 1 + gcc/testsuite/gcc.dg/overflow-warn-1.c | 4 +- gcc/testsuite/gcc.dg/overflow-warn-3.c | 4 +- gcc/testsuite/gcc.dg/param-type-mismatch-2.c | 187 ++++++++++++++++++ gcc/testsuite/gcc.dg/param-type-mismatch.c | 2 +- gcc/testsuite/gcc.dg/pointer-array-atomic-2.c | 60 ++++++ gcc/testsuite/gcc.dg/pointer-array-atomic.c | 2 +- gcc/testsuite/gcc.dg/pointer-array-quals-1.c | 6 +- gcc/testsuite/gcc.dg/pr105635-2.c | 11 ++ gcc/testsuite/gcc.dg/pr105635.c | 2 +- gcc/testsuite/gcc.dg/pr23075-2.c | 14 ++ gcc/testsuite/gcc.dg/pr23075.c | 2 +- gcc/testsuite/gcc.dg/pr29521-a.c | 15 ++ gcc/testsuite/gcc.dg/pr29521.c | 2 +- gcc/testsuite/gcc.dg/pr61162-2.c | 2 +- gcc/testsuite/gcc.dg/pr61162-3.c | 13 ++ gcc/testsuite/gcc.dg/pr61852.c | 4 +- gcc/testsuite/gcc.dg/pr67730-a.c | 11 ++ gcc/testsuite/gcc.dg/pr67730.c | 2 +- gcc/testsuite/gcc.dg/spec-barrier-3.c | 2 +- gcc/testsuite/gcc.dg/spec-barrier-3a.c | 13 ++ .../gcc.dg/spellcheck-identifiers-1a.c | 136 +++++++++++++ .../gcc.dg/spellcheck-identifiers-2.c | 2 +- .../gcc.dg/spellcheck-identifiers-2a.c | 33 ++++ .../gcc.dg/spellcheck-identifiers-3.c | 2 +- .../gcc.dg/spellcheck-identifiers-3a.c | 45 +++++ .../gcc.dg/spellcheck-identifiers-4.c | 2 +- .../gcc.dg/spellcheck-identifiers-4a.c | 10 + gcc/testsuite/gcc.dg/spellcheck-identifiers.c | 2 +- gcc/testsuite/gcc.dg/transparent-union-1.c | 2 +- gcc/testsuite/gcc.dg/transparent-union-1a.c | 85 ++++++++ .../gcc.target/aarch64/acle/memtag_2.c | 4 +- .../gcc.target/aarch64/acle/memtag_2a.c | 71 +++++++ .../sve/acle/general-c/ld1sh_gather_1.c | 2 +- .../aarch64/sve/acle/general-c/load_2.c | 4 +- .../aarch64/sve/acle/general-c/load_3.c | 2 +- .../acle/general-c/load_ext_gather_index_1.c | 2 +- .../load_ext_gather_index_restricted_1.c | 2 +- .../acle/general-c/load_ext_gather_offset_1.c | 4 +- .../acle/general-c/load_ext_gather_offset_2.c | 4 +- .../acle/general-c/load_ext_gather_offset_3.c | 4 +- .../acle/general-c/load_ext_gather_offset_4.c | 4 +- .../acle/general-c/load_ext_gather_offset_5.c | 4 +- .../load_ext_gather_offset_restricted_1.c | 4 +- .../load_ext_gather_offset_restricted_2.c | 4 +- .../load_ext_gather_offset_restricted_3.c | 4 +- .../load_ext_gather_offset_restricted_4.c | 4 +- .../aarch64/sve/acle/general-c/sizeless-1.c | 8 +- .../aarch64/sve/acle/general-c/sizeless-2.c | 8 +- .../aarch64/sve/acle/general-c/store_1.c | 8 +- .../aarch64/sve/acle/general-c/store_2.c | 10 +- .../acle/general-c/store_scatter_index_1.c | 8 +- .../store_scatter_index_restricted_1.c | 8 +- .../acle/general-c/store_scatter_offset_2.c | 8 +- .../store_scatter_offset_restricted_1.c | 8 +- .../aarch64/sve/acle/general/attributes_7.c | 28 +-- .../i386/sse2-bfloat16-scalar-typecheck.c | 4 +- .../i386/vect-bfloat16-typecheck_1.c | 4 +- .../i386/vect-bfloat16-typecheck_2.c | 4 +- .../gcc.target/powerpc/conditional-return.c | 2 +- 128 files changed, 1920 insertions(+), 231 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/20030906-1a.c create mode 100644 gcc/testsuite/gcc.dg/20030906-2a.c create mode 100644 gcc/testsuite/gcc.dg/Wimplicit-function-declaration-c99-2.c create mode 100644 gcc/testsuite/gcc.dg/Wimplicit-int-1a.c create mode 100644 gcc/testsuite/gcc.dg/Wimplicit-int-4a.c create mode 100644 gcc/testsuite/gcc.dg/Wincompatible-pointer-types-5.c create mode 100644 gcc/testsuite/gcc.dg/Wincompatible-pointer-types-6.c create mode 100644 gcc/testsuite/gcc.dg/Wint-conversion-4.c create mode 100644 gcc/testsuite/gcc.dg/Wreturn-mismatch-1a.c create mode 100644 gcc/testsuite/gcc.dg/Wreturn-mismatch-2a.c create mode 100644 gcc/testsuite/gcc.dg/anon-struct-11a.c create mode 100644 gcc/testsuite/gcc.dg/anon-struct-13a.c create mode 100644 gcc/testsuite/gcc.dg/assign-warn-4.c create mode 100644 gcc/testsuite/gcc.dg/builtin-arith-overflow-4a.c create mode 100644 gcc/testsuite/gcc.dg/dfp/composite-type-2.c create mode 100644 gcc/testsuite/gcc.dg/diag-aka-1a.c create mode 100644 gcc/testsuite/gcc.dg/diagnostic-range-bad-return-2.c create mode 100644 gcc/testsuite/gcc.dg/diagnostic-types-2.c create mode 100644 gcc/testsuite/gcc.dg/enum-compat-2.c create mode 100644 gcc/testsuite/gcc.dg/func-ptr-conv-2.c create mode 100644 gcc/testsuite/gcc.dg/gnu23-attr-syntax-3.c create mode 100644 gcc/testsuite/gcc.dg/gomp/pr35738-2.c create mode 100644 gcc/testsuite/gcc.dg/init-bad-7a.c create mode 100644 gcc/testsuite/gcc.dg/missing-header-fixit-1a.c create mode 100644 gcc/testsuite/gcc.dg/missing-header-fixit-2a.c create mode 100644 gcc/testsuite/gcc.dg/missing-header-fixit-4a.c create mode 100644 gcc/testsuite/gcc.dg/missing-header-fixit-5a.c create mode 100644 gcc/testsuite/gcc.dg/noncompile/pr79758-2.c create mode 100644 gcc/testsuite/gcc.dg/param-type-mismatch-2.c create mode 100644 gcc/testsuite/gcc.dg/pointer-array-atomic-2.c create mode 100644 gcc/testsuite/gcc.dg/pr105635-2.c create mode 100644 gcc/testsuite/gcc.dg/pr23075-2.c create mode 100644 gcc/testsuite/gcc.dg/pr29521-a.c create mode 100644 gcc/testsuite/gcc.dg/pr61162-3.c create mode 100644 gcc/testsuite/gcc.dg/pr67730-a.c create mode 100644 gcc/testsuite/gcc.dg/spec-barrier-3a.c create mode 100644 gcc/testsuite/gcc.dg/spellcheck-identifiers-1a.c create mode 100644 gcc/testsuite/gcc.dg/spellcheck-identifiers-2a.c create mode 100644 gcc/testsuite/gcc.dg/spellcheck-identifiers-3a.c create mode 100644 gcc/testsuite/gcc.dg/spellcheck-identifiers-4a.c create mode 100644 gcc/testsuite/gcc.dg/transparent-union-1a.c create mode 100644 gcc/testsuite/gcc.target/aarch64/acle/memtag_2a.c base-commit: b51bfee1beed03872ea0289cb47dd2336d9f528c prerequisite-patch-id: f46d6a56470ab459865ba2e45372d60e131b9ee2 prerequisite-patch-id: 7e0b407ec2bbd5e3b9c7ed1342b08d3677a65283 prerequisite-patch-id: 02e95117add6ada9d5cdb489399fb2e562db76e2