https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101574
--- Comment #2 from Thomas Schwinge <tschwinge at gcc dot gnu.org> --- Created attachment 51194 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51194&action=edit Valgrind log For both the non-working (offloading-disabled) and working (offloading-enabled) builds I'm using the same flags: '--prefix= --enable-languages=all --enable-werror --enable-checking=yes,extra,rtl', and 'CC=gcc-4.8 CXX=g++-4.8' ("gcc-4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4"), and some '--with-[...]' for host libraries. The offloading-enabled build additionally has '--enable-offload-targets=[...] --with-cuda-driver[...]' (shouldn't be relevant here). The stage 2 command line for 'lra-lives.o' is identical for the working vs. non-working builds. I can reliably reproduce the 'lra-lives.o' error by re-running 'make', and also by manually running the command inside 'build-gcc/gcc/'. Running the latter with '-wrapper valgrind' ("valgrind-3.10.1", sorry) added, I see a number of "Conditional jump or move depends on uninitialised value(s)", "Use of uninitialised value of size [...]"! First one: Conditional jump or move depends on uninitialised value(s) at 0x149106D: sparseset_bit_p(sparseset_def*, unsigned int) (sparseset.h:146) by 0x1491B1D: mark_pseudo_regno_live(int) (ira-lives.c:326) by 0x1491DD2: mark_pseudo_reg_live(rtx_def*, unsigned int) (ira-lives.c:410) by 0x1491E7F: mark_ref_live(df_ref_d*) (ira-lives.c:424) by 0x1495444: process_bb_node_lives(ira_loop_tree_node*) (ira-lives.c:1434) by 0x1464EA2: ira_traverse_loop_tree(bool, ira_loop_tree_node*, void (*)(ira_loop_tree_node*), void (*)(ira_loop_tree_node*)) (ira-build.c:1801) by 0x14962BC: ira_create_allocno_live_ranges() (ira-lives.c:1735) by 0x1469B40: ira_build() (ira-build.c:3428) by 0x145EEF5: ira(_IO_FILE*) (ira.c:5752) by 0x145F984: (anonymous namespace)::pass_ira::execute(function*) (ira.c:6075) by 0x16166AB: execute_one_pass(opt_pass*) (passes.c:2567) by 0x16169E1: execute_pass_list_1(opt_pass*) (passes.c:2656) See log file I'm attaching.
