[gcc(refs/users/aoliva/heads/testme)] [testsuite] tolerate missing std::stold

[Alexandre Oliva]

https://gcc.gnu.org/g:91567f852bf94671d0e30e867ae9e4ba87ccb86b

commit 91567f852bf94671d0e30e867ae9e4ba87ccb86b
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu May 15 05:11:23 2025 -0300

    [testsuite] tolerate missing std::stold
    
    basic_string.h doesn't define the non-w string version of std::stold
    when certain conditions aren't met, and then a couple of tests fail to
    compile.
    
    Guard the portions of the tests that depend on std::stold with the
    conditions for it to be defined.
    
    
    for  libstdc++-v3/ChangeLog
    
            * testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc:
            Guard non-wide stold calls with conditions for it to be
            defined.
            * testsuite/27_io/basic_ostream/inserters_arthmetic/char/hexfloat.cc:
            Likewise.

Diff:
---
 .../21_strings/basic_string/numeric_conversions/char/stold.cc       | 6 ++++++
 .../27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc       | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc b/libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc
index b64ad0c86834..dd777c4529a0 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc
@@ -31,6 +31,11 @@
 void
 test01()
 {
+  /* If these conditions are not met, basic_string.h doesn't define
+     std::stold(const string&, size_t* = 0), and then the test would
+     fail to compile.  */
+#if (_GLIBCXX_HAVE_STRTOLD && ! _GLIBCXX_HAVE_BROKEN_STRTOLD) \
+  || __DBL_MANT_DIG__ == __LDBL_MANT_DIG__
   bool test = false;
   using namespace std;
 
@@ -106,6 +111,7 @@ test01()
       test = false;
     }
   VERIFY( test );
+#endif
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc
index b1bc7fbb9d4e..f694730901ed 100644
--- a/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc
+++ b/libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/hexfloat.cc
@@ -95,6 +95,11 @@ test01()
 void
 test02()
 {
+  /* If these conditions are not met, basic_string.h doesn't define
+     std::stold(const string&, size_t* = 0), and then the test would
+     fail to compile.  */
+#if (_GLIBCXX_HAVE_STRTOLD && ! _GLIBCXX_HAVE_BROKEN_STRTOLD) \
+  || __DBL_MANT_DIG__ == __LDBL_MANT_DIG__
   ostringstream os;
   long double d = 272.L; // 0x1.1p+8L;
   os << hexfloat << setprecision(1);
@@ -140,6 +145,7 @@ test02()
   cout << "got: " << os.str() << endl;
 #endif
   VERIFY( os && os.str() == "15" );
+#endif
 }
 
 int