[gcc r12-922] arm/testsuite: Fix testcase for PR99977

[gcc r12-922] arm/testsuite: Fix testcase for PR99977

[Christophe Lyon]

https://gcc.gnu.org/g:beeb01541ae845b445837b873126a7f968b8f654

commit r12-922-gbeeb01541ae845b445837b873126a7f968b8f654
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date:   Wed May 19 14:45:54 2021 +0000

    arm/testsuite: Fix testcase for PR99977
    
    Some targets (eg arm-none-uclinuxfdpiceabi) do not support Thumb-1,
    and since the testcase forces -march=armv8-m.base, we need to check
    whether this option is actually supported.
    
    Using dg-add-options arm_arch_v8m_base ensure that we pass -mthumb as
    needed too.
    
    2021-05-19  Christophe Lyon  <christophe.lyon@linaro.org>
    
            PR target/99977
            gcc/testsuite/
            * gcc.target/arm/pr99977.c: Require arm_arch_v8m_base.

Diff:
---
 gcc/testsuite/gcc.target/arm/pr99977.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.target/arm/pr99977.c b/gcc/testsuite/gcc.target/arm/pr99977.c
index 7911899d928..db330e4a4a3 100644
--- a/gcc/testsuite/gcc.target/arm/pr99977.c
+++ b/gcc/testsuite/gcc.target/arm/pr99977.c
@@ -1,5 +1,7 @@
 /* { dg-do compile } */
-/* { dg-options "-march=armv8-m.base -mfloat-abi=soft -O2" } */
+/* { dg-require-effective-target arm_arch_v8m_base_ok } */
+/* { dg-options "-O2" } */
+/* { dg-add-options arm_arch_v8m_base } */
 _Bool f1(int *p) { return __sync_bool_compare_and_swap (p, -1, 2); }
 _Bool f2(int *p) { return __sync_bool_compare_and_swap (p, -8, 2); }
 int g1(int *p) { return __sync_val_compare_and_swap (p, -1, 2); }