The problem is I have a project with g++ with v8 13.1 compiled and running with v8_monolith but when I try this new version I can’t compile v8_monolith.
How can I embed this new v8 version ? Can I compile v8 for shared library, please tell me how? Or how is the right way to compile v8_monolith again ? With use_custom_libcxx=false I have errors, but v8gen.py ask for it to compile v8 monolith. Give the way and I will follow it :-) Thanks Juan dos Santos El El lun, 25 ago 2025 a la(s) 12:14, Leszek Swirski <[email protected]> escribió: > Hi Juan, > > Unfortunately we don't support configurations other than the bundled > clang and libc++. Are you trying to use the system clang with the bundled > libc++? A version mismatch there is likely to cause issues. > > - Leszek > > On Mon, Aug 25, 2025 at 4:51 PM Juan dos Santos <[email protected]> > wrote: > >> 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 >>> >>> >>> -- >> -- >> v8-dev mailing list >> [email protected] >> http://groups.google.com/group/v8-dev >> --- >> > You received this message because you are subscribed to the Google Groups >> "v8-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. 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