Bug 901750

Created attachment 682821 [details]
Preprocessed source dumped by gcc upon internal error

Description of problem:

Build with gcc for EL5 x86_64 architecture aborts on "internal compiler error: in extract_insn, at recog.c:2084" upon compilation of djb's NaCl library. Build for i386 seems unaffected.

This happens both when building via mock for "epel-5-x86_64" on F17 and also directly on EL5. Both times tried on x86_64 system.

Preprocessed source file attached. Using hand-compiled vanilla gcc-4.4.6 on the same system does not exhibit this issue.


Version-Release number of selected component (if applicable):

gcc.x86_64 4.1.2-52.el5


How reproducible:

Always. 
On FC17 via mock with epel-5-x86_64 config and also directly on EL5.


Steps to Reproduce:

1. Download attached preprocessed file EL5-gcc-4.1.2-internal-compiler-error-preprocessed.c and the compiler invocation in run_compile.sh
2. Run ./run_compile.sh on EL5 x86_64

Actual results:

Compiler fails with internal error, producing this message after running the run_compile script:

{{{
Machine is x86_64 architecture, gcc version is:
gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-52)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

===============
+ /usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I. -I./src/ext -Isrc/ext -I./src/common -Isrc/common -I./src/or -Isrc/or '-DSHARE_DATADIR="/usr/local/share"' '-DLOCALSTATEDIR="/usr/local/var"' '-DBINDIR="/usr/local/bin"' -I./src/common -g -O2 -D_FORTIFY_SOURCE=2 -fstack-protector-all -Wstack-protector -fwrapv --param ssp-buffer-size=1 -fPIE -Wall -fno-strict-aliasing -MT zzz.o -MD -MP -c -o zzz.o EL5-gcc-4.1.2-internal-compiler-error-preprocessed.c
src/ext/curve25519_donna/curve25519-donna-c64.c: In function ‘curve25519_donna’:
src/ext/curve25519_donna/curve25519-donna-c64.c:449: error: unrecognizable insn:
(insn 10003 10002 10004 20 src/ext/curve25519_donna/curve25519-donna-c64.c:259 (parallel [
            (set (reg:CC 17 flags)
                (unspec:CC [
                        (reg:DI 2 cx [orig:375 t$0.894 ] [375])
                        (const_int 2251799813685229 [0x7ffffffffffed])
                    ] 24))
            (set (reg:DI 2 cx [orig:375 t$0.894 ] [375])
                (plus:DI (reg:DI 2 cx [orig:375 t$0.894 ] [375])
                    (const_int 2251799813685229 [0x7ffffffffffed])))
        ]) -1 (nil)
    (nil))
src/ext/curve25519_donna/curve25519-donna-c64.c:449: internal compiler error: in extract_insn, at recog.c:2084
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccdOxozN.out file, please attach this to your bugreport.
+ echo Exit code: 1
Exit code: 1
}}}


Expected results:

Compile results in a working ELF object file.

Additional info:

Complete src.rpm can be obtained here, if needed: https://people.torproject.org/~hiviah/tor-0.2.4.9.alpha-tor.1.rh5_8.src.rpm

Building with `mock --rebuild -r epel-5-x86_64 tor-0.2.4.9.alpha-tor.1.rh5_8.src.rpm` triggers the same bug, as does `./configure --disable-asciidoc && make` on EL5 x86_64 when run on the tar.gz source of unpacked .tar.gz from inside the SRPM (disabling docs generation is just for making it a bit faster).

This bug seems very similar, but I'm not sure whether it's identical: https://bugzilla.redhat.com/show_bug.cgi?id=730382

Related error in Tor tracker - https://trac.torproject.org/projects/tor/ticket/7975