select: Simplify replacement idiom.

[pspp] / m4 / isnanf.m4

diff --git a/m4/isnanf.m4 b/m4/isnanf.m4
index 92024bb1079ff5bc0eac12dbb49a8d53af541980..f4aa44d5a03e0996744851dead09ed1fa8e3fdf8 100644 (file)
--- a/m4/isnanf.m4
+++ b/m4/isnanf.m4
@@ -17,6 +17,7 @@ AC_DEFUN([gl_FUNC_ISNANF],
       ISNANF_LIBM=-lm
     fi
   fi
+  dnl The variable gl_func_isnanf set here is used by isnan.m4.
   if test $gl_cv_func_isnanf_no_libm = yes \
      || test $gl_cv_func_isnanf_in_libm = yes; then
     save_LIBS="$LIBS"