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| author | Eric Blake <ebb9@byu.net> | 2007-02-02 14:07:38 +0000 |
|---|---|---|
| committer | Eric Blake <ebb9@byu.net> | 2007-02-02 14:07:38 +0000 |
| commit | b6386a5ae722cde1d2db552f5d302ae5eb11ca96 (patch) | |
| tree | 2ddbf4dc6e479873995f4243067ae4eb9d715490 /m4/m4.m4 | |
| parent | 82bce5064f14bfb60beb580bb304a2d460a03acd (diff) | |
| download | autoconf-b6386a5ae722cde1d2db552f5d302ae5eb11ca96.tar.gz | |
* m4/m4.m4 (AC_PROG_GNU_M4): Reject M4 1.4 through 1.4.4 as
broken.
* configure.ac: Update error message.
* NEWS: Note that M4 1.4.5 or later is now a hard dependency.
Reported by Gary Vaughan and Jim Meyering, and problem analyzed
by Stepan Kasal:
http://lists.gnu.org/archive/html/bug-autoconf/2006-11/msg00025.html
Diffstat (limited to 'm4/m4.m4')
| -rw-r--r-- | m4/m4.m4 | 18 |
1 files changed, 10 insertions, 8 deletions
@@ -1,22 +1,24 @@ -# m4.m4 serial 2 -dnl Copyright (C) 2000, 2006 Free Software Foundation, Inc. +# m4.m4 serial 3 +dnl Copyright (C) 2000, 2006, 2007 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. # AC_PROG_GNU_M4 # -------------- -# Check for GNU m4, at least 1.3 (supports frozen files). +# Check for GNU M4, at least 1.4.5 (all earlier versions had a bug in +# trace support: +# http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html) # Also, check whether --error-output (through 1.4.x) or --debugfile (2.0) # is supported, and AC_SUBST M4_DEBUGFILE accordingly. AC_DEFUN([AC_PROG_GNU_M4], [AC_PATH_PROGS([M4], [gm4 gnum4 m4], [m4]) -AC_CACHE_CHECK([whether m4 supports frozen files], [ac_cv_prog_gnu_m4], +AC_CACHE_CHECK([whether m4 supports accurate traces], [ac_cv_prog_gnu_m4], [ac_cv_prog_gnu_m4=no -if test x"$M4" != x; then - case `$M4 --help < /dev/null 2>&1` in - *reload-state*) ac_cv_prog_gnu_m4=yes ;; - esac +dnl Creative quoting here to avoid raw dnl and ifdef in configure. +if test x"$M4" != x \ + && test -z "`echo if'def(mac,bug)d'nl | $M4 --trace=mac 2>&1`" ; then + ac_cv_prog_gnu_m4=yes fi]) if test $ac_cv_prog_gnu_m4 = yes ; then AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile], |