[Bug 1892205] Re: tcgbios.c:1519:33: error: taking address of packed member of ‘struct ’ may result in an unaligned pointer value [-Werror=address-of-packed-member]

[Marietto]

** Package changed: ubuntu => gcc-9 (Ubuntu)

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Title:
   tcgbios.c:1519:33: error: taking address of packed member of ‘struct
  ’ may result in an unaligned pointer value [-Werror=address-of-packed-
  member]

Status in gcc-9 package in Ubuntu:
  New

Bug description:
  Hello. I was trying to compile the xen tools for enabling GVT for my integrated intel gpu
  with xen and the compilation stopped like this :

  gcc -m32 -march=i686 -DBUILD_ID -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes -Wdeclaration-after-statement -Wno-unused-but-set-variable -Wno-unused-local-typedefs -O2 -fomit-frame-pointer -D__XEN_INTERFACE_VERSION__=XEN_LATEST_INTERFACE_VERSION -MMD -MF .tcgbios.o.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -mno-tls-direct-seg-refs -DNDEBUG -Werror -fno-stack-protector -fno-exceptions -fno-builtin -msoft-float -I/etc/xen/igvtg-xen/tools/firmware/rombios/32bit/tcgbios/../../../../../tools/include -I.. -I../.. -I../../../../libacpi -fno-pic -fno-PIE -c -o tcgbios.o tcgbios.c
  tcgbios.c: In function ‘TCGInterruptHandler’:
  tcgbios.c:1519:33: error: taking address of packed member of ‘struct ’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
  1519 | &regs->u.r32.edx);
  | ^~~~~~~~~~~~~~~~
  cc1: all warnings being treated as errors

  I see that thig bug has been discussed here :

  https://bugs.gentoo.org/689082

  and resolved here :

  https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c58b86194ce19d54a2f47d4712cb237b1f880ebb

  but on gentoo ! basically I don't know if (and how) I can fix this
  error on ubuntu 20.04. I don't know if I can use the patches suggested
  on the gentoo gitweb also on ubuntu 20.04.

  You can find the discussion here : https://github.com/intel/gvt-
  linux/issues/168

  I'm using GCC version 9.

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