[Bug lto/68799] lto ICE on powerpc64le-linux-gnu builing python 2.7.x

["wschmidt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68799

--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Hi Matthias,

Attempted to recreate with powerpc64le-linux-gnu running on POWER8 using latest
gcc-5-branch.  I get a different failure within lto1; output shown below.  This
indicates a problem streaming in a var_decl.  I expect there may be a problem
using objects from your GCC within mine -- perhaps slight differences in how
they're built?

In any case, can you provide materials and instructions for building from
source?  The initial problem is a segfault in code that I wrote a couple of
years back, so I'm the right person to look at it, provided I can reproduce it.

Thanks,
Bill


wschmidt@genoa:~/src/pr68799/tst$ $GCC_INSTALL/bin/gcc -pthread -Wl,-z,relro
-fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes
-D_FORTIFY_SOURCE=2 -fstack-protector-strong -Wformat -Werror=format-security
-fprofile-use -fprofile-correction -flto -fuse-linker-plugin -ffat-lto-objects
-Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions -o python python.o
-Wl,--whole-archive libpython2.7.a -Wl,--no-whole-archive -lpthread -ldl -lutil
-L/usr/lib -lz -lm 
posixmodule.o (symbol from plugin): warning: the use of `tmpnam_r' is
dangerous, better use `mkstemp'
posixmodule.o (symbol from plugin): warning: the use of `tempnam' is dangerous,
better use `mkstemp'
lto1: internal compiler error: Segmentation fault
0x105cd9b3 crash_signal
        /home/wschmidt/gcc/gcc-5_3-base/gcc/toplev.c:383
0x1048ba24 lto_file_decl_data_get_var_decl
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto-streamer.h:1222
0x1048ba24 lto_input_tree_ref(lto_input_block*, data_in*, function*, LTO_tags)
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto-streamer-in.c:400
0x1048bc63 lto_input_tree_1(lto_input_block*, data_in*, LTO_tags, unsigned int)
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto-streamer-in.c:1442
0x10165d93 lto_read_decls
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:1990
0x10167c53 lto_file_finalize
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:2249
0x10167c53 lto_create_files_from_ids
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:2259
0x10167c53 lto_file_read
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:2300
0x10167c53 read_cgraph_and_symbols
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:3005
0x10167c53 lto_main()
        /home/wschmidt/gcc/gcc-5_3-base/gcc/lto/lto.c:3475
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: /home/wschmidt/gcc/install/gcc-5_3-base/bin/gcc
returned 1 exit status
compilation terminated.
/usr/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status
wschmidt@genoa:~/src/pr68799/tst$