[RFA] Require powerpc_vsx_ok in gcc.target/powerpc/pr71763.c

[Joel Brobecker]

From: Douglas Rupp <rupp@adacore.com>

Hello,

(submitting this on behalf of Doug Rupp, one of my colleagues)

We're getting an error when running this test on PowerPC VxWorks 7,
due to an unexpected warning:

    | Excess errors:
    | cc1: warning: '-mvsx' and '-mno-altivec' are incompatible

The warning comes from a combination of factors:
  - The test itself uses -mvsx explicitly via the following directive:
       // { dg-options "-O1 -mvsx" }
  - Our toolchain was configured so as to make -mno-altivec
    the default;
  - These two options are mutually exclusive.

This commit adds a powerpc_vsx_ok dg-require-effective-target directive
to that test, and thus making it UNSUPPORTED instead.

Tested on PowerPC VxWorks 7. Also tested on PowerPC ELF as well,
a platform where we do not make -mno-altivec the default, to verify
that the test continues to run as usual in that case.

gcc/testsuite/

        * gcc.target/powerpc/pr71763.c: Require powerpc_vsx_ok.

OK for master?

Thanks!
-- 
Joel

---
 gcc/testsuite/gcc.target/powerpc/pr71763.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.target/powerpc/pr71763.c b/gcc/testsuite/gcc.target/powerpc/pr71763.c
index b36ddfa26b0..b8888394393 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr71763.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr71763.c
@@ -1,5 +1,6 @@
 // PR target/71763
 // { dg-do compile }
+// { dg-require-effective-target powerpc_vsx_ok }
 // { dg-options "-O1 -mvsx" }
 
 int a, b;
-- 
2.17.1