Public bug reported: Hi, I've happened to find this breaking a qemu build that was breaking like:
c -MMD -MP -MT linuxboot_dma.o -MF ./linuxboot_dma.d -O2 -g -march=i486 -Wall -Wstrict-prototypes -Wredundant-decls -Wundef -Wwrite-strings -Wmissing-prototypes -Wformat -Werror=format-security -Wdate-time -Wold-style-declaration -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels -Wexpansion-to-defined -Wimplicit-fallthrough=2 -Wno-missing-include-dirs -Wno-shift-negative-value -Wno-psabi -fno-pie -ffreestanding -I/<<PKGBUILDDIR>>/pc-bios/optionrom//../../include -fno-stack-protector -m16 -Wa,-32 -c /<<PKGBUILDDIR>>/pc-bios/optionrom/linuxboot_dma.c -o linuxboot_dma.o cc1: error: ‘-fcf-protection’ is not compatible with this target As usual this looks complex but it can be reduced to your favorite C hello world. It should work if you build it with: $ cc -Wall -Werror test.c -o test.o But the following will fail: $ cc -Wall -Werror -march=i486 -m16 test.c -o test.o cc1: error: ‘-fcf-protection’ is not compatible with this target This is some of the always crazy boot blobs that virtualization needs here and there - and I hope I can resolve it for qemu in the build. But in general while I think the fcf default (https://wiki.ubuntu.com/ToolChain/CompilerFlags#A-fcf-protection) is ok, it should not be default on arch combinations where it can never work. ** Affects: gcc-11 (Ubuntu) Importance: Undecided Status: New ** Affects: qemu (Ubuntu) Importance: Undecided Status: New ** Also affects: qemu (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1940029 Title: Default of fcf-protection should only be enabled where it can work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-11/+bug/1940029/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
