Bug 246129 – Failure to build webkit2gtk 2.38.0 on armv7l

• Component: WebCore Misc.
• Status: RESOLVED CONFIGURATION CHANGED

Created attachment 462827 [details]
armv7l 2.38.0 build log

I'm building webkit2gtk 2.38.0 in the ChromeOS/Chromebrew linux environment. I'm having build success on x86_64 but not on armv7l.

I was told the patch at https://github.com/Igalia/meta-webkit/raw/main/recipes-browser/wpewebkit/wpewebkit/0001-FELightningNEON.cpp-fails-to-build-NEON-fast-path-se.patch was key to getting this built, but that isn't helping either. 

Any ideas on what to try next?

(I can provide a docker setup of our build environment if that would help.)

The error:

[2923/5622] Building CXX object Source/WebCore/CMakeFiles/WebCore.dir/__/__/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp.o
FAILED: Source/WebCore/CMakeFiles/WebCore.dir/__/__/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp.o 

In file included from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/builddir4/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp:3:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FEBlendNeonApplier.cpp: In member function ‘virtual bool WebCore::FEBlendNeonApplier::apply(const WebCore::Filter&, const WebCore::FilterImageVector&, WebCore::FilterImage&) const’:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FEBlendNeonApplier.cpp:200:18: warning: cast from ‘uint8_t*’ {aka ‘unsigned char*’} to ‘uint32_t*’ {aka ‘unsigned int*’} increases required alignment of target type [-Wcast-align]
  200 |     sourceA[0] = reinterpret_cast<uint32_t*>(sourcePixelArrayA->bytes())[0];
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FEBlendNeonApplier.cpp:201:25: warning: cast from ‘uint8_t*’ {aka ‘unsigned char*’} to ‘uint32_t*’ {aka ‘unsigned int*’} increases required alignment of target type [-Wcast-align]
  201 |     sourceBAndDest[0] = reinterpret_cast<uint32_t*>(sourcePixelArrayB->bytes())[0];
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FEBlendNeonApplier.cpp:203:5: warning: cast from ‘unsigned char*’ to ‘uint32_t*’ {aka ‘unsigned int*’} increases required alignment of target type [-Wcast-align]
  203 |     reinterpret_cast<uint32_t*>(destinationPixelArray)[0] = sourceBAndDest[0];
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:28,
                 from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/builddir4/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp:4:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h: In static member function ‘static void WebCore::FELightingSoftwareApplier::applyPlatformNeon(const LightingData&, const WebCore::LightSource::PaintingData&)’:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h:99:46: warning: attribute ignored [-Wattributes]
   99 |     WebCore::FELightingFloatArgumentsForNeon alignas(16) floatArguments;
      |                                              ^~~~~~~
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.h:99:46: note: an attribute that appertains to a type-specifier is ignored
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp: At global scope:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:38:8: error: standard attributes in middle of decl-specifiers
   38 | static alignas(16) short s_FELightingConstantsForNeon[] = {
      |        ^~~~~~~
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:38:8: note: standard attributes must precede the decl-specifiers to apply to the declaration, or follow them to apply to the type
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:38:8: warning: attribute ignored [-Wattributes]
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/cpu/arm/filters/FELightingNEON.cpp:38:8: note: an attribute that appertains to a type-specifier is ignored
In file included from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/builddir4/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp:7:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayListItemBuffer.cpp: In member function ‘void WebCore::DisplayList::ItemBuffer::append(const WebCore::DisplayList::DisplayListItem&)’:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayListItemBuffer.cpp:734:5: warning: cast from ‘uint8_t*’ {aka ‘unsigned char*’} to ‘uint64_t*’ {aka ‘long long unsigned int*’} increases required alignment of target type [-Wcast-align]
  734 |     reinterpret_cast<uint64_t*>(m_writableBuffer.data + m_writtenNumberOfBytes)[1] = dataLength;
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayList.h:29,
                 from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayList.cpp:27,
                 from /usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/builddir4/WebCore/DerivedSources/unified-sources/UnifiedSource-3c72abbe-37.cpp:5:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayListItemBuffer.h: In instantiation of ‘T& WebCore::DisplayList::ItemHandle::get() const [with T = WebCore::DisplayList::SetState]’:
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayList.cpp:88:55:   required from here
/usr/local/tmp/crew/webkit2gtk_4.20221004191608.dir/webkitgtk-2.38.0/Source/WebCore/platform/graphics/displaylists/DisplayListItemBuffer.h:79:17: warning: cast from ‘uint8_t*’ {aka ‘unsigned char*’} to ‘WebCore::DisplayList::SetState*’ increases required alignment of target type [-Wcast-align]
   79 |         return *reinterpret_cast<T*>(data + sizeof(uint64_t));
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Adrian Perez]

The NEON optimizations have been reworked a while back. The source
source files mentioned in the build error log no longer exist, so I
think we can close this.