Turns out that a qemu-efi built by gcc master works in KVM mode. So I did some GCC bisecting to try and identify A) What change after GCC 6.2 made it start working again and B) What change occurred between GCC 5 and 6.2 that broke it to begin with.
A) What change after GCC 6.2 made it start working again? master started working again after: # first boots commit: [c76c65ae09761b460a9c015112ca03f34aab25ff] 2016-10-13 Richard Biener <rguent...@suse.de> I don't understand this change enough to know why it would have any effect, and it wasn't trivial enough for me to backport it to gcc-6 to test it on it's own. B) What change occurred between GCC 5 and 6.2 that broke it to begin with? The breakage started with: # first bad commit: [e57ef194b2cbbc8f178bdb6259e3bf3d2d4512e3] bb-reorder: Add -freorder-blocks-algorithm= and wire it up Based on that, I tried rebuilding qemu-efi with both -fno-reorder-blocks and -freorder-blocks-algorithm=stc. Both worked - so perhaps one of them is a better option than reverting to gcc-5. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1632875 Title: qemu-efi built w/ gcc-6 doesn't boot in KVM mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/1632875/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
