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Diffstat (limited to 'm4/ax_prog_flex.m4')
| -rw-r--r-- | m4/ax_prog_flex.m4 | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/m4/ax_prog_flex.m4 b/m4/ax_prog_flex.m4 new file mode 100644 index 0000000..0b734ea --- /dev/null +++ b/m4/ax_prog_flex.m4 @@ -0,0 +1,62 @@ +# =========================================================================== +# http://autoconf-archive.cryp.to/ax_prog_flex.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_PROG_FLEX(ACTION-IF-TRUE,ACTION-IF-FALSE) +# +# DESCRIPTION +# +# Check whether flex is the scanner generator. Run ACTION-IF-TRUE if +# successful, ACTION-IF-FALSE otherwise +# +# LICENSE +# +# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net> +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General +# Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program. If not, see <http://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +AC_DEFUN([AX_PROG_FLEX], [ + AC_REQUIRE([AM_PROG_LEX]) + AC_REQUIRE([AC_PROG_SED]) + + AC_CACHE_CHECK([if flex is the lexer generator],[ax_cv_prog_flex],[ + AS_IF([test "`echo \"$LEX\" | $SED 's,^.*\(flex\).*$,\1,'`" = "flex"],[ + ax_cv_prog_flex=yes + ],[ + ax_cv_prog_flex=no + ]) + ]) + AS_IF([test "$ax_cv_prog_flex" = yes],[ + : + $1 + ],[ + : + $2 + ]) +]) |