FS#65 : chromium: failed to build on efikamx devices

Attached to Project: CRUX-ARM
Opened by Jose V Beneyto - 2013-11-19
Last edited by Victor Martinez - 2017-11-26

FS#65 - chromium: failed to build on efikamx devices

I only tried with optimized CFLAGS="-O2 -pipe -mfloat-abi=hard -march=armv7-a -mfpu=vfpv3-d16", maybe generic flags could work but anyway we should fix that.

When developing the first overlay port for chromium I found a similar problem with neon when compiling webrtc/common_audio component and I created a patch[1]. This was the error log[2].

Now the problem sounds similar as reported here[3]. This is the current error log[4]. So we can try to create a patch for it.

[1] - https://crux-arm.nu/gitweb?p=ports/opt-arm.git;a=blob_plain;f=chromium/webrtc-arm_neon.patch;hb=0826c9bd07b8f0665e3788fc1671911dd5522554

[2] - error log for webrtc/common_audio:

cc '-DANGLE_DX11' '-DWEBRTC_SVNREVISION="Unavailable(issue687)"' '-D_FILE_OFFSET_BITS=64' '-DDISABLE_NACL' '-DCHROMIUM_BUILD' '-DUSE_DEFAULT_RENDER_THEME=1' '-DUSE_LIBJPEG_TURBO=1' '-DUSE_NSS=1' '-DUSE_X11=1' '-DENABLE_ONE_CLICK_SIGNIN' '-DGTK_DISABLE_SINGLE_INCLUDES=1' '-DENABLE_REMOTING=1' '-DENABLE_WEBRTC=1' '-DUSE_PROPRIETARY_CODECS' '-DENABLE_PEPPER_CDMS' '-DENABLE_CONFIGURATION_POLICY' '-DENABLE_INPUT_SPEECH' '-DENABLE_NOTIFICATIONS' '-DENABLE_GPU=1' '-DENABLE_EGLIMAGE=1' '-DENABLE_TASK_MANAGER=1' '-DENABLE_EXTENSIONS=1' '-DENABLE_PLUGIN_INSTALLATION=1' '-DENABLE_PLUGINS=1' '-DENABLE_SESSION_SERVICE=1' '-DENABLE_THEMES=1' '-DENABLE_BACKGROUND=1' '-DENABLE_AUTOMATION=1' '-DENABLE_GOOGLE_NOW=1' '-DENABLE_FULL_PRINTING=1' '-DENABLE_PRINTING=1' '-DENABLE_SPELLCHECK=1' '-DENABLE_CAPTIVE_PORTAL_DETECTION=1' '-DENABLE_MANAGED_USERS=1' '-DENABLE_MDNS=1' '-DWEBRTC_CHROMIUM_BUILD' '-DWEBRTC_ARCH_ARM' '-DWEBRTC_ARCH_ARM_V7' '-DWEBRTC_DETECT_ARM_NEON' '-DWEBRTC_LINUX' '-D__STDC_CONSTANT_MACROS' '-D__STDC_FORMAT_MACROS' '-DNDEBUG' '-DNVALGRIND' '-DDYNAMIC_ANNOTATIONS_ENABLED=0' '-D_FORTIFY_SOURCE=2' -Ithird_party/webrtc -Ithird_party -I.  -fstack-protector --param=ssp-buffer-size=4 -pthread -fno-exceptions -fno-strict-aliasing -Wall -Wno-unused-parameter -Wno-missing-field-initializers -fvisibility=hidden -pipe -fPIC -mfpu=neon -flax-vector-conversions -march=armv7-a -mtune=cortex-a8 -mfloat-abi=hard -mthumb -O2 -fno-ident -fdata-sections -ffunction-sections -O2 -pipe -mfloat-abi=hard -march=armv7-a -I/usr/include/nspr  -MMD -MF out/Release/.deps/out/Release/obj.target/common_audio_neon/third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.o.d.raw -O2 -pipe -mfloat-abi=hard -march=armv7-a -mfpu=vfpv3-d16 -I/usr/include/nspr  -c -o out/Release/obj.target/common_audio_neon/third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.o third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S

third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S: Assembler messages:
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:51: Error: selected FPU does not support instruction – `vmov.i32 q9,#0'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:52: Error: selected FPU does not support instruction – `vmov.i32 q14,#0'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:62: Error: selected processor does not support ARM mode `vmull.s16 q12,d20,d22'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:63: Error: selected processor does not support ARM mode `vmull.s16 q13,d21,d23'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:64: Error: selected processor does not support ARM mode `vpadal.s32 q9,q12'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:65: Error: selected processor does not support ARM mode `vpadal.s32 q14,q13'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:84: Error: selected FPU does not support instruction – `vadd.i64 d18,d19'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:85: Error: selected FPU does not support instruction – `vadd.i64 d28,d29'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:86: Error: selected FPU does not support instruction – `vadd.i64 d18,d28'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:89: Error: selected FPU does not support instruction – `vadd.i64 d17,d18'
third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.S:90: Error: selected processor does not support ARM mode `vshl.s64 d17,d16'
make: * [out/Release/obj.target/common_audio_neon/third_party/webrtc/common_audio/signal_processing/cross_correlation_neon.o] Error 1
make: * Waiting for unfinished jobs....
In file included from third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:16:0:
/usr/lib/gcc/arm-unknown-linux-gnueabihf/4.7.3/include/arm_neon.h:32:2: error: #error You must enable NEON instructions (e.g. -mfloat-abi=softfp -mfpu=neon) to use arm_neon.h
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc: In static member function 'static float webrtc::SincResampler::Convolve_NEON(const float*, const float*, const float*, double)':
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:23:3: error: 'float32x4_t' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:23:15: error: expected ';' before 'm_input'
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:24:15: error: expected ';' before 'm_sums1'
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:25:15: error: expected ';' before 'm_sums2'
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:29:5: error: 'm_input' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:29:34: error: 'vld1q_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:31:5: error: 'm_sums1' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:31:56: error: 'vmlaq_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:33:5: error: 'm_sums2' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:38:3: error: 'm_sums1' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:39:71: error: 'vmovq_n_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:39:72: error: 'vmulq_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:40:7: error: 'm_sums2' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:40:56: error: 'vmlaq_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:43:3: error: 'float32x2_t' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:43:15: error: expected ';' before 'm_half'
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:44:34: error: 'm_half' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:44:48: error: 'vpadd_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:44:52: error: 'vget_lane_f32' was not declared in this scope
third_party/webrtc/common_audio/resampler/sinc_resampler_neon.cc:45:1: warning: control reaches end of non-void function [-Wreturn-type]
make: *** [out/Release/obj.target/common_audio_neon/third_party/webrtc/common_audio/resampler/sinc_resampler_neon.o] Error 1

[3] - https://code.google.com/p/chromium/issues/detail?id=154107

[4] - error log for webrtc/commom_audio:

g++ '-DANGLE_DX11' '-D_FILE_OFFSET_BITS=64' '-DDISABLE_NACL' '-DCHROMIUM_BUILD' '-DUSE_DEFAULT_RENDER_THEME=1' '-DUSE_LIBJPEG_TURBO=1' '-DUSE_NSS=1' '-DUSE_X11=1' '-DENABLE_ONE_CLICK_SIGNIN' '-DGTK_DISABLE_SINGLE_INCLUDES=1' '-DENABLE_REMOTING=1' '-DENABLE_WEBRTC=1' '-DUSE_PROPRIETARY_CODECS' '-DENABLE_PEPPER_CDMS' '-DENABLE_CONFIGURATION_POLICY' '-DENABLE_INPUT_SPEECH' '-DENABLE_NOTIFICATIONS' '-DENABLE_GPU=1' '-DENABLE_EGLIMAGE=1' '-DENABLE_TASK_MANAGER=1' '-DENABLE_EXTENSIONS=1' '-DENABLE_PLUGIN_INSTALLATION=1' '-DENABLE_PLUGINS=1' '-DENABLE_SESSION_SERVICE=1' '-DENABLE_THEMES=1' '-DENABLE_BACKGROUND=1' '-DENABLE_AUTOMATION=1' '-DENABLE_GOOGLE_NOW=1' '-DENABLE_FULL_PRINTING=1' '-DENABLE_PRINTING=1' '-DENABLE_SPELLCHECK=1' '-DENABLE_CAPTIVE_PORTAL_DETECTION=1' '-DENABLE_MANAGED_USERS=1' '-DENABLE_MDNS=1' '-DGOOGLE_PROTOBUF_NO_RTTI' '-DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER' '-DNDEBUG' '-DNVALGRIND' '-DDYNAMIC_ANNOTATIONS_ENABLED=0' -Ithird_party/protobuf -Ithird_party/protobuf/src  -fstack-protector --param=ssp-buffer-size=4 -pthread -fno-exceptions -fno-strict-aliasing -Wno-unused-parameter -Wno-mis...skipping...

aecm_core.c:(.text.WebRtcAecm_InitCore+0x212): undefined reference to `WebRtc_GetCPUFeaturesARM'
aecm_core.c:(.text.WebRtcAecm_InitCore+0x278): undefined reference to `WebRtcAecm_StoreAdaptiveChannelNeon'
aecm_core.c:(.text.WebRtcAecm_InitCore+0x27c): undefined reference to `WebRtcAecm_ResetAdaptiveChannelNeon'
aecm_core.c:(.text.WebRtcAecm_InitCore+0x280): undefined reference to `WebRtcAecm_CalcLinearEnergiesNeon'
out/Release/obj.target/third_party/webrtc/modules/../../../audio_processing/third_party/webrtc/modules/audio_processing/aecm/aecm_core.o: In function `WebRtcAec
m_ProcessBlock':
aecm_core.c:(.text.WebRtcAecm_ProcessBlock+0x990): undefined reference to `WebRtcAecm_kSqrtHanning'
out/Release/obj.target/third_party/webrtc/common_audio/../../../common_audio/third_party/webrtc/common_audio/resampler/sinc_resampler.o: In function `webrtc::Si
ncResampler::InitializeCPUSpecificFeatures()':
sinc_resampler.cc:(.text._ZN6webrtc13SincResampler29InitializeCPUSpecificFeaturesEv+0x4): undefined reference to `WebRtc_GetCPUFeaturesARM'
sinc_resampler.cc:(.text._ZN6webrtc13SincResampler29InitializeCPUSpecificFeaturesEv+0x34): undefined reference to `webrtc::SincResampler::Convolve_NEON(float const*, float const*, float const*, double)'
out/Release/obj.target/third_party/webrtc/common_audio/../../../common_audio/third_party/webrtc/common_audio/signal_processing/spl_init.o: In function `InitFunctionPointers':
spl_init.c:(.text.InitFunctionPointers+0x2): undefined reference to `WebRtc_GetCPUFeaturesARM'
spl_init.c:(.text.InitFunctionPointers+0x18c): undefined reference to `WebRtcSpl_MaxAbsValueW16Neon'
spl_init.c:(.text.InitFunctionPointers+0x194): undefined reference to `WebRtcSpl_MaxAbsValueW32Neon'
spl_init.c:(.text.InitFunctionPointers+0x19c): undefined reference to `WebRtcSpl_MaxValueW16Neon'
spl_init.c:(.text.InitFunctionPointers+0x1a4): undefined reference to `WebRtcSpl_MaxValueW32Neon'
spl_init.c:(.text.InitFunctionPointers+0x1ac): undefined reference to `WebRtcSpl_MinValueW16Neon'
spl_init.c:(.text.InitFunctionPointers+0x1b4): undefined reference to `WebRtcSpl_MinValueW32Neon'
spl_init.c:(.text.InitFunctionPointers+0x1bc): undefined reference to `WebRtcSpl_CrossCorrelationNeon'
spl_init.c:(.text.InitFunctionPointers+0x1c4): undefined reference to `WebRtcSpl_DownsampleFastNeon'
spl_init.c:(.text.InitFunctionPointers+0x1cc): undefined reference to `WebRtcSpl_ScaleAndAddVectorsWithRoundNeon'
out/Release/obj.target/third_party/webrtc/modules/../../../iSACFix/third_party/webrtc/modules/audio_coding/codecs/isac/fix/source/isacfix.o: In function `WebRtcIsacfix_EncoderInit':
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x110): undefined reference to `WebRtc_GetCPUFeaturesARM'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1c8): undefined reference to `WebRtcIsacfix_AutocorrNeon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1cc): undefined reference to `WebRtcIsacfix_FilterMaLoopNeon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1d0): undefined reference to `WebRtcIsacfix_Spec2TimeNeon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1d4): undefined reference to `WebRtcIsacfix_Time2SpecNeon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1d8): undefined reference to `WebRtcIsacfix_CalculateResidualEnergyNeon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1dc): undefined reference to `WebRtcIsacfix_AllpassFilter2FixDec16Neon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1e0): undefined reference to `WebRtcIsacfix_MatrixProduct1Neon'
isacfix.c:(.text.WebRtcIsacfix_EncoderInit+0x1e4): undefined reference to `WebRtcIsacfix_MatrixProduct2Neon'
out/Release/obj.target/third_party/webrtc/modules/../../../iSACFix/third_party/webrtc/modules/audio_coding/codecs/isac/fix/source/transform.o: In function `WebRtcIsacfix_Time2SpecC':
transform.c:(.text.WebRtcIsacfix_Time2SpecC+0x320): undefined reference to `WebRtcIsacfix_kCosTab1'
transform.c:(.text.WebRtcIsacfix_Time2SpecC+0x324): undefined reference to `WebRtcIsac

Closed by Victor Martinez
Sunday, 26 November 2017, 11:28 GMT
Reason for closing: Won't implement

Jose V Beneyto commented on Tuesday, 19 November 2013, 17:30 GMT

We can also try the last development version for chromium instead of the stable one. This version should have merged last webrtc code where should be fixed.

Jose V Beneyto commented on Wednesday, 27 November 2013, 12:01 GMT

I'll try to improve the Pkgfile to parse environment CFLAGS and assign those values to available gypi variables.
For now we can play with -Darm_arch, -Darm_tune, -Darm_fpu, ... directly in the Pkgfile, then if the build works we can start to improve the Pkgfile as I said.

This is the section from build/common.gypi:

    # Set default compiler flags depending on ARM version.
    ['arm_version==5 and android_webview_build==0', {
      # Flags suitable for Android emulator
      'arm_arch%': 'armv5te',
      'arm_tune%': 'xscale',
      'arm_fpu%': '',
      'arm_float_abi%': 'soft',
      'arm_thumb%': 0,
    }],
    ['arm_version==6 and android_webview_build==0', {
      'arm_arch%': 'armv6',
      'arm_tune%': '',
      'arm_fpu%': '',
      'arm_float_abi%': 'soft',
      'arm_thumb%': 0,
    }],
    ['arm_version==7 and android_webview_build==0', {
      'arm_arch%': 'armv7-a',
      'arm_tune%': 'cortex-a8',
      'conditions': [
        ['arm_neon==1', {
          'arm_fpu%': 'neon',
        }, {
          'arm_fpu%': 'vfpv3-d16',
        }],
      ],
      'arm_float_abi%': 'softfp',
      'arm_thumb%': 1,
    }],

This comment is also valid for ticket ~~FS#66~~ , so I'll marked as related to this task.

Jose V Beneyto commented on Saturday, 30 November 2013, 12:06 GMT

ARM flags should be detected by chromium, but the fact is that I have tried to don't use the sysroot value because we are not crosscompiling which is the default way for chromium

https://chromium.googlesource.com/native_client/pnacl-clang/+/upstream/master/test/Driver/arm-mfpu.c

From the link above:

RUN: %clang -target arm-linux-eabi %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-DEFAULT %s
CHECK-DEFAULT-NOT: "-target-feature" "+vfp2"
CHECK-DEFAULT-NOT: "-target-feature" "+vfp3"
CHECK-DEFAULT-NOT: "-target-feature" "+d16"
CHECK-DEFAULT-NOT: "-target-feature" "+neon"

* By default they use all the target features, then if tests failed for a expecific fpu they assign the right flags.
symbol + for features they keep in flags
symbol - for features dropped from flags

The most importants for us are that:

RUN: %clang -target arm-linux-eabi -mfpu=vfp3-d16 %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-VFP3-D16 %s
RUN: %clang -target arm-linux-eabi -mfpu=vfpv3-d16 %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-VFP3-D16 %s
CHECK-VFP3-D16: "-target-feature" "+vfp3"
CHECK-VFP3-D16: "-target-feature" "+d16"
CHECK-VFP3-D16: "-target-feature" "-neon" * if fpu=vfp3-d16 worked then neon is dissabled RUN: %clang -target arm-linux-eabi -mfpu=vfp3 %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-VFP3 %s
RUN: %clang -target arm-linux-eabi -mfpu=vfpv3 %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-VFP3 %s
CHECK-VFP3: "-target-feature" "+vfp3"
CHECK-VFP3: "-target-feature" "-neon" * if fpu=vfpv3 worked then neon is dissabled RUN: %clang -target arm-linux-eabi -mfpu=neon %s -### -o %t.o 2>&1 \
RUN: | FileCheck –check-prefix=CHECK-NEON %s
CHECK-NEON: "-target-feature" "+neon"

* if fpu=neon worked then neon is enabled

ATM we are using these flags from pkgmk.conf:
CFLAGS="-O2 -pipe -mfloat-abi=hard -march=armv7-a -mfpu=vfpv3-d16"

And on the other side for the efikamx we have:
$ grep Features /proc/cpuinfo
Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3

I tried some text to verify these cpu features:

$ cat > conftest.c « EOF int main(void) { return 0; }
EOF

$ gcc -o conftest conftest.c -Wall -mfpu=vfpv3
$ ./conftest
$ echo $?
0
$ readelf -A conftest | grep -v Tag_ABI
Attribute Section: aeabi
File Attributes

Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-2
Tag_FP_arch: VFPv3
Tag_CPU_unaligned_access: v6

$ gcc -o conftest conftest.c -Wall -mfpu=vfpv3-d16
$ ./conftest
$ echo $?
0
$ readelf -A conftest | grep -v Tag_ABI
Attribute Section: aeabi
File Attributes

Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-2
Tag_FP_arch: VFPv3-D16
Tag_CPU_unaligned_access: v6

$ gcc -o conftest conftest.c -Wall -mfpu=neon
$ ./conftest
$ echo $?
0
$ readelf -A conftest | grep -v Tag_ABI
Attribute Section: aeabi
File Attributes

Tag_CPU_name: "7-A"
Tag_CPU_arch: v7
Tag_CPU_arch_profile: Application
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-2
Tag_FP_arch: VFPv3
Tag_Advanced_SIMD_arch: NEONv1
Tag_CPU_unaligned_access: v6

I'm wondering if -mfpu=vfpv3-d16 for our flags could be invalid, so in our /proc/cpuinfo is listed as vfpv3 only.
Maybe I'm wrong but IMHO we should use -mfpu=vfpv3 from our CFLAGS or try to use -mfpu=neon which also should be right.
Please if you have more info about the -d16 feature let me know ;D

When building the first times for chromium port on efikamx I remember that it failed with fpu sometimes and manually worked if I use -fpu=neon, so I'll try to build chromium with these gyp defines:

Darmv7=1 \
Darm_thumb=1 \
Darm_neon=1 \
Darm_fpu=neon \
Darm_tune= \
Dv8_target_arch=arm \
Dv8_use_arm_eabi_hardfloat=1 \

I hope this works :D

Jose V Beneyto commented on Saturday, 30 November 2013, 12:19 GMT

Currently, only the following flags are defined, for the ARM CPU Family:

 ANDROID_CPU_ARM_FEATURE_ARMv7
    Indicates that the device's CPU supports the ARMv7-A instruction
    set as supported by the "armeabi-v7a" abi (see CPU-ARCH-ABIS.html).
    This corresponds to Thumb-2 and VFPv3-D16 instructions.

 ANDROID_CPU_ARM_FEATURE_VFPv3
    Indicates that the device's CPU supports the VFPv3 hardware FPU
    instruction set extension. Due to the definition of 'armeabi-v7a',
    this will always be the case if ANDROID_CPU_ARM_FEATURE_ARMv7 is
    returned.

    Note that this corresponds to the minimum profile VFPv3-D16 that
    _only_ provides 16 hardware FP registers.

 ANDROID_CPU_ARM_FEATURE_NEON
    Indicates that the device's CPU supports the ARM Advanced SIMD
    (a.k.a. NEON) vector instruction set extension. Note that ARM
    mandates that such CPUs also implement VFPv3-D32, which provides
    32 hardware FP registers (shared with the NEON unit).

from: http://docs.huihoo.com/android/ndk/r5/CPU-FEATURES.html

CRUX-ARM : Home

FS#65 - chromium: failed to build on efikamx devices

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	~~FS#66 - chromium: failed to build on raspberrypi devices~~