Hi I'm trying to add a check to my configure.ac to determine if clang is being used, I have the following: CLANG_CC= if test "$GCC" = yes; then if test "`$CC -v 2>&1 | grep -c 'clang version'`" != "0"; then CLANG_CC=1 fi fi And I'm trying to use AS_IF instead, I've been reading to documentation[1], and have come up with the following: AS_IF([test "$GCC" = yes],[ [AS_IF([test "`$CC -v 2>&1 | grep -c 'clang_version'`" != "0"],[CLANG_CC=1])], [CLANG_CC=]) but it doesn't seem to be working, whereas the version using if does. Therefore I must be incorrectly constructing the nested use of AS_IF. Can anyone spot what I'm doing wrong? Or know of a better way to check if clang is being used? Cheers Adam [1] <http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Common-Shell-Constructs.html> _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx https://lists.gnu.org/mailman/listinfo/autoconf