2008-04-03 03:21:33 +08:00
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# m4.m4 serial 5
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dnl Copyright (C) 2000, 2006, 2007, 2008 Free Software Foundation, Inc.
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2006-09-20 11:08:08 +08:00
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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* AUTHORS, BUGS, ChangeLog, ChangeLog.0, ChangeLog.1,
ChangeLog.2, GNUmakefile, Makefile.maint, NEWS, README,
README-alpha, TODO, configure.ac, lib/autoconf/Makefile.am,
m4/atconfig.m4, m4/init.m4, m4/m4.m4, m4/missing.m4,
m4/sanity.m4, tests/README, tests/aclocal.m4,
tests/atspecific.m4, tests/base.at, tests/compile.at,
tests/foreign.at, tests/m4sh.at, tests/m4sugar.at,
tests/semantics.at, tests/suite.at, tests/tools.at,
tests/torture.at: Add copyright notice.
* tests/mktests.sh: Update year in copyright notice.
2001-08-12 21:05:11 +08:00
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2000-05-23 22:46:23 +08:00
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# AC_PROG_GNU_M4
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# --------------
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2007-02-02 22:07:38 +08:00
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# Check for GNU M4, at least 1.4.5 (all earlier versions had a bug in
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# trace support:
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# http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html)
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2006-09-20 10:44:51 +08:00
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# Also, check whether --error-output (through 1.4.x) or --debugfile (2.0)
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# is supported, and AC_SUBST M4_DEBUGFILE accordingly.
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2000-05-23 22:46:23 +08:00
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AC_DEFUN([AC_PROG_GNU_M4],
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2007-09-08 22:48:49 +08:00
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[AC_ARG_VAR([M4], [Location of GNU M4 1.4.5 or later. Defaults to the first
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program of `m4', `gm4', or `gnum4' on PATH that meets Autoconf needs.])
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AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4],
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2007-10-18 07:09:14 +08:00
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[rm -f conftest.m4f
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AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4],
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2007-09-08 22:48:49 +08:00
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[dnl Creative quoting here to avoid raw dnl and ifdef in configure.
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2007-10-18 07:09:14 +08:00
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# Root out GNU M4 1.4.4, as well as non-GNU m4 that ignore -t, -F.
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2007-10-02 06:22:54 +08:00
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ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)d'nl
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2007-10-18 07:09:14 +08:00
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test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \
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&& test -z "`echo $ac_snippet | $ac_path_M4 --trace=mac 2>&1`" \
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&& test -f conftest.m4f \
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&& ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
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rm -f conftest.m4f],
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[AC_MSG_ERROR([no acceptable m4 could be found in \$PATH.
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GNU M4 1.4.5 or later is required; 1.4.11 is recommended])])])
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2007-09-08 22:48:49 +08:00
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M4=$ac_cv_path_M4
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2006-09-20 10:44:51 +08:00
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AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile],
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2007-09-08 22:48:49 +08:00
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[case `$M4 --help < /dev/null 2>&1` in
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*debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;;
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*) ac_cv_prog_gnu_m4_debugfile=--error-output ;;
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esac])
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AC_SUBST([M4_DEBUGFILE], [$ac_cv_prog_gnu_m4_debugfile])
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2006-09-20 10:44:51 +08:00
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])
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2007-09-08 22:48:49 +08:00
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# Compatibility for bootstrapping with Autoconf 2.61.
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dnl FIXME - replace this with AC_PREREQ([2.62]) after the release.
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# AC_PATH_PROGS_FEATURE_CHECK was added the same time the slightly broken,
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# undocumented _AC_PATH_PROG_FEATURE_CHECK was deleted.
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m4_ifndef([AC_PATH_PROGS_FEATURE_CHECK],
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[m4_define([AC_PATH_PROGS_FEATURE_CHECK],
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[_AC_PATH_PROG_FEATURE_CHECK([$1], [$2], [$3], [$5])
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])])
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