64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_prog_flex.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_PROG_FLEX(ACTION-IF-TRUE,ACTION-IF-FALSE)
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#
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# DESCRIPTION
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#
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# Check whether flex is the scanner generator. Run ACTION-IF-TRUE if
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# successful, ACTION-IF-FALSE otherwise
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#
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# LICENSE
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#
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# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
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# Copyright (c) 2010 Diego Elio Petteno` <flameeyes@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 12
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# mattst88:
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# Replaced m4_ifnblank(...) with m4_ifval(m4_normalize(...), ...)
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# since m4_ifnblank requires autoconf-2.64.
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AC_DEFUN([AX_PROG_FLEX], [
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AC_REQUIRE([AM_PROG_LEX])
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AC_REQUIRE([AC_PROG_EGREP])
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AC_CACHE_CHECK([if flex is the lexer generator],[ax_cv_prog_flex],[
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AS_IF([$LEX --version 2>/dev/null | $EGREP -qw '^g?flex'],
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[ax_cv_prog_flex=yes], [ax_cv_prog_flex=no])
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])
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AS_IF([test "$ax_cv_prog_flex" = "yes"],
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m4_ifval(m4_normalize([$1]), [[$1]]),
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m4_ifval(m4_normalize([$2]), [[$2]])
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)
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])
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