https://bugzilla.suse.com/show_bug.cgi?id=1204697 https://bugzilla.suse.com/show_bug.cgi?id=1204697#c6 --- Comment #6 from Martin Li��ka <martin.liska@suse.com> --- (In reply to Egbert Eich from comment #5)
Ok, before we close this one, let's find an answer to this question:
Why are object files built with -flto=auto not reproducible?
Because the LTO bytecode lives in ELF sections that have a random identifier in them: marxin@marxinbox:~/Programming/testcases> echo '' > x.c && gcc -flto x.c -c && readelf -SW x.o | grep ipa_mod [ 6] .gnu.lto_.ipa_modref.6b4b5ae4355029d0 PROGBITS 0000000000000000 000062 000011 00 E 0 0 1 marxin@marxinbox:~/Programming/testcases> echo '' > x.c && gcc -flto x.c -c && readelf -SW x.o | grep ipa_mod [ 6] .gnu.lto_.ipa_modref.5d692f1a75e917f0 PROGBITS 0000000000000000 000062 000011 00 E 0 0 1 marxin@marxinbox:~/Programming/testcases> echo '' > x.c && gcc -flto x.c -c && readelf -SW x.o | grep ipa_mod [ 6] .gnu.lto_.ipa_modref.3690319a2a14ea9b PROGBITS 0000000000000000 000062 000011 00 E 0 0 1 marxin@marxinbox:~/Programming/testcases> echo '' > x.c && gcc -flto x.c -c && readelf -SW x.o | grep ipa_mod [ 6] .gnu.lto_.ipa_modref.77a516ac55937be3 PROGBITS 0000000000000000 000062 000011 00 E 0 0 1 It's because we want to prevent collisions where these object files are seen by a linker. -- You are receiving this mail because: You are on the CC list for the bug.