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Fix function declaration protection for glibc already providing them

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On non-glibc based systems we cannot unconditionally use the
__GLIBC_PREREQ macro as it gets expanded before evaluation. Instead,
if it is undefined, define it to 0.

We should also always declare these functions on non-glibc based
systems. And on systems with a new enough glibc, which provides these
functions, we should still provide the declarations if _GNU_SOURCE
is *not* defined.

Reported-by: Jörg Krause <joerg.krause@embedded.rocks>
This commit is contained in:
Guillem Jover
2018-03-06 01:39:45 +01:00
parent b20272f5a9
commit 1f8a3f7bcc
3 changed files with 12 additions and 2 deletions
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3
include/bsd/string.h
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@@ -46,7 +46,8 @@ size_t strlcat(char *dst, const char *src, size_t siz);
char *strnstr(const char *str, const char *find, size_t str_len);
void strmode(mode_t mode, char *str);
#if defined(_GNU_SOURCE) && defined(__GLIBC__) && !__GLIBC_PREREQ(2, 25)
#if !defined(__GLIBC__) || \
(defined(__GLIBC__) && (!__GLIBC_PREREQ(2, 25) || !defined(_GNU_SOURCE)))
void explicit_bzero(void *buf, size_t len);
#endif
__END_DECLS