[Bug lto/64043] [5 Regression] ICE (segfault) with LTO: in tree_check/tree.h:2758 get_binfo_at_offset/tree.c:11914

["schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64043

--- Comment #11 from Andreas Schwab <schwab@linux-m68k.org> ---
This breaks ada:

$ gcc/gnatmake --GCC=gcc/xgcc --GNATBIND=gcc/gnatbind --GNATLINK=gcc/gnatlink
-cargs -Bgcc/ -largs '--GCC=gcc/xgcc -Bgcc'  -margs
--RTS=ia64-suse-linux/./libada -f ../gcc/testsuite/gnat.dg/lto8.adb -gnatws
-flto -lm -o ./lto8.exe
gcc/xgcc -c -I../gcc/testsuite/gnat.dg/ -Bgcc/ --RTS=ia64-suse-linux/./libada
-gnatws -flto -lm -I- ../gcc/testsuite/gnat.dg/lto8.adb
gcc/xgcc -c -I../gcc/testsuite/gnat.dg/ -Bgcc/ --RTS=ia64-suse-linux/./libada
-gnatws -flto -lm -I- ../gcc/testsuite/gnat.dg/lto8_pkg.adb
gcc/gnatbind --RTS=ia64-suse-linux/./libada -x lto8.ali
gcc/gnatlink lto8.ali --GCC=gcc/xgcc -Bgcc -flto -o ./lto8.exe
../gcc/testsuite/gnat.dg/lto8_pkg.ads: In function ‘lto8_pkg___elabs’:
../gcc/testsuite/gnat.dg/lto8_pkg.ads:4:1: internal compiler error: in
expand_gimple_stmt_1, at cfgexpand.c:3420
 package Lto8_Pkg is
 ^
0x400000000026d36f expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3420
0x400000000026e52f expand_gimple_stmt
        ../../gcc/cfgexpand.c:3447
0x400000000027014f expand_gimple_basic_block
        ../../gcc/cfgexpand.c:5280
0x400000000027453f execute
        ../../gcc/cfgexpand.c:5889
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/gcc/test/Build/gcc/xgcc returned 1 exit
status
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From: "belagod at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/64328] New: addr_equal-1.c fails execution.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd328

            Bug ID: 64328
           Summary: addr_equal-1.c fails execution.
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: belagod at gcc dot gnu.org

FAIL: gcc.dg/addr_equal-1.c execution test

$ aarch64-none-elf-gcc
/work/dev/arm/src/gcc/gcc/testsuite/gcc.dg/addr_equal-1.c -O2 -lm -mcmodel=tiny
-fPIC -o foo.exe

fails on AArch64. This test was introduced by this patch:

https://gcc.gnu.org/ml/gcc-patches/2014-12/msg00613.html

The specific test that's failing is

  if (!__builtin_constant_p (&def_var0 == &def_var1))
    abort();

where def_var0 and def_var1 are globals declared in the same translation unit.
When compiled with fPIC, how much can we know about their addresses at
compile-time for the above test to pass? Is this test valid?