[gcc/devel/c++-modules] libstdc++: Adjust std::from_chars negative tests

[Nathan Sidwell <nathan@gcc.gnu.org>]

https://gcc.gnu.org/g:b81d4f1e3d6a519afa20d84304f12ee639fde944

commit b81d4f1e3d6a519afa20d84304f12ee639fde944
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Jun 23 12:20:26 2020 +0100

    libstdc++: Adjust std::from_chars negative tests
    
    Also test with an enumeration type. Move the dg-error directives outside
    the #if block, because DejaGnu would process them whether or not wchar_t
    support is present.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/20_util/from_chars/1_c++20_neg.cc: Check enumeration
            type.
            * testsuite/20_util/from_chars/1_neg.cc: Likewise. Move dg-error
            directives outside preprocessor condition.

Diff:
---
 libstdc++-v3/testsuite/20_util/from_chars/1_c++20_neg.cc | 3 +++
 libstdc++-v3/testsuite/20_util/from_chars/1_neg.cc       | 8 +++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/20_util/from_chars/1_c++20_neg.cc b/libstdc++-v3/testsuite/20_util/from_chars/1_c++20_neg.cc
index 8a73b2de72d..8454b304d13 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/1_c++20_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/1_c++20_neg.cc
@@ -35,6 +35,9 @@ test01(const char* first, const char* last)
   char32_t c32;
   std::from_chars(first, last, c32); // { dg-error "no matching" }
   std::from_chars(first, last, c32, 10); // { dg-error "no matching" }
+  enum E { } e;
+  std::from_chars(first, last, e); // { dg-error "no matching" }
+  std::from_chars(first, last, e, 10); // { dg-error "no matching" }
 }
 
 // { dg-prune-output "enable_if" }
diff --git a/libstdc++-v3/testsuite/20_util/from_chars/1_neg.cc b/libstdc++-v3/testsuite/20_util/from_chars/1_neg.cc
index 3f46b7e7b95..12b5e597b9f 100644
--- a/libstdc++-v3/testsuite/20_util/from_chars/1_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/from_chars/1_neg.cc
@@ -25,9 +25,11 @@ test01(const char* first, const char* last)
 {
 #if _GLIBCXX_USE_WCHAR_T
   wchar_t wc;
+#else
+  enum W { } wc;
+#endif
   std::from_chars(first, last, wc); // { dg-error "no matching" }
   std::from_chars(first, last, wc, 10); // { dg-error "no matching" }
-#endif
 
   char16_t c16;
   std::from_chars(first, last, c16); // { dg-error "no matching" }
@@ -35,6 +37,10 @@ test01(const char* first, const char* last)
   char32_t c32;
   std::from_chars(first, last, c32); // { dg-error "no matching" }
   std::from_chars(first, last, c32, 10); // { dg-error "no matching" }
+
+  enum E { } e;
+  std::from_chars(first, last, e); // { dg-error "no matching" }
+  std::from_chars(first, last, e, 10); // { dg-error "no matching" }
 }
 
 // { dg-prune-output "enable_if" }