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AX_PROG_RUBY_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
Makes sure that ruby supports the version indicated. If true the shell commands in ACTION-IF-TRUE are executed. If not the shell commands in ACTION-IF-FALSE are run. Note if $RUBY is not set (for example by running AC_CHECK_PROG or AC_PATH_PROG) the macro will fail.
Example:
AC_PATH_PROG([RUBY],[ruby]) AC_PROG_RUBY_VERSION([1.8.0],[ ... ],[ ... ])
This will check to make sure that the ruby you have supports at least version 1.6.0.
NOTE: This macro uses the $RUBY variable to perform the check. AX_WITH_RUBY can be used to set that variable prior to running this macro. The $RUBY_VERSION variable will be valorized with the detected version.
Francesco Salvestrini <salvestrini@users.sourceforge.net>
2008-04-12
AC_DEFUN([AX_PROG_RUBY_VERSION],[ AC_REQUIRE([AC_PROG_SED]) AC_REQUIRE([AC_PROG_GREP]) AS_IF([test -n "$RUBY"],[ ax_ruby_version="$1" AC_MSG_CHECKING([for ruby version]) changequote(<<,>>) ruby_version=`$RUBY --version 2>&1 | $GREP "^ruby " | $SED -e 's/^.* \([0-9]*\.[0-9]*\.[0-9]*\) .*/\1/'` changequote([,]) AC_MSG_RESULT($ruby_version) AC_SUBST([RUBY_VERSION],[$ruby_version]) AX_COMPARE_VERSION([$ax_ruby_version],[le],[$ruby_version],[ : $2 ],[ : $3 ]) ],[ AC_MSG_WARN([could not find the ruby interpreter]) $3 ]) ])
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