Failed to compile on macOS for iOS: 'pthread_jit_write_protect_np' is unavailable: not available on iOS

[chao...@gmail.com]

1.

*************************************************

gn args as following:

*************************************************

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

is_official_build = true

symbol_level = 0

target_cpu = "arm64"                  # "x64" for a simulator build.

target_os = "ios"

treat_warnings_as_errors = false

use_custom_libcxx = true             # Use Xcode's libcxx.

use_xcode_clang = false

v8_target_cpu = "arm64"

v8_enable_debugging_features = false

v8_enable_i18n_support = false        # Produces a smaller binary.

v8_enable_pointer_compression = false

v8_enable_v8_checks = false

v8_monolithic = true                  # Enable the v8_monolith target.

v8_use_external_startup_data = false  # The snaphot is included in the binary.

2.

*************************************************

error msg as following:

*************************************************

../../src/wasm/code-space-access.cc:40:3: error: 'pthread_jit_write_protect_np' is unavailable: not available on iOS

  pthread_jit_write_protect_np(0);

  ^

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/include/pthread.h:561:6: note: 'pthread_jit_write_protect_np' has been explicitly marked unavailable here

void pthread_jit_write_protect_np(int enabled);

     ^

../../src/wasm/code-space-access.cc:44:3: error: 'pthread_jit_write_protect_np' is unavailable: not available on iOS

  pthread_jit_write_protect_np(1);

[chao...@gmail.com]

Oh, I forgot to mention the version. I am trying to compile V8 v9.4.113.

[chao...@gmail.com]

It shows another error when I Use Xcode's libcxx and Use Xcode's clang...

1.

*************************************************

gn args as following:

*************************************************

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

is_official_build = true

symbol_level = 0

target_cpu = "arm64"                  # "x64" for a simulator build.

target_os = "ios"

treat_warnings_as_errors = false

use_custom_libcxx = false             # Use Xcode's libcxx.

use_xcode_clang = true

v8_target_cpu = "arm64"

v8_enable_debugging_features = false

v8_enable_i18n_support = false        # Produces a smaller binary.

v8_enable_pointer_compression = false

v8_enable_v8_checks = false

v8_monolithic = true                  # Enable the v8_monolith target.

v8_use_external_startup_data = false  # The snaphot is included in the binary.

2.

*************************************************

error msg as following:

*************************************************

../../include/cppgc/allocation.h:168:39: error: no member named 'forward' in namespace 'std'

    T* object = ::new (memory) T(std::forward<Args>(args)...);

                                 ~~~~~^

../../include/cppgc/allocation.h:168:47: error: 'Args' does not refer to a value

    T* object = ::new (memory) T(std::forward<Args>(args)...);

                                              ^

../../include/cppgc/allocation.h:164:25: note: declared here

  template <typename... Args>

On Thursday, August 5, 2021 at 11:10:14 PM UTC+8 chao...@gmail.com wrote:

[chao...@gmail.com]

My OS version is macOS Big Sur 11.5.

[Clemens Backes]

Thanks for letting us know, we indeed did not differentiate between MacOS and iOS. I just landed a fix for this: https://crrev.com/c/3077154

The error about std::forward should be fixable by adding an #include <utility> in include/cppgc/allocation.h. Can you try that?

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Clemens Backes

Software Engineer

clem...@google.com

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[chao...@gmail.com]

Thanks for your quick response!

Compiled successfully when I switched to tag 9.4.116 and added an #include <utility> in include/cppgc/allocation.h.

But it shows error during the link stage: 

              Undefined symbols for architecture arm64:

                 "v8::internal::trap_handler::RegisterDefaultTrapHandler()", referenced from:

                     v8::internal::trap_handler::EnableTrapHandler(bool) in libv8_monolith.a(handler-outside.o)

                 "v8::internal::trap_handler::TryHandleSignal(int, __siginfo*, void*)", referenced from:

                     v8::TryHandleWebAssemblyTrapPosix(int, __siginfo*, void*) in libv8_monolith.a(api.o)

                     v8::V8::TryHandleSignal(int, void*, void*) in libv8_monolith.a(api.o)

               ld: symbol(s) not found for architecture arm64

               clang: error: linker command failed with exit code 1 (use -v to see invocation)

[chao...@gmail.com]

*************************************************

gn args as following:

*************************************************

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

is_official_build = true

symbol_level = 1

target_cpu = "arm64"

target_os = "ios"

treat_warnings_as_errors = false

use_custom_libcxx = false             # Use Xcode's libcxx.

use_xcode_clang = true

v8_target_cpu = "arm64"

v8_enable_debugging_features = false

v8_enable_i18n_support = false        # Produces a smaller binary.

v8_enable_pointer_compression = false

v8_enable_v8_checks = false

v8_monolithic = true                  # Enable the v8_monolith target.

v8_use_external_startup_data = false  # The snaphot is included in the binary.

[chao...@gmail.com]

If I switch to tag 8.5.188, everything works fine.

[DEVANSH M KAUSHIK]

I am also facing the same issue. 
Details are :

v8: tag/8.5.188

macOS: Big Sur 11.3.1

the original error "../../include/cppgc/allocation.h:168:39: error: no member named 'forward' in namespace 'std'" is resolved by switching to this v8 version "tag/8.5.188" but I am still getting the following error in this version :

=============================================================

➜  v8 git:(heads/tags/8.5.188) ✗ ninja -C out/release-ios            

ninja: Entering directory `out/release-ios'

[0/1] Regenerating ninja files

[1/3397] CXX obj/cppgc_base/marking-worklists.o

FAILED: obj/cppgc_base/marking-worklists.o 

../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -MMD -MF obj/cppgc_base/marking-worklists.o.d -DCR_XCODE_VERSION=1251 -DCR_CLANG_REVISION=\"llvmorg-14-init-591-g7d9d926a-1\" -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_ATOMIC_OBJECT_FIELD_WRITES -DV8_ATOMIC_MARKING_STATE -DV8_ENABLE_LAZY_SOURCE_POSITIONS -DV8_SHARED_RO_HEAP -DV8_WIN64_UNWINDING_INFO -DV8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH -DV8_SNAPSHOT_COMPRESSION -DV8_ENABLE_WEBASSEMBLY -DV8_ALLOCATION_FOLDING -DV8_ALLOCATION_SITE_TRACKING -DV8_ADVANCED_BIGINT_ALGORITHMS -DV8_DEPRECATION_WARNINGS -DV8_IMMINENT_DEPRECATION_WARNINGS -DCPPGC_CAGED_HEAP -DV8_TARGET_ARCH_ARM64 -DV8_HAVE_TARGET_OS -DV8_TARGET_OS_IOS -DV8_RUNTIME_CALL_STATS -DDISABLE_UNTRUSTED_CODE_MITIGATIONS -I../.. -Igen -I../../include -Igen/include -fno-delete-null-pointer-checks -fno-ident -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -fcolor-diagnostics -fmerge-all-constants -target arm64-apple-ios10 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -ffile-compilation-dir=. -no-canonical-prefixes -Wall -Wextra -Wimplicit-fallthrough -Wunreachable-code -Wthread-safety -Wextra-semi -Wunguarded-availability -Wundeclared-selector -Wno-missing-field-initializers -Wno-unused-parameter -Wloop-analysis -Wno-unneeded-internal-declaration -fno-omit-frame-pointer -g2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -fembed-bitcode -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wmissing-field-initializers -Wunreachable-code -Wshorten-64-to-32 -O3 -fvisibility=default -Wexit-time-destructors -std=c++14 -fno-trigraphs -Wno-trigraphs -fno-exceptions -fno-rtti -c ../../src/heap/cppgc/marking-worklists.cc -o obj/cppgc_base/marking-worklists.o

clang++: error: unknown argument: '-ffile-compilation-dir=.'

[2/3397] CXX obj/cppgc_base/name-trait.o

FAILED: obj/cppgc_base/name-trait.o 

=============================================================

*************************************************

gn args as following:

*************************************************

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

target_cpu = "arm64"

target_os = "ios"

treat_warnings_as_errors = false

use_custom_libcxx = false             # Use Xcode's libcxx.

use_xcode_clang = true

v8_target_cpu = "arm64"

v8_enable_debugging_features = false

v8_enable_i18n_support = false        # Produces a smaller binary.

v8_enable_pointer_compression = false

v8_enable_v8_checks = false

v8_monolithic = true                  # Enable the v8_monolith target.

v8_use_external_startup_data = false  # The snaphot is included in the binary.

ios_enable_code_signing=false

================================================

[DEVANSH M KAUSHIK]

If I remove the following form gn args . 

==============

use_custom_libcxx = false             # Use Xcode's libcxx.

use_xcode_clang = true

==============

I am using following setup  

xcode : 12.5.1

v8: tag/8.5.188

macOS: Big Sur 11.3.1

the build starts but fails while linking d8 with the following error :

➜  v8 git:(heads/tags/8.5.188) ✗ ninja -C out/release-ios

ninja: Entering directory `out/release-ios'

[0/1] Regenerating ninja files

[3202/3507] LINK ./d8

FAILED: d8 

TOOL_VERSION=1628482238 ../../build/toolchain/apple/linker_driver.py -Wcrl,strippath,../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --deterministic ../../third_party/llvm-build/Release+Asserts/bin/clang++ -B ../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/  -Wl,-fatal_warnings -target arm64-apple-ios10 -nostdlib++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -Wl,-ObjC -Wl,-rpath,@executable_path/Frameworks -Wl,-dead_strip -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/lib/swift -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos -o "./d8" -Wl,-filelist,"./d8.rsp" -framework CoreFoundation -framework CoreGraphics -framework CoreText -framework Foundation   

Undefined symbols for architecture arm64:

  "v8::internal::trap_handler::RegisterDefaultTrapHandler()", referenced from:

      v8::internal::trap_handler::EnableTrapHandler(bool) in handler-outside.o

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Traceback (most recent call last):

  File "../../build/toolchain/apple/linker_driver.py", line 305, in <module>

    Main(sys.argv)

  File "../../build/toolchain/apple/linker_driver.py", line 98, in Main

    subprocess.check_call(compiler_driver_args, env=env)

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 190, in check_call

    raise CalledProcessError(retcode, cmd)

subprocess.CalledProcessError: Command '['../../third_party/llvm-build/Release+Asserts/bin/clang++', '-B', '../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/', '-Wl,-fatal_warnings', '-target', 'arm64-apple-ios10', '-nostdlib++', '-isysroot', '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk', '-Wl,-ObjC', '-Wl,-rpath,@executable_path/Frameworks', '-Wl,-dead_strip', '-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/lib/swift', '-L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos', '-o', './d8', '-Wl,-filelist,./d8.rsp', '-framework', 'CoreFoundation', '-framework', 'CoreGraphics', '-framework', 'CoreText', '-framework', 'Foundation']' returned non-zero exit status 1

[3207/3507] CXX obj/test/unittests/unittests_sources/instruction-selector-arm64-unittest.o

ninja: build stopped: subcommand failed.

[Clemens Backes]

Hm, that symbol is defined in src/trap-handler/handler-outside-posix.cc, which should be included for iOS builds. Can you check if you have a handler-outside-posix.o file in the output directory, and if it contains the RegisterDefaultTrapHandler symbol?

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/8a5a2e52-d7ef-4824-993a-39b8829dca8dn%40googlegroups.com.

[DEVANSH M KAUSHIK]

Yes, handler-outside-posix.o is present at ***/v8/v8/out/release-ios/clang_x64_v8_arm64/obj/v8_base_without_compiler/ and 
the "objdump -t handler-outside-posix.o" is : 

handler-outside-posix.o: file format mach-o 64-bit x86-64

SYMBOL TABLE:

0000000000002db8 l     O __DATA,__bss __ZN2v88internal12trap_handler12_GLOBAL__N_138g_is_default_signal_handler_registeredE

0000000000002dc0 l     O __DATA,__bss __ZN2v88internal12trap_handler12_GLOBAL__N_113g_old_handlerE

0000000000000060 g     F __TEXT,__text __ZN2v88internal12trap_handler17RemoveTrapHandlerEv

0000000000000000 g     F __TEXT,__text __ZN2v88internal12trap_handler26RegisterDefaultTrapHandlerEv

0000000000000000         *UND* __ZN2v88internal12trap_handler12HandleSignalEiP9__siginfoPv

0000000000000000         *UND* _sigaction

It looks like this object file is created for x86-64 while the targeted build architecture is arm64.

==============gn args===================

# Set build arguments here. See `gn help buildargs`.

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

target_cpu = "arm64"                  # "x64" for a simulator build.

target_os = "ios"

v8_enable_i18n_support = false        # Produces a smaller binary.

v8_monolithic = true                  # Enable the v8_monolith target.

v8_use_external_startup_data = false  # The snaphot is included in the binary.

v8_enable_pointer_compression = false # Unsupported on iOS.

ios_enable_code_signing=false

==================================================

build commands  :

1. gn gen out/release-ios

2. set args.gn as above

3. ninja -C out/release-ios

Thanks and Regards,

Devansh Mohan Kaushik

[DEVANSH M KAUSHIK]

Indeed, only the "arm64 ios" build is failing with above- mentioned inking errors i.e. :

[3202/3507] LINK ./d8

FAILED: d8 

TOOL_VERSION=1628482238 ../../build/toolchain/apple/linker_driver.py -Wcrl,strippath,../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip --deterministic ../../third_party/llvm-build/Release+Asserts/bin/clang++ -B ../../../../../../../../Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/  -Wl,-fatal_warnings -target arm64-apple-ios10 -nostdlib++ -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk -Wl,-ObjC -Wl,-rpath,@executable_path/Frameworks -Wl,-dead_strip -L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.5.sdk/usr/lib/swift -L/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos -o "./d8" -Wl,-filelist,"./d8.rsp" -framework CoreFoundation -framework CoreGraphics -framework CoreText -framework Foundation   

Undefined symbols for architecture arm64:

  "v8::internal::trap_handler::RegisterDefaultTrapHandler()", referenced from:

      v8::internal::trap_handler::EnableTrapHandler(bool) in handler-outside.o

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

I tried for  target_cpu = "x64" i.e. ios simulator and everything worked fine perfectly.  

The build is only failing for the arm64 ios.

Mac Big Sur 11.3.1. 

v8 version : tags/8.5.188 as well as at detached HEAD 5d18f75b7b9fc60fc01300334a938145c9e2a2aa. 

other information : 

 xcode :  12.5.1

clang --version : Apple clang version 12.0.5 (clang-1205.0.22.11)

Please let me know if any other information is required or if I need to report it to some other forum as well.

Thanks and Regards,

Devansh Mohan Kaushik