Bruno Haible wrote: > Paolo Bonzini wrote: >> @@ -47,4 +47,5 @@ >> gl_AS_VAR_IF([gl_Warn], [yes], [gl_AS_VAR_APPEND([gl_Flags], [" $1"])]) >> AS_VAR_POPDEF([gl_Flags])dnl >> AS_VAR_POPDEF([gl_Warn])dnl >> +AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])dnl > > AS_LITERAL_IF is not documented in autoconf 2.63. Is there a documented > replacement?
No, but it has been forever in M4sh. I'll prepare a documentation patch. > Also, if only one argument is given, won't this do an AC_SUBST([]) ? Yes. And I thought it was a no-op (that's why I AC_SUBSTed WARN_CFLAGS separately), but it gives an error. diff --git a/m4/warnings.m4 b/m4/warnings.m4 index ca9bf5e..71a8e56 100644 --- a/m4/warnings.m4 +++ b/m4/warnings.m4 @@ -47,5 +47,5 @@ gl_AS_VAR_IF([gl_Warn], [yes], [gl_AS_VAR_APPEND([gl_Flags], [" $1"])]) AS_VAR_POPDEF([gl_Flags])dnl AS_VAR_POPDEF([gl_Warn])dnl -AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])dnl +m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl ]) Paolo
