diff options
| -rw-r--r-- | lib/autoconf/c.m4 | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4 index 44443a39..48bd49a3 100644 --- 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 ();])]) |