[Qemu-devel] [Bug 1813010] Re: Parallel builds fail (make -j >=2) when using --extra-cflags "--save-temps"

[Alex Bennée]

A workaround for this is to use "-save-temps=obj" which ensures the
temps are dumped in the object directory. I suspect there is a clash
somewhere between what save temps dumps and some of the files we
generate for tracing.

** Changed in: qemu
       Status: New => Confirmed

** Tags added: build make workaround

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https://bugs.launchpad.net/bugs/1813010

Title:
  Parallel builds fail (make -j >=2) when using --extra-cflags "--save-
  temps"

Status in QEMU:
  Confirmed

Bug description:
  specs:
  QEMU commit: 9f33051abce238ab43a23125e237aac8b0931b88
  # of Cores: 8
  Host kernel: Linux 4.19.16-1-lts
  Host type: x86_64 GNU/Linux
  Host distro: Archlinux
  Guest: we never get that far

  
  steps:
  # fresh copy of the latest commit
  > git clone https://git.qemu.org/git/qemu.git

  # separate build dir
  > mkdir build
  > cd build

  # sample configuration for riscv (this happens for other targets as well)
  > ../qemu/configure --target-list=riscv64-softmmu --enable-debug 
--extra-cflags='-O0 -g3 -save-temps' --prefix=/install/riscv-qemu

  # this will fail (see attached log file)
  > make -j 2

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