use guile subrs

[bpt/emacs.git] / m4 / gnulib-common.m4

diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index 1bb316b..35f6195 100644 (file)
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -50,7 +50,8 @@ AC_DEFUN([gl_COMMON_BODY], [
 #define _UNUSED_PARAMETER_ _GL_UNUSED
 
 /* gcc supports the "unused" attribute on possibly unused labels, and
-   g++ has since version 4.5.  */
+   g++ has since version 4.5.  Note to support C++ as well as C,
+   _GL_UNUSED_LABEL should be used with a trailing ;  */
 #if !defined __cplusplus || __GNUC__ > 4 \
     || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 # define _GL_UNUSED_LABEL _GL_UNUSED