include/stdlib.h: only expose reallocarray() prototype when implementation is availableHEADmaster

The reallocarray() primitive is only provided by the malloc-standard
implementation: neither malloc nor malloc-simple provide it. This
causes issues when building for example util-linux on noMMU platforms
as:

- noMMU platforms can't use malloc-standard, so either malloc or
  malloc-simple are used, which means reallocarray() is not
  implemented

- util-linux detects the absence of reallocarray(), and provides its
  own implementation, but the prototype clashes with the prototype in
  uClibc's <stdlib.h>

The combination of which causes the following build failure:

In file included from lib/color-names.c:7:
./include/c.h:586:21: error: static declaration of ‘reallocarray’ follows non-static declaration
  586 | static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
      |                     ^~~~~~~~~~~~
In file included from ./include/c.h:16:
/home/thomas/projets/buildroot/output/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/include/stdlib.h:898:14: note: previous declaration of ‘reallocarray’ with type ‘void *(void *, size_t,  size_t)’ {aka ‘void *(void *, unsigned int,  unsigned int)’}
  898 | extern void *reallocarray (void *__ptr, size_t __m, size_t __n);
      |              ^~~~~~~~~~~~
make[3]: *** [Makefile:12354: lib/libtcolors_la-color-names.lo] Error 1

To fix this, let's not expose the prototype of reallocarray() if we
don't provide the implementation for it.

Upstream: https://mailman.openadk.org/mailman3/hyperkitty/list/devel@uclibc-ng.org/thread/BX4ENNZYO23YQJQF5XITW7TETSJHEFK5/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

0 files changed, 0 insertions, 0 deletions