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From: H.J. Lu <hjl@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] elf: Silence GCC 11/12 false positive warning Date: Fri, 17 Jun 2022 22:18:45 +0000 (GMT) [thread overview] Message-ID: <20220617221845.DCFBA3857B97@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=33ead027586c3371e6765f9070b9564a5ba7e89d commit 33ead027586c3371e6765f9070b9564a5ba7e89d Author: H.J. Lu <hjl.tools@gmail.com> Date: Thu Jun 16 18:52:02 2022 -0700 elf: Silence GCC 11/12 false positive warning Silence GCC 11/12 false positive warning with -mavx512f on dl-load.c: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106008 $ gcc -O2 -fPIC -march=x86-64 -mavx512f -S -Wall ... dl-load.c: In function ‘_dl_map_object_from_fd.constprop’: dl-load.c:1158:30: warning: ‘(((char *)loadcmds.113_68 + _933 + 16))[329406144173384849].mapend’ may be used uninitialized [-Wmaybe-uninitialized] Diff: --- elf/dl-load.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/elf/dl-load.c b/elf/dl-load.c index 2e4a010fc5..1ad0868dad 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1152,10 +1152,20 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, p_align_max = ph->p_align; c->mapoff = ALIGN_DOWN (ph->p_offset, GLRO(dl_pagesize)); + DIAG_PUSH_NEEDS_COMMENT; + +#if __GNUC_PREREQ (11, 0) + /* Suppress invalid GCC warning: + ‘(((char *)loadcmds.113_68 + _933 + 16))[329406144173384849].mapend’ may be used uninitialized [-Wmaybe-uninitialized] + See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106008 + */ + DIAG_IGNORE_NEEDS_COMMENT (11, "-Wmaybe-uninitialized"); +#endif /* Determine whether there is a gap between the last segment and this one. */ if (nloadcmds > 1 && c[-1].mapend != c->mapstart) has_holes = true; + DIAG_POP_NEEDS_COMMENT; /* Optimize a common case. */ #if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7
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