Up until http://gcc.gnu.org/viewcvs?view=revision&revision=163770, you could have a line like this in the gcc driver spec file: cc1: %(cc1_cpu) %{profile:-p} %{DFOO: -foo} This would detect if -DFOO was given on the driver command line and would pass in -foo to cc1. However, after r163770 this stopped working. Is there a way to do this using current trunk (i.e., add a flag to a tool if a particular define is present on the gcc driver command line)? Was the old way broken or was there a bug introduced with revision r163770? Here is a small test script to test a gcc driver binary to see if it supports specfile modification like the above. This script returns 0 at revision r163770 and returns 1 before that (-foo is not passed to cc1 at that revision and beyond). Use it like: $script_file <path_to_gcc_driver_binary> #!/bin/bash my_gcc=$1 specs=$($my_gcc -dumpspecs) new_specs=$(echo "$specs" | sed -e '/cc1:/,+1 {/cc1:/b; s/$/ %{DFOO: -foo}/}') new_specs_file=$(mktemp) echo "$new_specs" > $new_specs_file echo 'int main(){return 0;}' | $my_gcc -specs $new_specs_file -o /dev/null -v -DFOO -x c - exit $?
