[v3] libstdc++/34032

[Paolo Carlini <pcarlini@suse.de>]

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Hi,

tested x86_64-linux and powerpc-darwin by me and cygwin by Eric Niebler,
committed to mainline.

Paolo.

/////////////////////

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2007-11-09  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/34032
	* acinclude.m4 ([GLIBCXX_ENABLE_C99], [GLIBCXX_CHECK_C99_TR1]):
	Use -std=c++98 instead of the default -std=gnu++98.
	* configure: Regenerate.

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Index: acinclude.m4
===================================================================
--- acinclude.m4	(revision 130038)
+++ acinclude.m4	(working copy)
@@ -763,9 +763,13 @@
   AC_LANG_SAVE
   AC_LANG_CPLUSPLUS
 
-  # Use -fno-exceptions so that the C driver can link these tests without
-  # hitting undefined references to personality routines.
+  # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
+  # undefined and fake C99 facilities - like pre-standard snprintf - may be
+  # spuriously enabled.
+  # Long term, -std=c++0x could be even better, could manage to explicitely
+  # request C99 facilities to the underlying C headers.
   ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -std=c++98"
   ac_save_LIBS="$LIBS"
   ac_save_gcc_no_link="$gcc_no_link"
 
@@ -996,6 +1000,11 @@
   AC_LANG_SAVE
   AC_LANG_CPLUSPLUS
 
+  # Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
+  # undefined and fake C99 facilities may be spuriously enabled.
+  ac_save_CXXFLAGS="$CXXFLAGS"
+  CXXFLAGS="$CXXFLAGS -std=c++98"
+
   # Check for the existence of <complex.h> complex math functions used
   # by tr1/complex.
   AC_CHECK_HEADERS(complex.h, ac_has_complex_h=yes, ac_has_complex_h=no)
@@ -1266,6 +1275,7 @@
   # Check for the existence of the <stdbool.h> header.	
   AC_CHECK_HEADERS(stdbool.h)
 
+  CXXFLAGS="$ac_save_CXXFLAGS"
   AC_LANG_RESTORE
 ])