projects / bison.git / blame
| Commit | Line | Data |
|---|---|---|
| 8ba62e3e JD |
1 | # m4.m4 serial 5 |
| 2 | dnl Copyright (C) 2000, 2006, 2007, 2008 Free Software Foundation, Inc. | |
| 3 | dnl This file is free software; the Free Software Foundation | |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 0b3551fb | 6 | |
| 8ba62e3e JD |
7 | # AC_PROG_GNU_M4 |
| 8 | # -------------- | |
| 9 | # Check for GNU M4, at least 1.4.5 (all earlier versions had a bug in | |
| 10 | # trace support: | |
| 11 | # http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html) | |
| 12 | # Also, check whether --error-output (through 1.4.x) or --debugfile (2.0) | |
| 13 | # is supported, and AC_SUBST M4_DEBUGFILE accordingly. | |
| 14 | AC_DEFUN([AC_PROG_GNU_M4], | |
| 15 | [AC_ARG_VAR([M4], [Location of GNU M4 1.4.5 or later. Defaults to the first | |
| 16 | program of `m4', `gm4', or `gnum4' on PATH that meets Autoconf needs.]) | |
| 17 | AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4], | |
| 18 | [rm -f conftest.m4f | |
| 19 | AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4], | |
| 20 | [dnl Creative quoting here to avoid raw dnl and ifdef in configure. | |
| 21 | # Root out GNU M4 1.4.4, as well as non-GNU m4 that ignore -t, -F. | |
| 22 | ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)d'nl | |
| 23 | test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \ | |
| 24 | && test -z "`echo $ac_snippet | $ac_path_M4 --trace=mac 2>&1`" \ | |
| 25 | && test -f conftest.m4f \ | |
| 26 | && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=: | |
| 27 | rm -f conftest.m4f], | |
| 28 | [AC_MSG_ERROR([no acceptable m4 could be found in \$PATH. | |
| 29 | GNU M4 1.4.5 or later is required; 1.4.11 is recommended])])]) | |
| 30 | M4=$ac_cv_path_M4 | |
| 31 | AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile], | |
| 32 | [case `$M4 --help < /dev/null 2>&1` in | |
| 33 | *debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;; | |
| 34 | *) ac_cv_prog_gnu_m4_debugfile=--error-output ;; | |
| 35 | esac]) | |
| 36 | AC_SUBST([M4_DEBUGFILE], [$ac_cv_prog_gnu_m4_debugfile]) | |
| 37 | ]) | |
| 38 | ||
| 39 | # Compatibility for bootstrapping with Autoconf 2.61. | |
| 40 | dnl FIXME - replace this with AC_PREREQ([2.62]) after the release. | |
| 41 | # AC_PATH_PROGS_FEATURE_CHECK was added the same time the slightly broken, | |
| 42 | # undocumented _AC_PATH_PROG_FEATURE_CHECK was deleted. | |
| 43 | m4_ifndef([AC_PATH_PROGS_FEATURE_CHECK], | |
| 44 | [m4_define([AC_PATH_PROGS_FEATURE_CHECK], | |
| 45 | [_AC_PATH_PROG_FEATURE_CHECK([$1], [$2], [$3], [$5]) | |
| 46 | ])]) |