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# m4.m4 serial 12
# Copyright (C) 2000, 2006-2014 Free Software Foundation, Inc.
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without warranty of any kind.
# AC_PROG_GNU_M4
# --------------
# Check for GNU M4, at least 1.4.6 (all earlier versions had bugs in
# trace support and regexp support):
# http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html
# http://lists.gnu.org/archive/html/bug-autoconf/2009-07/msg00023.html
# Also, check whether --error-output (through 1.4.x) or --debugfile (2.0)
# is supported, and AC_SUBST M4_DEBUGFILE accordingly.
# Also avoid versions of m4 that trigger strstr bugs.
AC_DEFUN([AC_PROG_GNU_M4],
[AC_ARG_VAR([M4], [Location of GNU M4 1.4.6 or later. Defaults to the first
program of 'm4', 'gm4', or 'gnum4' on PATH that meets Autoconf needs.])
AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4],
[rm -f conftest.m4f
ac_had_posixly_correct=${POSIXLY_CORRECT:+yes}
AS_UNSET([POSIXLY_CORRECT])
AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4],
[dnl Creative quoting here to avoid raw dnl and ifdef in configure.
# Root out GNU M4 1.4.5, as well as non-GNU m4 that ignore -t, -F.
# Root out GNU M4 1.4.15 with buggy false negative replacement strstr.
# Root out Glibc 2.9 - 2.12 and GNU M4 1.4.11 - 1.4.15 with buggy
# false positive strstr.
ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)'
ac_snippet=${ac_snippet}pat'subst(a,\(b\)\|\(a\),\1)d'nl
ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(..wi.d.,.d.),-1,bug)'
ac_snippet=${ac_snippet}${as_nl}if'else(in''dex(dnl
;:11-:12-:12-:12-:12-:12-:12-:12-:12.:12.:12.:12.:12.:12.:12.:12.:12-,dnl
:12-:12-:12-:12-:12-:12-:12-:12-),-1,,strstr-bug2)'
test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \
&& test -z "`AS_ECHO([$ac_snippet]) | $ac_path_M4 --trace=mac 2>&1`" \
&& test -f conftest.m4f \
&& ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
rm -f conftest.m4f],
[AC_MSG_ERROR([no acceptable m4 could be found in \$PATH.
GNU M4 1.4.6 or later is required; 1.4.16 or newer is recommended.
GNU M4 1.4.15 uses a buggy replacement strstr on some systems.
Glibc 2.9 - 2.12 and GNU M4 1.4.11 - 1.4.15 have another strstr bug.])])])
M4=$ac_cv_path_M4
AC_CACHE_CHECK([whether $ac_cv_path_M4 accepts --gnu],
[ac_cv_prog_gnu_m4_gnu],
[case `$M4 --help < /dev/null 2>&1` in
*--gnu*) ac_cv_prog_gnu_m4_gnu=yes ;;
*) ac_cv_prog_gnu_m4_gnu=no ;;
esac])
if test "$ac_cv_prog_gnu_m4_gnu" = yes; then
M4_GNU=--gnu
else
M4_GNU=
fi
AC_SUBST([M4_GNU])
if test x$ac_had_posixly_correct = xyes; then
POSIXLY_CORRECT=:
if test $ac_cv_prog_gnu_m4_gnu = no; then
AC_MSG_WARN([the version of M4 that was found does not support -g])
AC_MSG_WARN([using it with POSIXLY_CORRECT set may cause problems])
fi
fi
AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile],
[case `$M4 --help < /dev/null 2>&1` in
*debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;;
*) ac_cv_prog_gnu_m4_debugfile=--error-output ;;
esac])
AC_SUBST([M4_DEBUGFILE], [$ac_cv_prog_gnu_m4_debugfile])
])
# Compatibility for bootstrapping with Autoconf 2.61.
dnl FIXME - replace this with AC_PREREQ([2.62]) after the release.
# AC_PATH_PROGS_FEATURE_CHECK was added the same time the slightly broken,
# undocumented _AC_PATH_PROG_FEATURE_CHECK was deleted.
m4_ifndef([AC_PATH_PROGS_FEATURE_CHECK],
[m4_define([AC_PATH_PROGS_FEATURE_CHECK],
[_AC_PATH_PROG_FEATURE_CHECK([$1], [$2], [$3], [$5])
])])
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