Cater better to underquoted callers

Problem reported by Frederic Berat in:
https://lists.gnu.org/r/autoconf/2022-11/msg00092.html
* lib/autoconf/c.m4 (AC_LANG_CALL(C)): Omit comma in comment,
which triggers bugs in underquoted callers.

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index 5e4301e743b106bc587290c47c939651dd2533a5..a388599c1a37b445805706a4a6e615fb111e03ca 100644 (file)
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -128,7 +128,7 @@ m4_if([$2], [main], ,
    Use char because int might match the return type of a GCC
    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
+   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"