diff options
Diffstat (limited to 'm4/m4.m4')
-rw-r--r-- | m4/m4.m4 | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/m4/m4.m4 b/m4/m4.m4 new file mode 100644 index 0000000..a19af67 --- /dev/null +++ b/m4/m4.m4 @@ -0,0 +1,82 @@ +# m4.m4 serial 12 + +# Copyright (C) 2000, 2006-2012 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]) +])]) |