bootstrap [was: branch-1_4 - provide a man page]

[Eric Blake]

Eric Blake <ebb9 <at> byu.net> writes:

> Also in this fix: a modifier order cleanup, plus a fix to allow bootstrapping 
> with autoconf 2.59 and m4 configured with --enable-changeword
...
> 
> 2006-06-07  Eric Blake  <ebb9 <at> byu.net>
> 
>       * configure.ac (changeword): Disable changeword for the creation
>       of configure, in case of bootstrapping with an m4 configured with
>       --enable-changeword.

Oops.  Now I broke bootstrap the other direction, when the system m4 does not 
have changeword.  m4sugar intentionally dies when undefining a macro that is 
not there.

I also cleaned up some cruft, reducing the size of configure without breaking 
compilation, in preparations for experimenting with using gnulib to provide 
lib/regex.c and friends.

2006-06-08  Eric Blake  <address@hidden>

        * configure.ac (changeword): Work even when changeword is not a
        macro.
        (AC_PROG_AWK, AC_PROG_INSTALL, AC_PROG_MAKE_SET, AC_HEADER_STDC):
        Delete; now done by automake.
        (AC_ISC_POSIX, AC_C_CONST): Delete; now obsolete.

Index: configure.ac
===================================================================
RCS file: /sources/m4/m4/configure.ac,v
retrieving revision 1.36.2.10
diff -u -r1.36.2.10 configure.ac
--- configure.ac        7 Jun 2006 18:46:42 -0000       1.36.2.10
+++ configure.ac        8 Jun 2006 19:38:47 -0000
@@ -28,20 +28,14 @@
 AC_CONFIG_SRCDIR([src/m4.h])
 AC_CONFIG_HEADERS([config.h:config-h.in])
 
-AC_PROG_AWK
 AC_PROG_CC
-AC_PROG_INSTALL
-AC_PROG_MAKE_SET
 AC_PROG_RANLIB
 
 AC_AIX
-AC_ISC_POSIX
 AC_MINIX
-AC_C_CONST
 
 AC_CHECK_HEADERS([limits.h memory.h siginfo.h string.h unistd.h])
 AC_CHECK_HEADERS([signal.h sys/signal.h], [break])
-AC_HEADER_STDC
 AC_TYPE_SIGNAL
 AC_TYPE_SIZE_T
 
@@ -101,7 +95,7 @@
 
 dnl Don't let changeword get in our way, if bootstrapping with a version of
 dnl m4 that already turned the feature on.
-m4_undefine([changeword])dnl
+m4_ifdef([changeword], [m4_undefine([changeword])])dnl
 
 AC_MSG_CHECKING([[if changeword is wanted]])
 AC_ARG_ENABLE([changeword],