[patch] lto test: Add dg-require-effective-target lto on test using -flto

[Olivier Hainque]

Hello,

This patch is a proposal to add a

  /* { dg-require-effective-target lto } */

directive to a "dg-do link" test using -flto, to
prevent failure on targets missing LTO support such
as VxWorks for it's "kernel" mode where modules are
only partially linked.

I have checked that the test still runs and passes
on a regular native x86_64-linux environment.

Ok to commit ?

Thanks in advance,

Best Regards,

Olivier

2020-11-02  Olivier Hainque  <hain...@adacore.com>
    
testuite/
        * gcc.dg/tree-ssa/pr71077.c: Add
        dg-require-effective-target lto.


diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr71077.c 
b/gcc/testsuite/gcc.dg/tree-ssa/pr71077.c
index 4753740f762d..259055fbe9a6 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr71077.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr71077.c
@@ -1,5 +1,6 @@
 /* PR c++/71077  */
 /* { dg-do link { target { i?86-*-* x86_64-*-* } } }  */
+/* { dg-require-effective-target lto } */
 /* { dg-options "-O3 -flto -march=core-avx2" }  */
 
 int *a;
-- 
2.17.1