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

[Julian Taylor]

compiling with gcc 4.7 snapshot leads to this issue:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50490

** Bug watch added: GCC Bugzilla #50490
   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50490

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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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