Created attachment 899831 [details, diff] libcxx patch When building firefox on musl system with llvm-18 and mold, linking libxul.so fails with error: mold: error: ../../../xpcom/base/Unified_cpp_xpcom_base0.o:(__llvm_prf_data): std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>::__init_copy_ctor_external(char const*, unsigned long) (.local) refers to a discarded COMDAT section probably due to an ODR violation The cause seems to a "instrumented/xpcom/base/Unified_cpp_xpcom_base0.o" which has two symbols of "__init_copy_ctor_external". See 3752 and 3980 below % llvm-readelf -C -s Unified_cpp_xpcom_base0.o | grep init_copy 1483: 0000000000000000 0 SECTION LOCAL DEFAULT 1909 .text._ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE25__init_copy_ctor_externalEPKcm 3752: 0000000000000000 196 FUNC WEAK DEFAULT 1909 std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>::__init_copy_ctor_external(char const*, unsigned long) 3753: 0000000000000000 48 OBJECT WEAK HIDDEN 5201 __profc__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE25__init_copy_ctor_externalEPKcm.1075941064311504419 3754: 0000000000000000 64 OBJECT WEAK HIDDEN 5203 __profd__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE25__init_copy_ctor_externalEPKcm.1075941064311504419 3979: 0000000000000000 8 OBJECT WEAK HIDDEN 5202 __profvp__ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE25__init_copy_ctor_externalEPKcm.1075941064311504419 3980: 0000000000000000 196 FUNC WEAK HIDDEN 1909 std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>::__init_copy_ctor_external(char const*, unsigned long) (.local) It is defined in "/usr/include/c++/v1/string:1965". I don't know why two symbols were created, but the problem can be avoided by applying the attached "libcxx-remove-noinline.patch" to libcxx. Other applications that use C++ or Rust build fine, so I think this is a Firefox issue. Confirmed on AMD64+firefox-128.1, AMD64+firefox-129.0, arm64+firefox-129.0
Created attachment 899832 [details] emerge --info
Please include the build.log too.
I'm re-building Firefox to get a log.
I don't know if this is related to this problem, but in fact I could not build firefox even with ld.lld due to the error "undefined symbol rust_eh_personality". This error did not occur when using ld.mold. After I finish the ongoing build, I'll try lld again.
build.log https://drive.google.com/file/d/1AKp7v1sv1zKvvoj_KwS4kPerusyXyKCg full dump of /tmp/portage https://drive.google.com/file/d/1yd0QCp4na9vK91fu_OMUSpT09VWmZhje
(In reply to mojyack from comment #5) > build.log > https://drive.google.com/file/d/1AKp7v1sv1zKvvoj_KwS4kPerusyXyKCg > > full dump of /tmp/portage > https://drive.google.com/file/d/1yd0QCp4na9vK91fu_OMUSpT09VWmZhje Could you compress those with xz -9 for example and upload here?
Created attachment 900427 [details] build.log
(In reply to mojyack from comment #5) > build.log > https://drive.google.com/file/d/1AKp7v1sv1zKvvoj_KwS4kPerusyXyKCg > > full dump of /tmp/portage > https://drive.google.com/file/d/1yd0QCp4na9vK91fu_OMUSpT09VWmZhje (recompressed) full dump of /tmp/portage https://drive.google.com/file/d/1b9OAPKh1hUZXrS9XP9JS4UzhLLY5KE1b
