[Bug 1883560] Re: mips linux-user builds occasionly crash randomly only to be fixed by a full clean re-build

[Laurent Vivier]

Aleksandar, Alex, see comment #1.

I think the problem happens because I moved the syscall_nr.h from source
directory to build directory. If source directory is not cleaned up
correctly, the build will not generate the new header in the build
directory but in source directory and some targets that need 32bit,
64bit or a new API will only use the first one generated (as in this
case they are all at the same place).

See the following PR:
https://patchew.org/QEMU/20200316161550.336150-1-laurent@vivier.eu/

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https://bugs.launchpad.net/bugs/1883560

Title:
  mips linux-user builds occasionly crash randomly only to be fixed by a
  full clean re-build

Status in QEMU:
  New

Bug description:
  From time to time I find check-tcg crashes with a one of the MIPS
  binaries. The last time it crashed was running the test:

    ./mips64el-linux-user/qemu-mips64el ./tests/tcg/mips64el-linux-
  user/threadcount

  Inevitably after some time noodling around wondering what could be
  causing this weird behaviour I wonder if it is a build issue. I wipe
  all the mips* build directories, re-run configure and re-build and
  voila problem goes away.

  It seems there must be some sort of build artefact which isn't being
  properly re-generated on a build update which causes weird problems.
  Additional data point if I:

    rm -rf mips64el-linux-user
    ../../configure
    make

  then I see failures in mip32 builds - eg:

      GEN     mipsn32el-linux-user/config-target.h
    In file included from /home/alex/lsrc/qemu.git/linux-user/syscall_defs.h:10,
                     from /home/alex/lsrc/qemu.git/linux-user/qemu.h:16,
                     from /home/alex/lsrc/qemu.git/linux-user/linuxload.c:5:
    /home/alex/lsrc/qemu.git/linux-user/mips64/syscall_nr.h:1: error: 
unterminated #ifndef
     #ifndef LINUX_USER_MIPS64_SYSCALL_NR_H

    make[1]: *** [/home/alex/lsrc/qemu.git/rules.mak:69: 
linux-user/linuxload.o] Error 1
    make[1]: *** Waiting for unfinished jobs....

  which implies there is a cross dependency between different targets
  somewhere. If I executed:

    rm -rf mips*

  before re-configuring and re-building then everything works again.

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