[PATCH, testsuite] Fix PR68629: attr-simd-3.c failure on arm-none-eabi targets

[Thomas Preud'homme]

c-c++-common/attr-simd-3.c fails to compile on arm-none-eabi targets due to 
-fcilkplus needing -pthread which is not available for those targets. This 
patch solves this issue by adding a condition to the cilkplus effective target 
that compiling with -fcilkplus succeeds and requires cilkplus as an effective 
target for attr-simd-3.c testcase.

ChangeLog entry is as follows:


*** gcc/testsuite/ChangeLog ***

2015-12-08  Thomas Preud'homme  <thomas.preudho...@arm.com>

        PR testsuite/68629
        * lib/target-supports.exp (check_effective_target_cilkplus): Also
        check that compiling with -fcilkplus does not give an error.
        * c-c++-common/attr-simd-3.c: Require cilkplus effective target.


diff --git a/gcc/testsuite/c-c++-common/attr-simd-3.c 
b/gcc/testsuite/c-c++-common/attr-simd-3.c
index d61ba82..1970c67 100644
--- a/gcc/testsuite/c-c++-common/attr-simd-3.c
+++ b/gcc/testsuite/c-c++-common/attr-simd-3.c
@@ -1,4 +1,5 @@
 /* { dg-do compile } */
+/* { dg-require-effective-target "cilkplus" } */
 /* { dg-options "-fcilkplus" } */
 /* { dg-prune-output "undeclared here \\(not in a function\\)|\[^\n\r\]* was 
not declared in this scope" } */
 
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 4e349e9..95b903c 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -1432,7 +1432,12 @@ proc check_effective_target_cilkplus { } {
     if { [istarget avr-*-*] } {
        return 0;
     }
-    return 1
+    return [ check_no_compiler_messages_nocache fcilkplus_available executable 
{
+       #ifdef __cplusplus
+       extern "C"
+       #endif
+           int dummy;
+       } "-fcilkplus" ]
 }
 
 proc check_linker_plugin_available { } {


Testsuite shows no regression when run with
  + an arm-none-eabi GCC cross-compiler targeting Cortex-M3
  + a bootstrapped x86_64-linux-gnu GCC native compiler

Is this ok for trunk?

Best regards,

Thomas