[gcc r14-9513] testsuite: Define _POSIX_C_SOURCE for test

[gcc r14-9513] testsuite: Define _POSIX_C_SOURCE for test

[Torbjorn Svensson]

https://gcc.gnu.org/g:58753dba800de14144785199fd710e9b00544155

commit r14-9513-g58753dba800de14144785199fd710e9b00544155
Author: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Date:   Sun Mar 10 18:18:51 2024 +0100

    testsuite: Define _POSIX_C_SOURCE for test
    
    As the tests assume that strndup() is visible (only part of
    POSIX.1-2008) define the guard to ensure that it's visible.  Currently,
    glibc appears to always have this defined in C++, newlib does not.
    
    Without this patch, fails like this can be seen:
    
    Testing analyzer/strndup-1.c,  -std=c++98
    .../strndup-1.c: In function 'void test_1(const char*)':
    .../strndup-1.c:11:13: error: 'strndup' was not declared in this scope; did you mean 'strncmp'?
    .../strndup-1.c: In function 'void test_2(const char*)':
    .../strndup-1.c:16:13: error: 'strndup' was not declared in this scope; did you mean 'strncmp'?
    .../strndup-1.c: In function 'void test_3(const char*)':
    .../strndup-1.c:21:13: error: 'strndup' was not declared in this scope; did you mean 'strncmp'?
    
    Patch has been verified on Linux.
    
    gcc/testsuite/ChangeLog:
    
            * c-c++-common/analyzer/strndup-1.c: Define _POSIX_C_SOURCE.
    
    Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>

Diff:
---
 gcc/testsuite/c-c++-common/analyzer/strndup-1.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/c-c++-common/analyzer/strndup-1.c b/gcc/testsuite/c-c++-common/analyzer/strndup-1.c
index 85ccae85d83..577ece0cfba 100644
--- a/gcc/testsuite/c-c++-common/analyzer/strndup-1.c
+++ b/gcc/testsuite/c-c++-common/analyzer/strndup-1.c
@@ -1,4 +1,5 @@
 /* { dg-skip-if "no strndup in libc" { *-*-darwin[789]* *-*-darwin10* hppa*-*-hpux* *-*-mingw* *-*-vxworks* } } */
+/* { dg-additional-options "-D_POSIX_C_SOURCE=200809L" } */
 
 #include <string.h>
 #include <stdlib.h>