This patch is from upstream glibc after 2.33 and is needed in Guix to fix glibc-2.33 compilation for riscv64-linux. From 044e603b698093cf48f6e6229e0b66acf05227e4 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Fri, 19 Feb 2021 13:29:00 +0100 Subject: [PATCH] string: Work around GCC PR 98512 in rawmemchr --- string/rawmemchr.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/string/rawmemchr.c b/string/rawmemchr.c index 59bbeeaa42..b8523118e5 100644 --- a/string/rawmemchr.c +++ b/string/rawmemchr.c @@ -22,24 +22,28 @@ # define RAWMEMCHR __rawmemchr #endif +/* The pragmata should be nested inside RAWMEMCHR below, but that + triggers GCC PR 98512. */ +DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) +/* GCC 8 warns about the size passed to memchr being larger than + PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */ +DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow="); +#endif +#if __GNUC_PREREQ (11, 0) +/* Likewise GCC 11, with a different warning option. */ +DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread"); +#endif + /* Find the first occurrence of C in S. */ void * RAWMEMCHR (const void *s, int c) { - DIAG_PUSH_NEEDS_COMMENT; -#if __GNUC_PREREQ (7, 0) - /* GCC 8 warns about the size passed to memchr being larger than - PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */ - DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow="); -#endif -#if __GNUC_PREREQ (11, 0) - /* Likewise GCC 11, with a different warning option. */ - DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread"); -#endif if (c != '\0') return memchr (s, c, (size_t)-1); - DIAG_POP_NEEDS_COMMENT; return (char *)s + strlen (s); } libc_hidden_def (__rawmemchr) weak_alias (__rawmemchr, rawmemchr) + +DIAG_POP_NEEDS_COMMENT; --