[Qemu-devel] [Bug 1813010] Re: Parallel builds fail (make -j >=2)

[Alex Bennée]

It seems the --save-temps is what breaks things for me, the following
works:

  ../qemu.git/configure --target-list=riscv64-softmmu --enable-debug
--extra-cflags="-O0 -g3" && make -j9

rm -rf and start again with:

  ../qemu.git/configure --target-list=riscv64-softmmu --enable-debug
--extra-cflags="-O0 -g3 --save-temps"

falls over with lines like:

  block/trace.h: In function ‘_nocheck__trace_nbd_co_request_fail’:
block/trace.h:3141:73: error: ‘_TRACE_NBD_CO_REQUEST_FAIL_DSTATE’ undeclared 
(first use in this function); did you mean 
‘TRACE_NBD_CO_REQUEST_FAIL_BACKEND_DSTATE’?
     if (trace_event_get_state(TRACE_NBD_CO_REQUEST_FAIL) && 
qemu_loglevel_mask(LOG_TRACE)) {
                                                                         
^~~~~~~~~~~~~~~~~~~~
                                                                         
TRACE_NBD_CO_REQUEST_FAIL_BACKEND_DSTATE

which implies something getting in the way of making the trace files.


** Summary changed:

- Parallel builds fail (make -j >=2)
+ Parallel builds fail (make -j >=2) when using --extrac-cflags "--save-temps"

** Summary changed:

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

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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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