[sr #110392] Define _NETBSD_SOURCE and _OPENBSD_SOURCE in AC_USE_SYSTEM_EXTENSIONS

URL:
  <https://savannah.gnu.org/support/?110392>

                 Summary: Define _NETBSD_SOURCE and _OPENBSD_SOURCE in
AC_USE_SYSTEM_EXTENSIONS
                 Project: Autoconf
            Submitted by: iulius
            Submitted on: Sun 06 Dec 2020 09:08:28 AM UTC
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

Hi,

A few prototypes are available on NetBSD only when _NETBSD_SOURCE or
_OPENBSD_SOURCE are set.
Would it be possible to add them to AC_USE_SYSTEM_EXTENSIONS?

--- specific.m4.old	2020-12-06 09:54:37.394649064 +0100
+++ specific.m4	2020-12-06 09:59:35.490562935 +0100
@@ -396,6 +396,14 @@
 #ifndef _GNU_SOURCE
 # undef _GNU_SOURCE
 #endif
+/* Enable NetBSD extensions on NetBSD.  */
+#ifndef _NETBSD_SOURCE
+# undef _NETBSD_SOURCE
+#endif
+/* Enable OpenBSD extensions on NetBSD.  */
+#ifndef _OPENBSD_SOURCE
+# undef _OPENBSD_SOURCE
+#endif
 /* Enable threading extensions on Solaris.  */
 #ifndef _POSIX_PTHREAD_SEMANTICS
 # undef _POSIX_PTHREAD_SEMANTICS
@@ -456,6 +464,8 @@
   AC_DEFINE([_ALL_SOURCE])
   AC_DEFINE([_DARWIN_C_SOURCE])
   AC_DEFINE([_GNU_SOURCE])
+  AC_DEFINE([_NETBSD_SOURCE])
+  AC_DEFINE([_OPENBSD_SOURCE])
   AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
   AC_DEFINE([__STDC_WANT_IEC_60559_ATTRIBS_EXT__])
   AC_DEFINE([__STDC_WANT_IEC_60559_BFP_EXT__])


Seems like a few projects already use it locally:
 
http://tug.ctan.org/tex-archive/macros/texinfo/texinfo/gnulib/m4/extensions.m4

And we recently encountered a build issue with reallocarray (NetBSD preferring
reallocarr):
 
https://git.eyrie.org/?p=devel/rra-c-util.git;a=commitdiff;h=f8a922cf31804dcc25ac176dcc22fdcdffcb5fdf


Thanks beforehand,

-- 
Julien ÉLIE





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