[PATCH] Also prototype strdup(),strndup() iif _XOPEN_SOURCE is defined appropriately

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

I'm not sure if this is wanted, but for completeness:  The SUSv2 function
strdup() and SUSv4 function strndup() are only declared if __STRICT_ANSI__ is
defined.

Attached is a patch to also prototype those functions if _XOPEN_SOURCE is
defined appropriately.

$ cat xopen-strdup-test.c
#include <string.h>

int main()
{
  strdup("this");
  strndup("this",1);
}

before patch:

$ gcc xopen-strdup-test.c -std=c99 -Werror=implicit-function-declaration
xopen-strdup-test.c: In function ‘main’:
xopen-strdup-test.c:8:3: error: implicit declaration of function ‘strdup’
xopen-strdup-test.c:9:3: error: implicit declaration of function ‘strndup’

after patch:

$ gcc xopen-strdup-test.c -std=c99 -Werror=implicit-function-declaration
xopen-strdup-test.c: In function ‘main’:
xopen-strdup-test.c:8:3: error: implicit declaration of function ‘strdup’
xopen-strdup-test.c:9:3: error: implicit declaration of function ‘strndup’

$ gcc xopen-strdup-test.c -std=c99 -Werror=implicit-function-declaration
-D_XOPEN_SOURCE=500
xopen-strdup-test.c: In function ‘main’:
xopen-strdup-test.c:9:3: error: implicit declaration of function ‘strndup’

$ gcc xopen-strdup-test.c -std=c99 -Werror=implicit-function-declaration
-D_XOPEN_SOURCE=700

newlib/ChangeLog:

2012-10-22  Jon TURNEY  <jon.turney@dronecode.org.uk>

	* libc/include/string.h (strdup, strndup): Declare if not
	__STRICT_ANSI__ or _XOPEN_SOURCE is defined appropriately.

Attachment: string.h.patch
Description: Text document