| 1 | # m4.m4 serial 2
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| 2 | dnl Copyright (C) 2000, 2006 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # AC_PROG_GNU_M4
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| 8 | # --------------
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| 9 | # Check for GNU m4, at least 1.3 (supports frozen files).
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| 10 | # Also, check whether --error-output (through 1.4.x) or --debugfile (2.0)
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| 11 | # is supported, and AC_SUBST M4_DEBUGFILE accordingly.
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| 12 | AC_DEFUN([AC_PROG_GNU_M4],
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| 13 | [AC_PATH_PROGS([M4], [gm4 gnum4 m4], [m4])
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| 14 | AC_CACHE_CHECK([whether m4 supports frozen files], [ac_cv_prog_gnu_m4],
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| 15 | [ac_cv_prog_gnu_m4=no
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| 16 | if test x"$M4" != x; then
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| 17 | case `$M4 --help < /dev/null 2>&1` in
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| 18 | *reload-state*) ac_cv_prog_gnu_m4=yes ;;
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| 19 | esac
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| 20 | fi])
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| 21 | if test $ac_cv_prog_gnu_m4 = yes ; then
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| 22 | AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile],
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| 23 | [case `$M4 --help < /dev/null 2>&1` in
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| 24 | *debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;;
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| 25 | *) ac_cv_prog_gnu_m4_debugfile=--error-output ;;
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| 26 | esac])
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| 27 | AC_SUBST([M4_DEBUGFILE], $ac_cv_prog_gnu_m4_debugfile)
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| 28 | fi
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| 29 | ])
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