This patch modifies the change I made on July 12th. It modifies the test for
the __builtin_cpu_is and __builtin_cpu_supports built-in functions to use an
#ifdef instead of target-requires for doing the tests. One motavation is to
make the back port to GCC 6/7 easier, as I won't have to back port the change
to add the target option ppc_cpu_supports_hw.
I've checked the trunk with compilers built with a new GLIBC and without, and
it passes both compilers. I also checked the back port to GCC 6/7 and both
work fine as well.
Can I check this patch into the trunk and backports to GCC 6 and 7?
2017-07-18 Michael Meissner <meiss...@linux.vnet.ibm.com>
PR target/81193
* gcc.target/powerpc/cpu-builtin-1.c: Change test to use #ifdef
__BUILTIN_CPU_SUPPORTS to see if the GLIBC is new enough that
__builtin_cpu_is and __builtin_cpu_supports are supported.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meiss...@linux.vnet.ibm.com, phone: +1 (978) 899-4797
Index: gcc/testsuite/gcc.target/powerpc/cpu-builtin-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/cpu-builtin-1.c (revision 250316)
+++ gcc/testsuite/gcc.target/powerpc/cpu-builtin-1.c (working copy)
@@ -1,10 +1,14 @@
/* { dg-do compile { target { powerpc*-*-* } } } */
/* { dg-skip-if "" { powerpc*-*-darwin* } } */
-/* { dg-require-effective-target ppc_cpu_supports_hw } */
void
use_cpu_is_builtins (unsigned int *p)
{
+ /* If GCC was configured to use an old GLIBC (before 2.23), the
+ __builtin_cpu_is and __builtin_cpu_supports built-in functions return 0,
+ and the compiler issues a warning that you need a newer glibc to use them.
+ Use #ifdef to avoid the warning. */
+#ifdef __BUILTIN_CPU_SUPPORTS__
p[0] = __builtin_cpu_is ("power9");
p[1] = __builtin_cpu_is ("power8");
p[2] = __builtin_cpu_is ("power7");
@@ -20,11 +24,15 @@ use_cpu_is_builtins (unsigned int *p)
p[12] = __builtin_cpu_is ("ppc440");
p[13] = __builtin_cpu_is ("ppc405");
p[14] = __builtin_cpu_is ("ppc-cell-be");
+#else
+ p[0] = 0;
+#endif
}
void
use_cpu_supports_builtins (unsigned int *p)
{
+#ifdef __BUILTIN_CPU_SUPPORTS__
p[0] = __builtin_cpu_supports ("4xxmac");
p[1] = __builtin_cpu_supports ("altivec");
p[2] = __builtin_cpu_supports ("arch_2_05");
@@ -63,4 +71,7 @@ use_cpu_supports_builtins (unsigned int
p[35] = __builtin_cpu_supports ("ucache");
p[36] = __builtin_cpu_supports ("vcrypto");
p[37] = __builtin_cpu_supports ("vsx");
+#else
+ p[0] = 0;
+#endif
}
