[Bug 856839] Re: libglib2.0-0 fails to build using dpkg-buildpackage when added "-flto" to CFLAGS and LDFLAGS

[Julian Taylor]

** Attachment added: "buildlog with -flto -U_FORTIFY_SOURCE"
   https://bugs.launchpad.net/ubuntu/+source/binutils/+bug/856839/+attachment/2443198/+files/glib-default%2Blto%2Bnofortify.log

** Package changed: binutils (Ubuntu) => glib2.0 (Ubuntu)

** Also affects: binutils (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gcc-4.6 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: glib2.0 (Ubuntu)
   Importance: Undecided => Low

** Changed in: gcc-4.6 (Ubuntu)
   Importance: Undecided => Low

** Changed in: binutils (Ubuntu)
   Importance: Undecided => Low

** Changed in: binutils (Ubuntu)
       Status: New => Confirmed

** Changed in: gcc-4.6 (Ubuntu)
       Status: New => Confirmed

** Changed in: glib2.0 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/856839

Title:
  libglib2.0-0 fails to build using dpkg-buildpackage when added "-flto"
  to CFLAGS and LDFLAGS

Status in “binutils” package in Ubuntu:
  Confirmed
Status in “gcc-4.6” package in Ubuntu:
  Confirmed
Status in “glib2.0” package in Ubuntu:
  Confirmed

Bug description:
  when using apt-get source libglib2.0-0, and adding -flto to the CFLAGS
  and LDFLAGS, the build fails with this:

  ./.libs/libglib-2.0.so: undefined reference to `__open_too_many_args'
  ./.libs/libglib-2.0.so: undefined reference to `__open_missing_mode'

  which are errors generated by FORTIFY_SOURCE. it's currently unknown
  if these are true positives from FORTIFY_SOURCE that are somehow
  missed without LTO, or are false positives due to codegen issues when
  enabling LTO.

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