libstdc++: Stop using TR1 macros in <cctype> and <cfenv>

As with the two commits before this, the _GLIBCXX_USE_C99_CTYPE_TR1 and
_GLIBCXX_USE_C99_FENV_TR1 macros are misleading when they are also used
for <cctype> and <cfenv>, not only for TR1 headers. It is also wrong,
because the configure checks for TR1 use -std=c++98 and a target might
define the C99 features for C++11 but not for C++98.

Add separate configure checks for the <ctype.h> and <fenv.h> features using -std=c++11
for the checks. Use the new macros defined by those checks in the
C++11-specific parts of <cctype>, <cfenv>, and <fenv.h>.

libstdc++-v3/ChangeLog:

	* acinclude.m4 (GLIBCXX_USE_C99): Check for isblank in C++11
	mode and define _GLIBCXX_USE_C99_CTYPE. Check for <fenv.h>
	functions in C++11 mode and define _GLIBCXX_USE_C99_FENV.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_compatibility/fenv.h: Check _GLIBCXX_USE_C99_FENV
	instead of _GLIBCXX_USE_C99_FENV_TR1.
	* include/c_global/cfenv: Likewise.
	* include/c_global/cctype: Check _GLIBCXX_USE_C99_CTYPE instead
	of _GLIBCXX_USE_C99_CTYPE_TR1.

1 files changed, 8 insertions, 0 deletions

diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index 62be4c7..f91f7eb 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -902,10 +902,18 @@
    library functions to be present. */
 #undef _GLIBCXX_USE_C99_COMPLEX_TR1
 
+/* Define if C99 functions in <ctype.h> should be imported in <cctype> in
+   namespace std for C++11. */
+#undef _GLIBCXX_USE_C99_CTYPE
+
 /* Define if C99 functions in <ctype.h> should be imported in <tr1/cctype> in
    namespace std::tr1. */
 #undef _GLIBCXX_USE_C99_CTYPE_TR1
 
+/* Define if C99 functions in <fenv.h> should be imported in <cfenv> in
+   namespace std for C++11. */
+#undef _GLIBCXX_USE_C99_FENV
+
 /* Define if C99 functions in <fenv.h> should be imported in <tr1/cfenv> in
    namespace std::tr1. */
 #undef _GLIBCXX_USE_C99_FENV_TR1