[Qemu-devel] [Bug 1824528] Re: qemu fails to compile on gcc 9 `error: taking address of packed member of ‘struct <anonymous>’ may result in an unaligned pointer value [-Werror=address-of-packed-member]`

[Peter Maydell]

As a workaround, the simplest thing is to configure with --disable-
werror, which will reduce these from errors to warnings. (This is the
default if you're building from one of our release tarballs, but for
builds from git we default to making all warnings into errors so we
catch and fix them quickly.)

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https://bugs.launchpad.net/bugs/1824528

Title:
  qemu fails to compile on gcc 9 `error: taking address of packed member
  of ‘struct <anonymous>’ may result in an unaligned pointer value
  [-Werror=address-of-packed-member]`

Status in QEMU:
  New

Bug description:
  Qemu compilation fails with below error on ppc64le host with gcc 9(9.0.1 
20190328)
  repo: https://github.com/qemu/qemu.git
  branch: master
  commit e1be98540ee672ef93292b65a986055512237c35

  
    CC      net/dump.o
  hw/usb/dev-mtp.c: In function ‘usb_mtp_write_metadata’:
  hw/usb/dev-mtp.c:1708:36: error: taking address of packed member of ‘struct 
<anonymous>’ may result in an unaligned pointer value 
[-Werror=address-of-packed-member]
   1708 |                             dataset->filename);
        |                             ~~~~~~~^~~~~~~~~~
  cc1: all warnings being treated as errors
    CC      net/eth.o
  make: *** [/home/kvmci/qemu-main/rules.mak:69: hw/usb/dev-mtp.o] Error 1
  make: *** Waiting for unfinished jobs....
    CC      net/announce.o

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