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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/stdlib.h
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@@ -71,7 +71,8 @@ int sradixsort(const unsigned char **base, int nmemb,
const unsigned char *table, unsigned endbyte);
void *reallocf(void *ptr, size_t size);
#if defined(_GNU_SOURCE) && defined(__GLIBC__) && !__GLIBC_PREREQ(2, 26)
#if !defined(__GLIBC__) || \
(defined(__GLIBC__) && (!__GLIBC_PREREQ(2, 26) || !defined(_GNU_SOURCE)))
void *reallocarray(void *ptr, size_t nmemb, size_t size);
#endif