diff options
| -rw-r--r-- | NEWS | 12 | ||||
| -rw-r--r-- | lib/autoconf/headers.m4 | 8 |
2 files changed, 15 insertions, 5 deletions
@@ -44,8 +44,16 @@ GNU Autoconf NEWS - User visible changes. variables used later in the configure script, or in generated Makefiles. - - AC_REQUIRE must not appear inside hand-written shell conditional - constructs. Use AS_IF, AS_FOR, etc. instead. + - Autoconf macros that use AC_REQUIRE internally, are not safe to + use inside of hand-written shell conditional or looping + constructs. Use AS_IF, AS_CASE, AS_FOR, etc. instead. + (See the “Prerequisite Macros” section of the manual for + further explanation.) + + The set of macros that use AC_REQUIRE internally may change from + release to release. The only macros that are guaranteed *not* to + use AC_REQUIRE are the macros for acting on the results of a + test: AC_DEFINE, AC_SUBST, AC_MSG_*, AC_CACHE_CHECK, etc. - AC_REQUIRE cannot be applied to macros that need to be used with arguments. Instead, invoke the macro normally, with its arguments. diff --git a/lib/autoconf/headers.m4 b/lib/autoconf/headers.m4 index ae8bf28f..cd750ebe 100644 --- a/lib/autoconf/headers.m4 +++ b/lib/autoconf/headers.m4 @@ -655,9 +655,11 @@ fi # AU::AC_HEADER_STDC # ------------------ AU_DEFUN([AC_HEADER_STDC], -[# Autoupdate added the following line to ensure that your configure -# script's behavior did not change. It is probably safe to remove. -AC_CHECK_INCLUDES_DEFAULT], +[# Autoupdate added the next two lines to ensure that your configure +# script's behavior did not change. They are probably safe to remove. +AC_CHECK_INCLUDES_DEFAULT +AC_PROG_EGREP +], [The preprocessor macro `STDC_HEADERS' is obsolete. Except in unusual embedded environments, you can safely include all ISO C90 headers unconditionally.]) |