[PATCH][ARM,testsuite] Skip copysign_softfloat_1.c on hard-float targets

[Christophe Lyon]

Hi,

The attached testsuite patch makes
gcc.target/arm/copysign_softfloat_1.c UNSUPPORTED on
arm-none-linux-gnueabihf, rather than FAIL/UNRESOLVED because of a
link failure since the toolchain startup code is in hard-float ABI
while the testcase is compiled with -mfloat-abi=soft.

Tested on arm* configurations, with no impact on arm*eabi and
FAIL->UNSUPPORTED on arm*hf targets.

OK?

Thanks,

Christophe

gcc/testsuite/ChangeLog:

2017-11-10  Christophe Lyon  <christophe.l...@linaro.org>

        * lib/target-supports.exp (check_effective_target_arm_soft_ok):
        New function.
        * gcc.target/arm/copysign_softfloat_1.c: Require arm_soft_ok
        effective target.


diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index d7ef04f..6917a4d 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -3413,6 +3413,19 @@ proc check_effective_target_arm_vect_no_misalign { } {
 }
 
 
+# Return 1 if this is an ARM target supporting -mfloat-abi=soft.  Some
+# multilibs may be incompatible with this option.
+
+proc check_effective_target_arm_soft_ok { } {
+    if { [check_effective_target_arm32] } {
+       return [check_no_compiler_messages arm_soft_ok executable {
+           int main() { return 0;}
+       } "-mfloat-abi=soft"]
+    } else {
+       return 0
+    }
+}
+
 # Return 1 if this is an ARM target supporting -mfpu=vfp
 # -mfloat-abi=softfp.  Some multilibs may be incompatible with these
 # options.
diff --git a/gcc/testsuite/gcc.target/arm/copysign_softfloat_1.c 
b/gcc/testsuite/gcc.target/arm/copysign_softfloat_1.c
index 1260a6f..d79d014 100644
--- a/gcc/testsuite/gcc.target/arm/copysign_softfloat_1.c
+++ b/gcc/testsuite/gcc.target/arm/copysign_softfloat_1.c
@@ -1,5 +1,6 @@
 /* { dg-do run } */
 /* { dg-require-effective-target arm_thumb2_ok } */
+/* { dg-require-effective-target arm_soft_ok } */
 /* { dg-skip-if "skip override" { *-*-* } { "-mfloat-abi=softfp" 
"-mfloat-abi=hard" } { "" } } */
 /* { dg-options "-O2 -mfloat-abi=soft --save-temps" } */
 extern void abort (void);