Build fails on optionrom

[Benjamin Kamath]

Git pseudo-bisected (focused on optionrom commits) it to this commit.

commit cdbd727c20ad7aac7797dc8c95e485e1a4c6901b
Author: Richard Henderson <email address hidden>
Date: Thu Jul 7 21:49:36 2016 -0700

    build: Use $(AS) for optionrom explicitly

Build output (non-verbose):

  AS optionrom/linuxboot.o
cpp: fatal error: '-c' is not a valid option to the preprocessor
compilation terminated.
cpp: fatal error: '-c' is not a valid option to the preprocessor
compilation terminated.
  CC optionrom/linuxboot_dma.o
  CC /home/bkamath/dev/workspace/block-2/mothra/output/sp0/targetqga/main.o
  AS optionrom/kvmvapic.o
cpp: fatal error: '-c' is not a valid option to the preprocessor
compilation terminated.

Steps to reproduce:
Using buildroot and overriding qemu version to 2.7.0
Fedora 24, cpp (GCC) 6.2.1 20160916 (Red Hat 6.2.1-2)

I tried first just building without the -c option but it hangs indefinitely. Reverting the above listed commit fixes the problem on my platform. I didn't dive much further into this, because this seems like a regression.

[David (dkerr64)]

I am seeing the same problem. Cross compiling QEMU 2.7 using buildroot get fatal error -c is not a valid option. As Benjamin states removing the -c flag from Makefile gets through the compile, but when booting a virtual image of Ubuntu 16.04 the network does not come up (console is live and you can login through the console, but the only network interface is loopback) I have not diagnosed further.

I was not able to simply back out the optionrom commit Benjamin cites... caused problems elsewhere, perhaps because I was not doing it right. Reverting to QEMU 2.6.2 does work.

David

[Thomas Huth (th-huth)]

Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? Or could we close this ticket nowadays?

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]