[gcc r13-1297] libstdc++: testsuite: require cmath for exp simd

[Alexandre Oliva]

https://gcc.gnu.org/g:8fce31f69bc6800b81eb7f274d6128162f5ec8b1

commit r13-1297-g8fce31f69bc6800b81eb7f274d6128162f5ec8b1
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Mon Jun 27 10:34:19 2022 -0300

    libstdc++: testsuite: require cmath for exp simd
    
    simd_math.h assumes declarations for many C99 functions to be present,
    that libstdc++ doesn't add to target systems that don't have them in
    the C library.
    
    Add the C99 math requirement to tests for simd features, so that they
    don't fail because of limitations of the target C library.
    
    
    for  libstdc++-v3/ChangeLog
    
            * testsuite/experimental/simd/standard_abi_usable.cc: Require
            cmath support.
            * testsuite/experimental/simd/standard_abi_usable_2.cc:
            Likewise.

Diff:
---
 libstdc++-v3/testsuite/experimental/simd/standard_abi_usable.cc   | 1 +
 libstdc++-v3/testsuite/experimental/simd/standard_abi_usable_2.cc | 1 +
 2 files changed, 2 insertions(+)

diff --git a/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable.cc b/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable.cc
index 4d7e6726951..1b686d9ca09 100644
--- a/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable.cc
@@ -1,5 +1,6 @@
 // { dg-options "-std=c++17 -fno-fast-math" }
 // { dg-do compile { target c++17 } }
+// { dg-require-cmath "" }
 
 // Copyright (C) 2020-2022 Free Software Foundation, Inc.
 //
diff --git a/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable_2.cc b/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable_2.cc
index a609adaf000..a0203d0b423 100644
--- a/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable_2.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/standard_abi_usable_2.cc
@@ -1,4 +1,5 @@
 // { dg-options "-std=c++17 -ffast-math" }
 // { dg-do compile }
+// { dg-require-cmath "" }
 
 #include "standard_abi_usable.cc"