Hi everyone again!
I found some problem with "use_custom_libcxx=false" this is the problem
with v8gen.py .
v8gen.py makes the configuration with "use_custom_libcxx=false" so, with
this, the problem found is "std::bit_cast" not found.
I know I need the las clang with c++20, this is my version "clang version
18.1.3 (1ubuntu1) Target: x86_64-pc-linux-gnu"
I think I have the right libc with this clang version (or I don't ?? )
My disto is Ubuntu 24.04 (docker image:
mcr.microsoft.com/vscode/devcontainers/cpp:1-ubuntu24.04)
Then, I tried to complie with g++ but other errors appears (g++-14 gcc-14):
is_component_build = false
is_debug = false
target_cpu = "x64"
v8_enable_sandbox = true
v8_enable_backtrace = true
v8_enable_disassembler = true
v8_enable_object_print = true
v8_enable_verify_heap = true
dcheck_always_on = false
v8_monolithic = true
v8_use_external_startup_data = false
is_clang=false
use_sysroot=false
Errors:
In file included from
../../third_party/libc++/src/include/__exception/exception_ptr.h:17,
from ../../third_party/libc++/src/include/exception:84,
from ../../third_party/libc++abi/src/src/cxa_vector.cpp:16:
../../third_party/libc++/src/include/__type_traits/decay.h:22:32: error:
expected type-specifier before ‘__decay’
22 | using type _LIBCPP_NODEBUG = __decay(_Tp);
| ^~~~~~~
In file included from
../../third_party/libc++/src/include/__exception/exception_ptr.h:18:
../../third_party/libc++/src/include/__type_traits/is_pointer.h:22:62:
error: there are no arguments to ‘__is_pointer’ that depend on a template
parameter, so a declaration of ‘__is_pointer’ must be available
[-fpermissive]
22 | struct _LIBCPP_NO_SPECIALIZATIONS is_pointer :
_BoolConstant<__is_pointer(_Tp)> {};
|
^~~~~~~~~~~~
../../third_party/libc++/src/include/__type_traits/is_pointer.h:22:62:
note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing
the use of an undeclared name is deprecated)
../../third_party/libc++/src/include/__type_traits/is_pointer.h:22:79:
error: template argument 1 is invalid
22 | struct _LIBCPP_NO_SPECIALIZATIONS is_pointer :
_BoolConstant<__is_pointer(_Tp)> {};
...
....(more errors)
So, v8_monolith.a was not created, and I didn't find any way to do it.
Please help
Juan dos Santos
El lunes, 25 de agosto de 2025 a las 8:03:43 UTC-3, Juan dos Santos
escribió:
> Hi everyone
>
> When I run:
>
> tools/dev/gm.py x64.release
>
> Everything works fine but no libv8_monolith.a is created.
> So, I changed gm.py and add "v8_monolithic = true
> v8_use_external_startup_data = false" and run again.
>
> RELEASE_ARGS_TEMPLATE = f"""\
> is_component_build = false
> is_debug = false
> %s{BUILD_DISTRIBUTION_LINE}
> v8_enable_backtrace = true
> v8_enable_disassembler = true
> v8_enable_object_print = true
> v8_enable_verify_heap = true
> dcheck_always_on = false
> v8_monolithic = true
> v8_use_external_startup_data = false
> """
>
> and then run:
>
> autoninja -C out/x64.release
>
> finally I have libv8_monolith.a
>
> BUT....
>
> if I run this command to make the configuration:
>
> tools/dev/v8gen.py x64.release.sample
>
> and then:
>
> autoninja -C out.gn/x64.release.sample/ v8_monolith
>
> the result is this error (basically std::bit_cast not found):
>
> offline mode
> ninja: Entering directory `out.gn/x64.release.sample/'
> 2.01s load siso config
> [1621/3672] 2m10.11s F CXX obj/torque_base/utils.o
> FAILED: 8b1561ec-f17b-4ae5-b401-647b0752f4f7 "./obj/torque_base/utils.o"
> CXX obj/torque_base/utils.o
> err: exit=1
> ../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF
> obj/torque_base/utils.o.d -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
> -D_FORTIFY_SOURCE=2 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
> -D_LARGEFILE64_SOURCE -D_GNU_SOURCE
> -DCR_CLANG_REVISION=\"llvmorg-21-init-16348-gbd809ffb-17\"
> -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_NONE
> -D_GLIBCXX_ASSERTIONS=1 -DCR_SYSROOT_KEY=20250129T203412Z-1 -DUSE_UDEV
> -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_OZONE=1 -DNDEBUG -DNVALGRIND
> -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DV8_TYPED_ARRAY_MAX_SIZE_IN_HEAP=64
> -DENABLE_GDB_JIT_INTERFACE -DV8_INTL_SUPPORT -DV8_TEMPORAL_SUPPORT
> -DV8_ATOMIC_OBJECT_FIELD_WRITES -DV8_ENABLE_LAZY_SOURCE_POSITIONS
> -DV8_WIN64_UNWINDING_INFO -DV8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH
> -DV8_ENABLE_FUZZTEST -DV8_SHORT_BUILTIN_CALLS -DV8_EXTERNAL_CODE_SPACE
> -DV8_ENABLE_SPARKPLUG -DV8_ENABLE_MAGLEV -DV8_ENABLE_TURBOFAN
> -DV8_ENABLE_WEBASSEMBLY -DV8_ENABLE_CONTINUATION_PRESERVED_EMBEDDER_DATA
> -DV8_ALLOCATION_FOLDING -DV8_ALLOCATION_SITE_TRACKING
> -DV8_ADVANCED_BIGINT_ALGORITHMS -DV8_STATIC_ROOTS -DV8_USE_ZLIB
> -DV8_USE_LIBM_TRIG_FUNCTIONS -DV8_ENABLE_WASM_SIMD256_REVEC
> -DV8_ENABLE_MAGLEV_GRAPH_PRINTER -DV8_ENABLE_BUILTIN_JUMP_TABLE_SWITCH
> -DV8_ENABLE_EXTENSIBLE_RO_SNAPSHOT -DV8_ENABLE_BLACK_ALLOCATED_PAGES
> -DV8_ENABLE_LEAPTIERING -DV8_WASM_RANDOM_FUZZERS
> -DV8_ARRAY_BUFFER_INTERNAL_FIELD_COUNT=0
> -DV8_ARRAY_BUFFER_VIEW_INTERNAL_FIELD_COUNT=0
> -DV8_PROMISE_INTERNAL_FIELD_COUNT=0 -DV8_USE_DEFAULT_HASHER_SECRET=true
> -DV8_COMPRESS_POINTERS -DV8_COMPRESS_POINTERS_IN_SHARED_CAGE
> -DV8_31BIT_SMIS_ON_64BIT_ARCH -DV8_ENABLE_SANDBOX -DV8_DEPRECATION_WARNINGS
> -DV8_IMMINENT_DEPRECATION_WARNINGS -DV8_HAVE_TARGET_OS -DV8_TARGET_OS_LINUX
> -DCPPGC_CAGED_HEAP -DCPPGC_YOUNG_GENERATION -DCPPGC_POINTER_COMPRESSION
> -DCPPGC_ENABLE_LARGER_CAGE -DCPPGC_SLIM_WRITE_BARRIER -DV8_TARGET_ARCH_X64
> -DV8_RUNTIME_CALL_STATS -DABSL_ALLOCATOR_NOTHROW=1 -I../.. -Igen
> -I../../include -Igen/include -I../../third_party/abseil-cpp -Wall -Wextra
> -Wimplicit-fallthrough -Wextra-semi -Wunreachable-code-aggressive -Wgnu
> -Wno-gnu-anonymous-struct -Wno-gnu-conditional-omitted-operand
> -Wno-gnu-include-next -Wno-gnu-label-as-value -Wno-gnu-redeclared-enum
> -Wno-gnu-statement-expression -Wno-gnu-zero-variadic-macro-arguments
> -Wno-zero-length-array -Wthread-safety -Wno-missing-field-initializers
> -Wno-unused-parameter -Wno-psabi -Wloop-analysis
> -Wno-unneeded-internal-declaration -Wno-cast-function-type
> -Wno-thread-safety-reference-return -Wno-nontrivial-memcall -Wshadow
> -Werror -fno-delete-null-pointer-checks -fno-strict-overflow -fno-ident
> -fno-math-errno -fno-strict-aliasing -fstack-protector -funwind-tables
> -fPIC -pthread -fcolor-diagnostics -fmerge-all-constants
> -fno-sized-deallocation
> -fcrash-diagnostics-dir=../../tools/clang/crashreports -mllvm
> -instcombine-lower-dbg-declare=0 -mllvm
> -split-threshold-for-reg-with-hint=0 -ffp-contract=off
> -Wa,--crel,--allow-experimental-crel --target=x86_64-unknown-linux-gnu
> -msse3 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__=
> -D__TIMESTAMP__= -ffile-compilation-dir=. -no-canonical-prefixes -Xclang
> -fmodule-file-home-is-cwd -fno-omit-frame-pointer -g0 -Wheader-hygiene
> -Wstring-conversion -Wtautological-overlap-compare -Wunreachable-code
> -Wctad-maybe-unsupported -Xclang -add-plugin -Xclang blink-gc-plugin
> -Wno-invalid-offsetof -Wshorten-64-to-32 -Wmissing-field-initializers
> -Wunnecessary-virtual-specifier -O3 -fdata-sections -ffunction-sections
> -fno-unique-section-names -fvisibility=default -Wexit-time-destructors
> -Wno-invalid-offsetof -Wenum-compare-conditional
> -Wno-nullability-completeness -std=c++20 -Wno-trigraphs
> -gsimple-template-names
> --sysroot=../../build/linux/debian_bullseye_amd64-sysroot -fexceptions
> -frtti -c ../../src/torque/utils.cc -o obj/torque_base/utils.o
> build step: cxx "./obj/torque_base/utils.o"
> siso_rule: clang/cxx
> stderr:
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:18:10: error: no template named 'bit_cast'
> in namespace 'std'; did you mean simply 'bit_cast'?
> 18 | return std::bit_cast<uint64_t>(d);
> | ^~~~~~~~~~~~~
> | bit_cast
> ../../src/base/macros.h:137:16: note: 'bit_cast' declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:18:10: error: no template named 'bit_cast'
> in namespace 'std'; did you mean simply 'bit_cast'?
> 18 | return std::bit_cast<uint64_t>(d);
> | ^~~~~~~~~~~~~
> | bit_cast
> ../../src/base/macros.h:137:16: note: 'bit_cast' declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:17:27: error: constexpr function never
> produces a constant expression [-Winvalid-constexpr]
> 17 | inline constexpr uint64_t double_to_uint64(double d) {
> | ^~~~~~~~~~~~~~~~
> ../../src/base/numbers/double.h:18:10: note: non-constexpr function
> 'bit_cast<unsigned long, double>' cannot be used in a constant expression
> 18 | return std::bit_cast<uint64_t>(d);
> | ^
> ../../src/base/macros.h:137:16: note: declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:21:10: error: no template named 'bit_cast'
> in namespace 'std'; did you mean simply 'bit_cast'?
> 21 | return std::bit_cast<double>(d64);
> | ^~~~~~~~~~~~~
> | bit_cast
> ../../src/base/macros.h:137:16: note: 'bit_cast' declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:21:10: error: no template named 'bit_cast'
> in namespace 'std'; did you mean simply 'bit_cast'?
> 21 | return std::bit_cast<double>(d64);
> | ^~~~~~~~~~~~~
> | bit_cast
> ../../src/base/macros.h:137:16: note: 'bit_cast' declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> In file included from ../../src/torque/utils.cc:15:
> In file included from ../../src/torque/ast.h:17:
> In file included from ../../src/numbers/integer-literal.h:10:
> In file included from ../../src/common/globals.h:22:
> ../../src/base/numbers/double.h:20:25: error: constexpr function never
> produces a constant expression [-Winvalid-constexpr]
> 20 | inline constexpr double uint64_to_double(uint64_t d64) {
> | ^~~~~~~~~~~~~~~~
> ../../src/base/numbers/double.h:21:10: note: non-constexpr function
> 'bit_cast<double, unsigned long>' cannot be used in a constant expression
> 21 | return std::bit_cast<double>(d64);
> | ^
> ../../src/base/macros.h:137:16: note: declared here
> 137 | V8_INLINE Dest bit_cast(Source const& source) {
> | ^
> 6 errors generated.
>
> build failed
> local:1622 remote:0 cache:0 cache-write:0(err:0) fallback:0 retry:0
> skip:228
> fs: ops: 79691(err:9091) / r:6974(err:0) 458.69MiB / w:1134(err:0)
> 124.94MiB
> resource/capa used(err) wait-avg | s m | serv-avg | s m |
> localexec/8 468(1) 1m04.64s |▂ ▂▂▆█ | 2.09s | ▂▂█ ▂ |
>
> 2m10.34s Build Failure: 1622 done 1 failed 2050 remaining - 12.44/s
> 1 steps failed: exit=1
> see ./out.gn/x64.release.sample/siso_output for full command line and
> output
> or ./out.gn/x64.release.sample/siso.INFO
>
> use ./out.gn/x64.release.sample/siso_failed_commands.sh to re-run failed
> commands
>
>
>
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