Hello Jirko, some nit picking:
Regarding your macro MY_CXX_OPTION, if you want to be really portable, things can get even more scary. See http://lists.gnu.org/archive/html/autoconf/2005-05/msg00109.html This will point you to latest sources in the 1.5.x branch of libtool. (The thread continues at http://lists.gnu.org/archive/html/autoconf/2005-06/msg00001.html ) On Thu, Jun 02, 2005 at 10:40:03PM +0200, Jirka Hanika wrote: > MY_CXX_OPTION(warnings, [warnings], [-Wall -w -enable-warnings-or-whatever]) MY_CXX_OPTION([warnings], [warnings], ...) all arguments have to be quoted. It's good rule to keep, at least when we educate beginners on this list. ;-) I think the definition of your macro can be improved. Here is the new version: AC_DEFUN([MY_CXX_OPTION], [AC_CACHE_CHECK([for $2], [epos_cv_cxx_opt_$1], [cat > conftest.cc <<EOF #include <stdio.h> int main(int argc, char **argv) { argc=argc; argv=argv; return 0; } EOF epos_cv_cxx_opt_$1=unknown for opt in $3; do ${CXX} ${opt} -o conftest conftest.cc 2>conftest2 1>&5 || continue msg=`cat conftest2` if test -z "$msg"; then epos_cv_cxx_opt_$1=$opt break fi done rm -f conftest conftest2 conftest.cc]) if test "x${epos_cv_cxx_opt_$1}" = xunknown; then $1= else $1=$epos_cv_cxx_opt_$1 fi]) Some of the changes are only my taste, but some are important: AC_DEFUN([MY_CXX_OPTION], -- quote the symbol, in case the definition is read twice. cmd 2>conftest2 always creates conftest2 You forgot to rm conftest.cc. test "x$epos_cv_cxx_opt_$1" = xunknown You have to prepend the "x", for portability, see the Autoconf manual. Have a nice day, Stepan Kasal
