Download M4 Source | Macro History | Category Index |
AX_PROG_PERL_VERSION([VERSION],[ACTION-IF-TRUE],[ACTION-IF-FALSE])
Makes sure that perl 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 $PERL is not set (for example by running AC_CHECK_PROG or AC_PATH_PROG) the macro will fail.
Example:
AC_PATH_PROG([PERL],[perl]) AX_PROG_PERL_VERSION([5.8.0],[ ... ],[ ... ])
This will check to make sure that the perl you have supports at least version 5.8.0.
NOTE: This macro uses the $PERL variable to perform the check. AX_WITH_PERL can be used to set that variable prior to running this macro. The $PERL_VERSION variable will be valorized with the detected version.
Francesco Salvestrini <salvestrini@users.sourceforge.net>
2008-12-25
AC_DEFUN([AX_PROG_PERL_VERSION],[ AC_REQUIRE([AC_PROG_SED]) AC_REQUIRE([AC_PROG_GREP]) AS_IF([test -n "$PERL"],[ ax_perl_version="$1" AC_MSG_CHECKING([for perl version]) changequote(<<,>>) perl_version=`$PERL --version 2>&1 | $GREP "This is perl" | $SED -e 's/.* v\([0-9]*\.[0-9]*\.[0-9]*\) .*/\1/'` changequote([,]) AC_MSG_RESULT($perl_version) AC_SUBST([PERL_VERSION],[$perl_version]) AX_COMPARE_VERSION([$ax_perl_version],[le],[$perl_version],[ : $2 ],[ : $3 ]) ],[ AC_MSG_WARN([could not find the perl interpreter]) $3 ]) ])
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.