[Bug c++/44256] New: When using -flto and -fwhole-program the compiler/linker crash

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

I saw that with GCC4.5, my software-only 3D renderer got a sizeable speed boost
when using -flto (during compilation) and -flto -fwhole-program (during
linking). I saw this working, successfully, with GCC4.5.0.

I then tried the same thing with 4.5.1 - and got an internal compiler error.
The crash doesn't happen when compiling, it happens at the final - link -
stage,
so there's no preprocessed input to provide... I can only hope that you will be
able to reproduce it on your environment.

The output error message from the linking stage:

lto1: internal compiler error: in gimple_register_type, at gimple.c:3820
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /usr/local/bin/g++45 returned 1 exit status
collect2: lto-wrapper returned 1 exit status
*** Error code 1

The source code that triggers the bug is here:

   http://users.softlab.ntua.gr/~ttsiod/renderer-2.x.latest.tar.bz2

Just use a simple "./configure && make" - it should be enough to trigger the
error.

The GCC I used:

$ g++45 -v
Using built-in specs.
COLLECT_GCC=g++45
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc45/gcc/x86_64-portbld-freebsd8.0/4.5.1/lto-wrapper
Target: x86_64-portbld-freebsd8.0
Configured with: ./../gcc-4.5-20100520/configure --enable-lto=yes
--with-libelf=/usr/local --disable-nls --libdir=/usr/local/lib/gcc45
--libexecdir=/usr/local/libexec/gcc45 --program-suffix=45
--with-as=/usr/local/bin/as --with-gmp=/usr/local
--with-gxx-include-dir=/usr/local/lib/gcc45/include/c++/
--with-ld=/usr/local/bin/ld --with-libiconv-prefix=/usr/local
--with-system-zlib --disable-rpath --enable-libgcj --prefix=/usr/local
--mandir=/usr/local/man --infodir=/usr/local/info/gcc45
--build=x86_64-portbld-freebsd8.0
Thread model: posix
gcc version 4.5.1 20100520 (prerelease) (GCC)

My system:

$ uname -a
FreeBSD freebsd.gizi.gr 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:02:08
UTC 2009     root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

The compilation options generated by configure and used during compilation:

g++45 -DHAVE_CONFIG_H -I.  -I/usr/local/include/SDL -I/usr/local/include
-D_GNU_SOURCE=1 -D_REENTRANT -I./../lib3ds-1.3.0/ -fopenmp  -O3 -g -Wall
-Wextra -fomit-frame-pointer -ffast-math -funsafe-math-optimizations
-mtune=native -flto -msse -mrecip -mfpmath=sse -msse2 -mssse3 -DNDEBUG -MT
renderer-Base3d.o -MD -MP -MF .deps/renderer-Base3d.Tpo -c -o renderer-Base3d.o
`test -f 'Base3d.cc' || echo './'`Base3d.cc

Compilation doesn't trigger the error, linking does, and these are the linking
params:

g++45  -O3 -g -Wall -Wextra -fomit-frame-pointer -ffast-math
-funsafe-math-optimizations -mtune=native -flto -msse -mrecip -mfpmath=sse
-msse2 -mssse3 -DNDEBUG    -o renderer renderer-renderer.o renderer-Algebra.o
renderer-Camera.o  renderer-Keyboard.o renderer-Light.o  renderer-Object3D.o
renderer-Scene.o  renderer-Screen.o renderer-Base3d.o -fwhole-program
-L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -pthread  -fopenmp
../lib3ds-1.3.0/lib3ds/.libs/lib3ds.a -lstdc++

Anything else I might help with, don't hesitate to ask.


-- 
           Summary: When using -flto and -fwhole-program the compiler/linker
                    crash
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ttsiodras at gmail dot com
 GCC build triplet: x86_64-unknown-freebsd8.0
  GCC host triplet: x86_64-unknown-freebsd8.0
GCC target triplet: x86_64-unknown-freebsd8.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44256