[Bug lto/69188] ICE when linking objects at different optimization levels with LTO and profile generation enabled. (Works with 4.9.3.)

["anthonyfk at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69188

--- Comment #26 from anthonyfk at gmail dot com ---
Thank you very much for the fix! I've tried the patch as applied to
gcc-6-branch with an otherwise fresh tarball of gcc 6.3.0. When compiling
lapack-3.6.1 I no longer get the original bug, but I do get:

lto1: internal compiler error: resolution sub id 0x7485cad21ad62861 not in
object file
0x54e61b lto_resolution_read
        /tmp/solido-build-20170120/gcc-6.3.0/gcc/lto/lto.c:1929
0x54e61b lto_file_read
        /tmp/solido-build-20170120/gcc-6.3.0/gcc/lto/lto.c:2092
0x54e61b read_cgraph_and_symbols
        /tmp/solido-build-20170120/gcc-6.3.0/gcc/lto/lto.c:2806
0xc9045a lto_main()
        /tmp/solido-build-20170120/gcc-6.3.0/gcc/lto/lto.c:3310
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: fatal error: /usr/local/solido/tools/20170120/bin/gfortran
returned 1 exit status
compilation terminated.
/usr/local/solido/tools/20170120/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:129: ../xeigtsts] Error 1

I tried searching the bug tracker to see if this was fixed already but didn't
have any luck. I'll try to put together a reduced test case in the next week,
but it's unfortunately a busy time of year for me so that may take longer. At
the very least, I can try with the latest tarball from the 6 branch easily.