re PR libstdc++/31836 (FAIL: 27_io/basic_istream/extractors_arithmetic/char/12.cc execution test)

	PR libstdc++/31836
	* config/locale/generic/c_locale.cc (__convert_to_v): Don't use
	strtold if _GLIBCXX_HAVE_BROKEN_STRTOLD is defined.
	* config/os/hpux/os_defines.h (_GLIBCXX_HAVE_BROKEN_STRTOLD): Define
	if __hppa__ is defined.

From-SVN: r126914

libstdc++-v3/ChangeLog

+2007-07-25  John Davind Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR libstdc++/31836
+	* config/locale/generic/c_locale.cc (__convert_to_v): Don't use
+	strtold if _GLIBCXX_HAVE_BROKEN_STRTOLD is defined.
+	* config/os/hpux/os_defines.h (_GLIBCXX_HAVE_BROKEN_STRTOLD): Define
+	if __hppa__ is defined.
+
 2007-07-16  Rainer Orth  <ro@TechFak.Uni-Bielefeld.DE>
 
 	PR bootstrap/3456

libstdc++-v3/config/locale/generic/c_locale.cc

@@ -149,7 +149,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
       errno = 0;
 #endif
 
-#if defined(_GLIBCXX_HAVE_STRTOLD)
+#if defined(_GLIBCXX_HAVE_STRTOLD) && !defined(_GLIBCXX_HAVE_BROKEN_STRTOLD)
       char* __sanity;
       long double __ld = strtold(__s, &__sanity);
 

libstdc++-v3/config/os/hpux/os_defines.h

@@ -97,4 +97,12 @@ typedef long int __padding_type;
    are weak; gthread relies on such unsatisfied references being resolved
    to null pointers when weak symbol support is on.  */
 #define _GLIBCXX_GTHREAD_USE_WEAK 0
+
+// The strtold function is obsolete and not C99 conformant on PA HP-UX.
+// It returns plus or minus _LDBL_MAX instead of plus or minus HUGE_VALL
+// if the correct value would cause overflow.  It doesn't handle "inf",
+// "infinity" and "nan".  It is not thread safe. 
+#if defined (__hppa__)
+#define _GLIBCXX_HAVE_BROKEN_STRTOLD 1
+#endif
 #endif