I am trying to cross compile V8 for iOS (
https://chromium.googlesource.com/v8/v8.git/+/be47fd1c37ead74cf5c4479043426e0376d3ff29)
 
as described here: https://v8.dev/docs/cross-compile-ios

Using Mac OS 10.14.5 and XCode 10.2.1 I am getting the following error when 
building *embedded.S*:

[1321/1328] ASM obj/v8_snapshot/embedded.o
FAILED: obj/v8_snapshot/embedded.o 
../../third_party/llvm-build/Release+Asserts/bin/clang -MMD -MF obj/
v8_snapshot/embedded.o.d -DNO_TCMALLOC -DCHROMIUM_BUILD -DCR_XCODE_VERSION=
1021 -DCR_CLANG_REVISION=\"361212-67510fac-2\" -D__STDC_CONSTANT_MACROS 
-D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -DNDEBUG -DNVALGRIND 
-DDYNAMIC_ANNOTATIONS_ENABLED=0 -DNS_BLOCK_ASSERTIONS=1 
-DV8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=64 -DENABLE_MINOR_MC 
-DENABLE_HANDLE_ZAPPING -DV8_USE_SNAPSHOT -DV8_CONCURRENT_MARKING 
-DV8_EMBEDDED_BUILTINS -DV8_WIN64_UNWINDING_INFO -DV8_DEPRECATION_WARNINGS 
-DV8_IMMINENT_DEPRECATION_WARNINGS -DV8_TARGET_ARCH_X64 
-DDISABLE_UNTRUSTED_CODE_MITIGATIONS -DV8_DEPRECATION_WARNINGS 
-DV8_IMMINENT_DEPRECATION_WARNINGS -I../.. -Igen -I../.. -Igen 
-fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector 
-fcolor-diagnostics -fmerge-all-constants 
-fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm 
-Xclang -instcombine-lower-dbg-declare=0 -std=c11 -arch x86_64 -g2 
-isysroot 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.2.sdk
 
-stdlib=libc++ -mios-simulator-version-min=10 -c gen/embedded.S -o 
obj/v8_snapshot/embedded.o
gen/embedded.S:68:15: error: unexpected token in '.section' directive
.section .text
              ^
gen/embedded.S:379:1: error: unknown directive
.type Builtins_RecordWrite, @function
^
gen/embedded.S:431:1: error: unknown directive
.type Builtins_EphemeronKeyBarrier, @function
^
gen/embedded.S:448:1: error: unknown directive
.type Builtins_AdaptorWithBuiltinExitFrame, @function
^
gen/embedded.S:453:1: error: unknown directive
.type Builtins_ArgumentsAdaptorTrampoline, @function
^
gen/embedded.S:466:1: error: unknown directive
.type Builtins_CallFunction_ReceiverIsNullOrUndefined, @function
^
............ and hundreds of other similar errors ...........


This was working fine with this revision: 
https://chromium.googlesource.com/v8/v8.git/+/e0a109c05821fa36ec20e1f25895c23baa8d64c3

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