[PATCH] extensions: port to more ISO C TSes

[Paul Eggert]

* m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Sync from Autoconf
master, to add support for more recent ISO C TRs and TSes.
---
 ChangeLog        |  6 ++++++
 m4/extensions.m4 | 20 ++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index a936166..b3247df 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-09-15  Paul Eggert  <address@hidden>
+
+       extensions: port to more ISO C TSes
+       * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Sync from Autoconf
+       master, to add support for more recent ISO C TRs and TSes.
+
 2016-09-13  Paul Eggert  <address@hidden>
 
        intprops: new macro TYPE_WIDTH
diff --git a/m4/extensions.m4 b/m4/extensions.m4
index ba54640..87721a3 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -72,18 +72,34 @@ dnl configure.ac when using autoheader 2.62.
 #ifndef _POSIX_PTHREAD_SEMANTICS
 # undef _POSIX_PTHREAD_SEMANTICS
 #endif
+/* Enable extensions specified by ISO/IEC TS 18661-5:2014.  */
+#ifndef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
+# undef __STDC_WANT_IEC_60559_ATTRIBS_EXT__
+#endif
 /* Enable extensions specified by ISO/IEC TS 18661-1:2014.  */
 #ifndef __STDC_WANT_IEC_60559_BFP_EXT__
 # undef __STDC_WANT_IEC_60559_BFP_EXT__
 #endif
+/* Enable extensions specified by ISO/IEC TS 18661-2:2015.  */
+#ifndef __STDC_WANT_IEC_60559_DFP_EXT__
+# undef __STDC_WANT_IEC_60559_DFP_EXT__
+#endif
 /* Enable extensions specified by ISO/IEC TS 18661-4:2015.  */
 #ifndef __STDC_WANT_IEC_60559_FUNCS_EXT__
 # undef __STDC_WANT_IEC_60559_FUNCS_EXT__
 #endif
+/* Enable extensions specified by ISO/IEC TS 18661-3:2015.  */
+#ifndef __STDC_WANT_IEC_60559_TYPES_EXT__
+# undef __STDC_WANT_IEC_60559_TYPES_EXT__
+#endif
 /* Enable extensions specified by ISO/IEC TR 24731-2:2010.  */
 #ifndef __STDC_WANT_LIB_EXT2__
 # undef __STDC_WANT_LIB_EXT2__
 #endif
+/* Enable extensions specified by ISO/IEC TR 24747:2009.  */
+#ifndef __STDC_WANT_MATH_SPEC_FUNCS__
+# undef __STDC_WANT_MATH_SPEC_FUNCS__
+#endif
 /* Enable extensions on HP NonStop.  */
 #ifndef _TANDEM_SOURCE
 # undef _TANDEM_SOURCE
@@ -113,9 +129,13 @@ dnl configure.ac when using autoheader 2.62.
   AC_DEFINE([_DARWIN_C_SOURCE])
   AC_DEFINE([_GNU_SOURCE])
   AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
+  AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
   AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])
+  AC_DEFINE([__STDC_WANT_IEC_60559_DFP_EXT__])
   AC_DEFINE([__STDC_WANT_IEC_60559_FUNCS_EXT__])
+  AC_DEFINE([__STDC_WANT_IEC_60559_TYPES_EXT__])
   AC_DEFINE([__STDC_WANT_LIB_EXT2__])
+  AC_DEFINE([__STDC_WANT_MATH_SPEC_FUNCS__])
   AC_DEFINE([_TANDEM_SOURCE])
   AC_CACHE_CHECK([whether _XOPEN_SOURCE should be defined],
     [ac_cv_should_define__xopen_source],
-- 
2.7.4