On Tue, Oct 21, 2025 at 3:40 PM ClearScript Developers < [email protected]> wrote:
> An update: We were able to get around these issues by migrating our Linux > builds to the bundled C++ library. > > Support for system C++ libraries seems to be broken in 14.1, at least for > Linux x64 and arm64. MacOS isn't affected but was easy to migrate, but we > haven't been able to migrate our Windows build. > > Question for the V8 team: Is the removal of use_custom_libcxx imminent? > We inherit that flag from Chromium's build configuration, so this would be a question for [email protected]. I only just found out that it is indeed marked deprecated since https://chromium-review.googlesource.com/c/chromium/src/+/5963336. M138 has passed, I don't know what the current plan is. The tracking bug <https://issues.chromium.org/issues/372852985> doesn't look like lots of activity recently. Personally I'd be fine with accepting (reasonably non-intrusive) community-supported patches that keep the system-libc++ build alive for the time being. > On Tuesday, October 14, 2025 at 1:42:29 PM UTC-4 ClearScript Developers > wrote: > >> Greetings! >> >> While building the 14.1 branch tip on Linux, we're seeing compilation >> errors. Our configuration: >> >> fatal_linker_warnings = false >> is_cfi = false >> is_component_build = false >> is_debug = false >> target_cpu = "x64" >> use_custom_libcxx = false >> use_thin_lto = false >> v8_enable_fuzztest = false >> v8_enable_pointer_compression = false >> v8_enable_31bit_smis_on_64bit_arch = false >> v8_enable_temporal_support = false >> v8_monolithic = true >> v8_use_external_startup_data = false >> v8_target_cpu = "x64" >> >> The errors: >> >> FAILED: obj/build/modules/linux-x64/std_core/module.pcm >> ../../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF >> obj/build/modules/linux-x64/std_core/module.pcm.d -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 -D_LIBCPP_BUILDING_LIBRARY -I../../.. -Igen >> -fno-implicit-module-maps -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 -ftrivial-auto-var-init=pattern -O2 >> -fdata-sections -ffunction-sections -fno-unique-section-names >> -fno-omit-frame-pointer -g0 -fvisibility=hidden -Wheader-hygiene >> -Wstring-conversion -Wtautological-overlap-compare -Xclang -add-plugin >> -Xclang find-bad-constructs -Xclang -plugin-arg-find-bad-constructs -Xclang >> check-stack-allocated -Xclang -plugin-arg-find-bad-constructs -Xclang >> check-ipc -Xclang -add-plugin -Xclang raw-ptr-plugin -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang check-raw-ptr-to-stack-allocated -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> disable-check-raw-ptr-to-stack-allocated-error -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> raw-ptr-exclude-path=../../../third_party/dawn/ -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> raw-ptr-exclude-path=../../../build/config/clang/chrome/test/fuzzing/webidl_fuzzing/ >> -fstrict-aliasing -Wundef -fPIC -Wall -Wno-unused-variable >> -Wno-c++11-narrowing -Wno-unused-but-set-variable >> -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 -Werror >> -Wno-exit-time-destructors -std=c++20 -Wno-trigraphs >> -gsimple-template-names -fno-exceptions -fno-rtti >> --sysroot=../../../build/linux/debian_bullseye_amd64-sysroot >> -fvisibility-inlines-hidden -fbuiltin-module-map >> -fmodule-map-file=gen/third_party/libc++/src/include/module.modulemap >> -fmodule-map-file=../../../build/modules/linux-x64/module.modulemap >> -std=c++20 -Wno-invalid-offsetof -Wenum-compare-conditional >> -Wno-nullability-completeness >> -fmodule-map-file=gen/third_party/libc++/src/include/module.modulemap >> -fbuiltin-module-map >> -fmodule-map-file=../../../build/modules/linux-x64/module.modulemap >> -fmodule-file=obj/build/modules/linux-x64/_Builtin_stdarg/module.pcm >> -fmodule-file=obj/build/modules/linux-x64/_Builtin_stddef/module.pcm >> -fmodule-file=obj/build/modules/linux-x64/_Builtin_stdint/module.pcm >> -fmodule-file=obj/build/modules/linux-x64/sys_stage1/module.pcm >> -fmodule-name=std_core -c -x c++ -Xclang -emit-module >> gen/third_party/libc++/src/include/module.modulemap -o >> obj/build/modules/linux-x64/std_core/module.pcm >> While building module 'std_core': >> In file included from <module-includes>:1: >> gen/third_party/libc++/src/include/__cstddef/byte.h:12:10: fatal error: >> '__config' file not found >> 12 | #include <__config> >> | ^~~~~~~~~~ >> 1 error generated. >> [1116/3269] CXX_MODULE obj/build/modules/linux-x64/std_ctype_h/module.pcm >> FAILED: obj/build/modules/linux-x64/std_ctype_h/module.pcm >> ../../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF >> obj/build/modules/linux-x64/std_ctype_h/module.pcm.d -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 -D_LIBCPP_BUILDING_LIBRARY -I../../.. -Igen >> -fno-implicit-module-maps -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 -ftrivial-auto-var-init=pattern -O2 >> -fdata-sections -ffunction-sections -fno-unique-section-names >> -fno-omit-frame-pointer -g0 -fvisibility=hidden -Wheader-hygiene >> -Wstring-conversion -Wtautological-overlap-compare -Xclang -add-plugin >> -Xclang find-bad-constructs -Xclang -plugin-arg-find-bad-constructs -Xclang >> check-stack-allocated -Xclang -plugin-arg-find-bad-constructs -Xclang >> check-ipc -Xclang -add-plugin -Xclang raw-ptr-plugin -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang check-raw-ptr-to-stack-allocated -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> disable-check-raw-ptr-to-stack-allocated-error -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> raw-ptr-exclude-path=../../../third_party/dawn/ -Xclang >> -plugin-arg-raw-ptr-plugin -Xclang >> raw-ptr-exclude-path=../../../build/config/clang/chrome/test/fuzzing/webidl_fuzzing/ >> -fstrict-aliasing -Wundef -fPIC -Wall -Wno-unused-variable >> -Wno-c++11-narrowing -Wno-unused-but-set-variable >> -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 -Werror >> -Wno-exit-time-destructors -std=c++20 -Wno-trigraphs >> -gsimple-template-names -fno-exceptions -fno-rtti >> --sysroot=../../../build/linux/debian_bullseye_amd64-sysroot >> -fvisibility-inlines-hidden -fbuiltin-module-map >> -fmodule-map-file=gen/third_party/libc++/src/include/module.modulemap >> -fmodule-map-file=../../../build/modules/linux-x64/module.modulemap >> -std=c++20 -Wno-invalid-offsetof -Wenum-compare-conditional >> -Wno-nullability-completeness >> -fmodule-map-file=gen/third_party/libc++/src/include/module.modulemap >> -fmodule-map-file=../../../build/modules/linux-x64/module.modulemap >> -fbuiltin-module-map >> -fmodule-file=obj/build/modules/linux-x64/_Builtin_stdarg/module.pcm >> -fmodule-file=obj/build/modules/linux-x64/_Builtin_stddef/module.pcm >> -fmodule-file=obj/build/modules/linux-x64/sys_stage1/module.pcm >> -fmodule-name=std_ctype_h -c -x c++ -Xclang -emit-module >> gen/third_party/libc++/src/include/module.modulemap -o >> obj/build/modules/linux-x64/std_ctype_h/module.pcm >> While building module 'std_ctype_h': >> In file included from <module-includes>:1: >> gen/third_party/libc++/src/include/ctype.h:35:12: error: '__config' file >> not found with <angled> include; use "quotes" instead >> 35 | # include <__config> >> | ^ >> While building module 'std_ctype_h': >> In file included from <module-includes>:1: >> In file included from gen/third_party/libc++/src/include/ctype.h:35: >> gen/third_party/libc++/src/include/__config:13:10: error: '__config_site' >> file not found with <angled> include; use "quotes" instead >> 13 | #include <__config_site> >> | ^ >> gen/third_party/libc++/src/include/__config:14:10: error: >> '__configuration/abi.h' file not found with <angled> include; use "quotes" >> instead >> 14 | #include <__configuration/abi.h> >> | ^ >> While building module 'std_ctype_h': >> In file included from <module-includes>:1: >> In file included from gen/third_party/libc++/src/include/ctype.h:35: >> In file included from gen/third_party/libc++/src/include/__config:14: >> gen/third_party/libc++/src/include/__configuration/abi.h:13:10: fatal >> error: '__config_site' file not found >> 13 | #include <__config_site> >> | ^~~~~~~~~~~~~~~ >> 4 errors generated. >> >> Full log attached. Can someone suggest a solution? >> > -- > -- -- 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]. To view this discussion visit https://groups.google.com/d/msgid/v8-dev/CAKSzg3T8K4KEgw-3wBuKbKFhc0Oz_tWvG67h_6Oub24kGfzoTA%40mail.gmail.com.
