| https://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=b27bc3e230bb12fdd9a813e38e82bc4c3e22b4cc |
| |
| Note: we drop the comma from the comment because some packages |
| have bad quoting, and while that will need to be sorted when/if |
| autoconf 2.72 is released, we've got our hands full with the |
| Clang situation right now (bug #871753). |
| |
| From b27bc3e230bb12fdd9a813e38e82bc4c3e22b4cc Mon Sep 17 00:00:00 2001 |
| From: Paul Eggert <eggert@cs.ucla.edu> |
| Date: Tue, 31 Aug 2021 16:30:46 -0700 |
| Subject: Port AC_LANG_CALL(C) to C++ |
| MIME-Version: 1.0 |
| Content-Type: text/plain; charset=UTF-8 |
| Content-Transfer-Encoding: 8bit |
| |
| * lib/autoconf/c.m4 (AC_LANG_CALL(C)): Add an extern "C" if C++. |
| Problem reported by Vincent Lefèvre (sr #110532). |
| --- a/lib/autoconf/c.m4 |
| +++ b/lib/autoconf/c.m4 |
| @@ -126,7 +126,13 @@ m4_define([AC_LANG_CALL(C)], |
| m4_if([$2], [main], , |
| [/* Override any GCC internal prototype to avoid an error. |
| Use char because int might match the return type of a GCC |
| - builtin and then its argument prototype would still apply. */ |
| + builtin and then its argument prototype would still apply. |
| + The 'extern "C"' is for builds by C++ compilers; |
| + although this is not generally supported in C code supporting it here |
| + has little cost and some practical benefit (sr 110532). */ |
| +#ifdef __cplusplus |
| +extern "C" |
| +#endif |
| char $2 ();])], [return $2 ();])]) |
| |
| |
| cgit v1.1 |
