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Diffstat (limited to 'm4/ax_prog_flex_version.m4')
| -rw-r--r-- | m4/ax_prog_flex_version.m4 | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/m4/ax_prog_flex_version.m4 b/m4/ax_prog_flex_version.m4 new file mode 100644 index 00000000..1048e627 --- /dev/null +++ b/m4/ax_prog_flex_version.m4 @@ -0,0 +1,66 @@ +# =========================================================================== +# https://www.gnu.org/software/autoconf-archive/ax_prog_flex_version.html +# =========================================================================== +# +# SYNOPSIS +# +# AX_PROG_FLEX_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE]) +# +# DESCRIPTION +# +# Makes sure that flex version is greater or equal to the version +# indicated. If true the shell commands in ACTION-IF-TRUE are executed. If +# not the shell commands in commands in ACTION-IF-TRUE are executed. If +# not the shell commands in ACTION-IF-FALSE are run. Note if $FLEX is not +# set (for example by running AC_CHECK_PROG or AC_PATH_PROG) the macro +# will fail. +# +# Example: +# +# AC_PATH_PROG([FLEX],[flex]) +# AX_PROG_FLEX_VERSION([2.5.39],[ ... ],[ ... ]) +# +# This will check to make sure that the flex you have is at least version +# 2.5.39 or greater. +# +# NOTE: This macro uses the $FLEX variable to perform the check. +# +# LICENSE +# +# Copyright (c) 2015 Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com> +# +# Copying and distribution of this file, with or without modification, are +# permitted in any medium without royalty provided the copyright notice +# and this notice are preserved. This file is offered as-is, without any +# warranty. + +#serial 2 + +AC_DEFUN([AX_PROG_FLEX_VERSION],[ + AC_REQUIRE([AC_PROG_SED]) + AC_REQUIRE([AC_PROG_GREP]) + + AS_IF([test -n "$FLEX"],[ + ax_flex_version="$1" + + AC_MSG_CHECKING([for flex version]) + changequote(<<,>>) + flex_version=`$FLEX --version 2>&1 \ + | $SED -n -e '/flex /s/.* (\{0,1\}\([0-9]*\.[0-9]*\.[0-9]*\))\{0,1\}.*/\1/;p'` + changequote([,]) + AC_MSG_RESULT($flex_version) + + AC_SUBST([FLEX_VERSION],[$flex_version]) + + AX_COMPARE_VERSION([$flex_version],[ge],[$ax_flex_version],[ + : + $2 + ],[ + : + $3 + ]) + ],[ + AC_MSG_WARN([could not find flex]) + $3 + ]) +]) |