https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117289
--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Joseph Myers <js...@gcc.gnu.org>: https://gcc.gnu.org/g:55e3bd376b2214e200fa76d12b67ff259b06c212 commit r15-5327-g55e3bd376b2214e200fa76d12b67ff259b06c212 Author: Joseph Myers <josmy...@redhat.com> Date: Fri Nov 15 23:42:59 2024 +0000 c: Default to -std=gnu23 Change the default language version for C compilation from -std=gnu17 to -std=gnu23. A few tests are updated to remove local definitions of bool, true and false (where making such an unconditional test change seemed to make more sense than changing the test conditionally earlier or building it with -std=gnu17); most test issues were already addressed in previous patches. In the case of ctf-function-pointers-2.c, it was agreed in bug 117289 that it would be OK to put -std=gnu17 in the test and leave more optimal BTF / CTF output for this test as a potential future improvement. Since the original test fixes, more such fixes have become necessary and so are included in this patch. More noinline attributes are added to simulate-thread tests where () meaning a prototype affected test results, while gcc.dg/torture/pr117496-1.c (a test declaring a function with () then calling it with arguments) gets -std=gnu17 added. Bootstrapped with no regressions for x86_64-pc-linux-gnu. NOTE: it's likely there are target-specific tests for non-x86 targets that need updating as a result of this change. See commit 9fb5348e3021021e82d75e4ca4e6f8d51a34c24f ("testsuite: Prepare for -std=gnu23 default") for examples of changes to prepare the testsuite to work with a -std=gnu23 default. In most cases, adding -Wno-old-style-definition (for warnings for old-style function definitions) or -std=gnu17 (for other issues such as unprototyped function declarations with ()) is appropriate, but watch out for cases that indicate bugs with -std=gnu23 (in particular, any ICEs - there was only the one nested function test where I had to fix an ICE on x86_64). gcc/ * doc/invoke.texi (-std=gnu17, -std=gnu23): Document -std=gnu23 as default for C code. gcc/c-family/ * c-opts.cc (c_common_init_options): Default to C23. gcc/testsuite/ * c-c++-common/analyzer/asm-x86-dyndbg-2.c, c-c++-common/analyzer/asm-x86-lp64-2.c, c-c++-common/analyzer/attr-malloc-CVE-2019-19078-usb-leak.c, c-c++-common/analyzer/coreutils-cksum-pr108664.c, c-c++-common/analyzer/feasibility-3.c, c-c++-common/analyzer/pr105783.c, c-c++-common/analyzer/sock-1.c, c-c++-common/attributes-4.c, gcc.dg/Warray-bounds-78.c, gcc.dg/analyzer/asm-x86-dyndbg-1.c: Do not define bool, true or false. * gcc.dg/debug/ctf/ctf-function-pointers-2.c: Use -std-gnu17. * gcc.dg/gnu23-version-2.c: New test. * gcc.dg/simulate-thread/atomic-load-int.c, gcc.dg/simulate-thread/atomic-load-longlong.c, gcc.dg/simulate-thread/atomic-load-short.c: Add more noinline attributes. * gcc.dg/torture/pr117496-1.c: Use -std=gnu17.
