I've just installed a number of patches to var-tracking-assignments-branch and var-tracking-assignments-4_3-branch, which bring them to passing compare-debug for all object files in both the bootstrapped compiler and the target libraries on x86_64-linux-gnu, i686-linux-gnu and ppc64-linux-gnu with -O1, -O2 and -O3 in BOOT_CFLAGS.
I'm very happy to report that I could debug all of the most recent errors using a stage3 compiler built with -O3 -g (-fvar-tracking-assignments defaults to enabled with -g in the branches), along with GDB as in Fedora development, with support for debugging inlined functions (thanks, Jan!) Debug info still doesn't account for all possible locations of variables, and it still doesn't support constants in location lists, but it's possible to inspect most live variables otherwise. Having completed the post-merge stabilization, I'll now go back to the project of creating guality testcases, along the lines proposed at http://gcc.gnu.org/ml/gcc/2008-07/msg00591.html At some point I'll proceed to implement meaningful is_stmt dwarf markers for .loc directives, which should enable the implementation of the final stage of guality tests, avoiding any interference with the generated code. http://gcc.gnu.org/ml/gcc-patches/2008-08/msg00757.html I also have some thoughts on introducing an option for GCC to verify that a translation unit produces the same code when compiled with and without debug info, to be used by make check and by vta testers. Meanwhile, I'm ready to start tackling reports about: - bootstrap-debug, bootstrap4-debug or any compare-debug failures on your favorite native or cross platforms; - compilation errors with vta enabled; and - unmet debug info expectations, such as variables that must have available values at certain points in the program, but that don't, according to debug info. Thanks in advance, -- Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/ Free Software Evangelist [EMAIL PROTECTED], gnu.org} FSFLA Board Member ¡Sé Libre! => http://www.fsfla.org/ Red Hat Compiler Engineer [EMAIL PROTECTED], gcc.gnu.org}
