projects / bison.git / blame
| Commit | Line | Data |
|---|---|---|
| dfff6628 | 1 | # m4.m4 serial 10 |
| b9ad39c1 | 2 | |
| 31f8b787 PE |
3 | # Copyright (C) 2000, 2006, 2007, 2008, 2009, 2010 Free Software |
| 4 | # Foundation, Inc. | |
| b9ad39c1 EB |
5 | |
| 6 | # Copying and distribution of this file, with or without modification, | |
| 7 | # are permitted in any medium without royalty provided the copyright | |
| 8 | # notice and this notice are preserved. This file is offered as-is, | |
| 9 | # without warranty of any kind. | |
| 0b3551fb | 10 | |
| 8ba62e3e JD |
11 | # AC_PROG_GNU_M4 |
| 12 | # -------------- | |
| b9ad39c1 EB |
13 | # Check for GNU M4, at least 1.4.6 (all earlier versions had bugs in |
| 14 | # trace support and regexp support): | |
| 15 | # http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html | |
| 16 | # http://lists.gnu.org/archive/html/bug-autoconf/2009-07/msg00023.html | |
| 8ba62e3e JD |
17 | # Also, check whether --error-output (through 1.4.x) or --debugfile (2.0) |
| 18 | # is supported, and AC_SUBST M4_DEBUGFILE accordingly. | |
| 19 | AC_DEFUN([AC_PROG_GNU_M4], | |
| b9ad39c1 | 20 | [AC_ARG_VAR([M4], [Location of GNU M4 1.4.6 or later. Defaults to the first |
| 8ba62e3e JD |
21 | program of `m4', `gm4', or `gnum4' on PATH that meets Autoconf needs.]) |
| 22 | AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4], | |
| 23 | [rm -f conftest.m4f | |
| b9ad39c1 EB |
24 | ac_had_posixly_correct=${POSIXLY_CORRECT:+yes} |
| 25 | AS_UNSET([POSIXLY_CORRECT]) | |
| 8ba62e3e JD |
26 | AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4], |
| 27 | [dnl Creative quoting here to avoid raw dnl and ifdef in configure. | |
| b9ad39c1 EB |
28 | # Root out GNU M4 1.4.5, as well as non-GNU m4 that ignore -t, -F. |
| 29 | ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)' | |
| 30 | ac_snippet=${ac_snippet}pat'subst(a,\(b\)\|\(a\),\1)d'nl | |
| 8ba62e3e | 31 | test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \ |
| dfff6628 | 32 | && test -z "`AS_ECHO([$ac_snippet]) | $ac_path_M4 --trace=mac 2>&1`" \ |
| 8ba62e3e JD |
33 | && test -f conftest.m4f \ |
| 34 | && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=: | |
| 35 | rm -f conftest.m4f], | |
| 36 | [AC_MSG_ERROR([no acceptable m4 could be found in \$PATH. | |
| b9ad39c1 | 37 | GNU M4 1.4.6 or later is required; 1.4.13 is recommended])])]) |
| 8ba62e3e | 38 | M4=$ac_cv_path_M4 |
| b9ad39c1 EB |
39 | AC_CACHE_CHECK([whether $ac_cv_path_M4 accepts --gnu], |
| 40 | [ac_cv_prog_gnu_m4_gnu], | |
| 41 | [case `$M4 --help < /dev/null 2>&1` in | |
| 42 | *--gnu*) ac_cv_prog_gnu_m4_gnu=yes ;; | |
| 43 | *) ac_cv_prog_gnu_m4_gnu=no ;; | |
| 44 | esac]) | |
| 45 | if test "$ac_cv_prog_gnu_m4_gnu" = yes; then | |
| 46 | M4_GNU=--gnu | |
| 47 | else | |
| 48 | M4_GNU= | |
| 49 | fi | |
| 50 | AC_SUBST([M4_GNU]) | |
| 51 | if test x$ac_had_posixly_correct = xyes; then | |
| 52 | POSIXLY_CORRECT=: | |
| 53 | if test $ac_cv_prog_gnu_m4_gnu = no; then | |
| 54 | AC_MSG_WARN([The version of M4 that was found does not support -g.]) | |
| 55 | AC_MSG_WARN([Using it with POSIXLY_CORRECT set may cause problems.]) | |
| 56 | fi | |
| 57 | fi | |
| 8ba62e3e JD |
58 | AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile], |
| 59 | [case `$M4 --help < /dev/null 2>&1` in | |
| 60 | *debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;; | |
| 61 | *) ac_cv_prog_gnu_m4_debugfile=--error-output ;; | |
| 62 | esac]) | |
| 63 | AC_SUBST([M4_DEBUGFILE], [$ac_cv_prog_gnu_m4_debugfile]) | |
| 64 | ]) | |
| 65 | ||
| 66 | # Compatibility for bootstrapping with Autoconf 2.61. | |
| 67 | dnl FIXME - replace this with AC_PREREQ([2.62]) after the release. | |
| 68 | # AC_PATH_PROGS_FEATURE_CHECK was added the same time the slightly broken, | |
| 69 | # undocumented _AC_PATH_PROG_FEATURE_CHECK was deleted. | |
| 70 | m4_ifndef([AC_PATH_PROGS_FEATURE_CHECK], | |
| 71 | [m4_define([AC_PATH_PROGS_FEATURE_CHECK], | |
| 72 | [_AC_PATH_PROG_FEATURE_CHECK([$1], [$2], [$3], [$5]) | |
| 73 | ])]) |