That patch was added to fix the following build failure:
FAILED: g++-4.8 -MMD -MF
obj/third_party/swiftshader/src/Common/swiftshader_common/CPUID.o.d
-DV8_DEPRECATION_WARNINGS -DUSE_UDEV -DUSE_AURA=1 -DUSE_PANGO=1 -DUSE_CAIRO=1
-DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DDISABLE_NACL
-DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL
-DCHROMIUM_BUILD -DENABLE_MEDIA_ROUTER=1 -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D__STDC_CONSTANT_MACROS
-D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -DCOMPONENT_BUILD -DNDEBUG
-DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DLOG_TAG=\"swiftshader_common\"
-I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector
-Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__=
-funwind-tables -fPIC -pipe -m32 -msse2 -mfpmath=sse -mmmx -pthread -Wall
-Wno-unused-local-typedefs -Wno-maybe-uninitialized
-Wno-missing-field-initializers -Wno-unused-parameter -O2 -fno-ident
-fdata-sections -ffunction-sections -fomit-frame-pointer -g1
-fvisibility=hidden -msse2 -fvisibility-inlines-hidden -std=gnu++11
-Wno-narrowing -fno-rtti -fno-exceptions -c
../../third_party/swiftshader/src/Common/CPUID.cpp -o
obj/third_party/swiftshader/src/Common/swiftshader_common/CPUID.o
../../third_party/swiftshader/src/Common/CPUID.cpp: In static member function
‘static bool sw::CPUID::detectMMX()’:
../../third_party/swiftshader/src/Common/CPUID.cpp:170:123: error: inconsistent
operand constraints in an ‘asm’
__asm volatile("cpuid": "=a" (registers[0]), "=b" (registers[1]), "=c"
(registers[2]), "=d" (registers[3]): "a" (info));
^
(full build log at https://launchpadlibrarian.net/316816355
/buildlog_ubuntu-trusty-i386.chromium-
browser_59.0.3071.15-0ubuntu0.14.04.1173_BUILDING.txt.gz)
On trusty we might need to revert
https://chromium.googlesource.com/chromium/src/+/d85baf0b71c69bbd181aaefc8a803611e03c8eed.
Or pass enabled_swiftshader=false as a build flag.
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https://bugs.launchpad.net/bugs/1697496
Title:
chromium 59.0.3071.86 crashes at startup on x86
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