[gcc r12-1148] libstdc++: Fix new test for C++98 mode [PR 89728]

[Jonathan Wakely]

https://gcc.gnu.org/g:b514fce354b5309a9c232a3fe9347e3abde4385f

commit r12-1148-gb514fce354b5309a9c232a3fe9347e3abde4385f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jun 1 19:01:37 2021 +0100

    libstdc++: Fix new test for C++98 mode [PR 89728]
    
    The isblank class is not supported until C++11.
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/22_locale/ctype/is/string/89728_neg.cc: Only test
            isblank for C++11 and later.

Diff:
---
 libstdc++-v3/testsuite/22_locale/ctype/is/string/89728_neg.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/testsuite/22_locale/ctype/is/string/89728_neg.cc b/libstdc++-v3/testsuite/22_locale/ctype/is/string/89728_neg.cc
index 9f15620c9a8..89843b68494 100644
--- a/libstdc++-v3/testsuite/22_locale/ctype/is/string/89728_neg.cc
+++ b/libstdc++-v3/testsuite/22_locale/ctype/is/string/89728_neg.cc
@@ -45,7 +45,9 @@ void test01()
   std::isxdigit(make_str<char, 7>(), loc);	// { dg-error "required from here" }
   std::isalnum(make_str<char, 8>(), loc);	// { dg-error "required from here" }
   std::isgraph(make_str<char, 9>(), loc);	// { dg-error "required from here" }
-  std::isblank(make_str<char, 10>(), loc);	// { dg-error "required from here" }
+#if __cplusplus >= 201103
+  std::isblank(make_str<char, 10>(), loc);	// { dg-error "required from here" "" { target c++11 } }
+#endif
   std::toupper(make_str<char, 11>(), loc);	// { dg-error "required from here" }
   std::tolower(make_str<char, 12>(), loc);	// { dg-error "required from here" }
 }
@@ -66,7 +68,9 @@ void test02()
   std::isxdigit(make_str<wchar_t, 7>(), loc);	// { dg-error "required from here" }
   std::isalnum(make_str<wchar_t, 8>(), loc);	// { dg-error "required from here" }
   std::isgraph(make_str<wchar_t, 9>(), loc);	// { dg-error "required from here" }
-  std::isblank(make_str<wchar_t, 10>(), loc);	// { dg-error "required from here" }
+#if __cplusplus >= 201103
+  std::isblank(make_str<wchar_t, 10>(), loc);	// { dg-error "required from here" "" { target c++11 } }
+#endif
   std::toupper(make_str<wchar_t, 11>(), loc);	// { dg-error "required from here" }
   std::tolower(make_str<wchar_t, 12>(), loc);	// { dg-error "required from here" }
 }