http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32998
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-12 16:26:10 UTC --- Created attachment 24746 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24746 gcc47-pr32998.patch Untested patch to implement a new switch, -grecord-gcc-switches, which records passed options as a string appended to DW_AT_producer attribute in .debug_info. Apparently we aren't the first compiler to do that based on the dwarf2out.c comments... The main intent is to have the code generation options in there, as Roland said, -D* etc. options should be investigable through -g3 .debug_macinfo (especially if we manage to cut it down considerably), similarly -I/-i* etc. options related to preprocessing are either in .debug_macinfo and/or in .debug_line). If possible I'd like not to see filenames and paths in the string. I'm not entirely happy with it this way, as if passed command line options override each other, this approach will print all of them in the order specified (say -O2 -O3 -O0 inserts -O2 -O3 -O0 instead of just -O0) and due to the overriding the options can't be sorted, which would increase the likelyhood that the DW_AT_producer strings are mergeable between many object files. Joseph, is there a way to instead iterate over the explicitly passed options after override processing? I see global_options_set, but not sure what exactly to expect from it.
