[PATCH] portability fix for gcc.dg/strncmp-2.c testcase

[Aaron Sawdey]

This testcase I added failed to compile on AIX or older linux due to
the use of aligned_alloc(). Now fixed to use posix_memalign if
available, and valloc otherwise.

Now it compiles and passes on x86_64 (fedora 25), ppc64 (RHEL6.8), and
AIX. OK for trunk?

2017-02-14  Aaron Sawdey  <acsaw...@linux.vnet.ibm.com>

        * gcc.dg/strncmp-2.c: Portability fixes.

-- 
Aaron Sawdey, Ph.D.  acsaw...@linux.vnet.ibm.com
050-2/C113  (507) 253-7520 home: 507/263-0782
IBM Linux Technology Center - PPC Toolchain
Index: strncmp-2.c
===================================================================
--- strncmp-2.c	(revision 245439)
+++ strncmp-2.c	(working copy)
@@ -19,7 +19,12 @@
 {
   long pgsz = sysconf(_SC_PAGESIZE);
   char buf1[sz+1];
-  char *buf2 = aligned_alloc(pgsz,2*pgsz);
+  char *buf2;
+#if _POSIX_C_SOURCE >= 200112L
+  if ( posix_memalign ((void **)&buf2, pgsz, 2*pgsz) ) abort ();
+#else
+  if ( !(buf2 = valloc(2*pgsz))) abort ();
+#endif
   char *p2;
   int r,i,e;
 
@@ -35,6 +40,7 @@
     e = lib_memcmp(buf1,p2,sz);
     (*test_memcmp)(buf1,p2,e);
   }
+  free(buf2);
 }
 
 #define RUN_TEST(SZ) test_driver_strncmp (test_strncmp_ ## SZ, test_memcmp_ ## SZ, SZ);