Internal compiler error when compile chromium on ARM

[Jammy Zhou]

Platform: Genisi Effika SmartBook (imx51)
OS: Ubuntu 10.10
Toolchain: both 4.4 and 4.5

- get the chromium browser code follow the instructions in http://dev.chromium.org/developers/how-tos/get-the-code
- export GYP_DEFINES="release_optimize=1 build_ffmpegsudo=0 werror= target_arch=arm disable_nacl=1 linux_use_tcmalloc=0 armv7=1 arm_neon=1 arm_thumb=1"
- in chromium/src directory, run "./build/gyp_chromium -f make"
- make -r BUILDTYPE=Release chrome
- get error below:

v8/src/bignum.cc: In member function 'void v8::internal::Bignum::Square()':
v8/src/bignum.cc:343:6: internal compiler error: Segmentation fault
Please submit a full bug report
with preprocessed source if appropriate.
...

[Chung-Lin Tang (cltang)]

Jammy, the Chromium build is really large to download and reproduce :)
Can you try to go to the v8 build directory, and add '-save-temps' to the compiler options to produce a 'bignum.ii' file for us?
Thanks!

[Jammy Zhou (jammy-zhou)]

bignum.ii is attached for your reference. Thanks!

[Chung-Lin Tang (cltang)]

Can you also give the gcc command line that executed to compile v8/src/bignum.cc (with all the compile options used)?
Thanks

[Jammy Zhou (jammy-zhou)]

g++ '-DENABLE_LOGGING_AND_PROFILING' '-DENABLE_DEBUGGER_SUPPORT' '-DENABLE_VMSTATE_TRACKING' '-DNO_TCMALLOC' '-DNO_HEAPCHECKER' '-DDISABLE_NACL' '-DV8_TARGET_ARCH_ARM' '-DCHROMIUM_BUILD' '-DENABLE_REMOTING=1' '-DENABLE_GPU=1' '-DNDEBUG' '-DNVALGRIND' '-DDYNAMIC_ANNOTATIONS_ENABLED=0' -Iv8/src -Iv8/src/arm -pthread -fno-exceptions -Wno-unused-parameter -Wno-missing-field-initializers -D_FILE_OFFSET_BITS=64 -fvisibility=hidden -pipe -fPIC -fno-strict-aliasing -mthumb -Wa,-mimplicit-it=thumb -march=armv7-a -mtune=cortex-a8 -mfloat-abi=softfp -mfpu=neon -O1 -fno-ident -fdata-sections -ffunction-sections -fomit-frame-pointer -O3 -fno-rtti -fno-threadsafe-statics -fvisibility-inlines-hidden -save-temps -Wno-abi -MMD -MF out/Release/.deps/out/Release/obj.target/v8_base/v8/src/bignum.o.d.raw -c -o out/Release/obj.target/v8_base/v8/src/bignum.o v8/src/bignum.cc

[Jammy Zhou (jammy-zhou)]

If we comment out "bigits_[i] = static_cast<Chunk>(accumulator) & kBigitMask;" at line #401 of attached bignum.cc, this problem disappeared.

[Chung-Lin Tang (cltang)]

I can't reproduce this yet. Jammy, exactly what compiler are you using? A Linaro release?
Thanks

[Jammy Zhou (jammy-zhou)]

I am currently using (Ubuntu/Linaro 4.5.1-7ubuntu2) 4.5.1 shipped with Maverick. It seems that (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5 doesn't have this problem.

[Chung-Lin Tang (cltang)]

This seems to be a vectorizor issue, triggerable by -O1 -mfpu=neon -ftree-vectorize, segfault in tree-vect-stmts.c:supportable_widening_operation().

[Alexander Sack (asac)]

shouldnt this be filed against gcc-linaro? (rather than binutils?)

[Chung-Lin Tang (cltang)]

Yes, this is a GCC problem.
Though take note this occurs on the Maverick GCC 4.5 package; Linaro 4.5 does not have this problem.

[Loïc Minier (lool)]

Is this an issue with gcc-4.5 4.5.2-1ubuntu2 from Ubuntu natty (development series)?

[Michael Hope (michaelh1)]

(For my reference)

Confirmed under Maverick using the minimal command line:
 g++-4.5 -mfpu=neon -O3 -c bignum.ii

on g++-4.5 4.5.1-7ubuntu2

Does not occur in gcc-linaro-4.5-2010.12-0.

Does not occur under Natty with g++-4.5 4.5.1-10ubuntu3

Loic, where does 4.5.2-1ubuntu2 live?

[Loïc Minier (lool)]

4.5.2-1ubuntu2 is the current version in natty

   gcc-4.5 | 4.5.2-1ubuntu2 | natty | source, amd64, i386

[Matthias Klose (doko)]

unreproducible with gcc-4.5 in natty.
unreproducible with gcc-4.5 and gcc-4.6 in oneiric.