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From: "davek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/46319] LTO plugin test failures with --with-build-config=bootstrap-lto --with-plugin-ld=ld
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46319

--- Comment #3 from Dave Korn <davek at gcc dot gnu.org> 2010-11-05 22:59:04 UTC ---
When I tried running these tests in a pre-existing build tree,
plugin_default_version_check failed because the datestamps don't match up:

(gdb) p gcc_version[0]
$5 = {basever = 0x1029fe8 "4.6.0", datestamp = 0x1029fee "20101103",
  devphase = 0x1029ff7 "experimental", revision = 0x1143f30 "",
  configuration_arguments = 0xd2d2c0 "/n/10/davek/gcc/gcc/configure
--prefix=/n/
10/davek/gcc --with-mpfr=/opt/cfarm/mpfr-2.4.1 --with-gmp=/opt/cfarm/gmp-4.2.4
-
-with-mpc=/opt/cfarm/mpc-0.8 --with-libelf=/n/10/davek/usr --enable-bootstrap
".
..}
(gdb) p plugin_version[0]
$6 = {basever = 0x7ffff7567d29 "4.6.0",
  datestamp = 0x7ffff7567d2f "20101105",
  devphase = 0x7ffff7567d38 "experimental", revision = 0x7ffff7567e28 "",
  configuration_arguments = 0x7ffff7566720 "/n/10/davek/gcc/gcc/configure
--pref
ix=/n/10/davek/gcc --with-mpfr=/opt/cfarm/mpfr-2.4.1
--with-gmp=/opt/cfarm/gmp-4
.2.4 --with-mpc=/opt/cfarm/mpc-0.8 --with-libelf=/n/10/davek/usr
--enable-bootst
rap "...}
(gdb)

This will happen if $objdir/gcc/plugin-version.h or $objdir/gcc/configargs.h
has been regenerated for any reason in between building the compiler and
running the test.  Can you tell if this may have happened in your case?