clang --version
clang version 18.1.8+libcxx
Target: x86_64-pc-linux-musl
Thread model: posix
InstalledDir: /usr/lib/llvm/18/bin
Configuration file: /etc/clang/x86_64-pc-linux-musl-clang.cfg

uconv --version
uconv v2.1  ICU 76.0.1

[131/2641] /usr/lib/ccache/bin/clang++ -DENABLE_COMPILETIME_FORMAT_CHECK -DLibUnicode_EXPORTS -D_FILE_OFFSET_BITS=64 -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999 -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom/Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom/Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../.. -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build  -O3 -pipe -march=native -D_FORTIFY_SOURCE=3 -g0 -Werror=odr -Werror=conditional-type-mismatch -Werror=pointer-type-mismatch -Werror=selector-type-mismatch -Werror=strict-aliasing -flto -Wno-register -stdlib=libc++ -std=c++23 -fPIC -fcolor-diagnostics -Wall -Wextra -fno-exceptions -ffp-contract=off -Wcast-qual -Wformat=2 -Wimplicit-fallthrough -Wmissing-declarations -Wsuggest-override -Wno-invalid-offsetof -Wno-unknown-warning-option -Wno-unused-command-line-argument -Wpadded-bitfield -Werror -fconstexpr-steps=16777216 -Wmissing-prototypes -Wno-implicit-const-int-float-conversion -Wno-user-defined-literals -Wno-vla-cxx-extension -Wno-unqualified-std-cast-call -fno-semantic-interposition -fvisibility-inlines-hidden -fstack-protector-strong -fstrict-flex-arrays=2 -Wno-maybe-uninitialized -Wno-shorten-64-to-32 -fsigned-char -ggnu-pubnames -fPIC -O2 -g1 -Wno-overloaded-virtual -Wno-unused-private-field -MD -MT Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o -MF Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o.d -o Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o -c /var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp
FAILED: Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o
/usr/lib/ccache/bin/clang++ -DENABLE_COMPILETIME_FORMAT_CHECK -DLibUnicode_EXPORTS -D_FILE_OFFSET_BITS=64 -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999 -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom/Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build/Lagom/Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../.. -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland/Libraries -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Meta/Lagom/../../Userland/Services -I/var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999_build  -O3 -pipe -march=native -D_FORTIFY_SOURCE=3 -g0 -Werror=odr -Werror=conditional-type-mismatch -Werror=pointer-type-mismatch -Werror=selector-type-mismatch -Werror=strict-aliasing -flto -Wno-register -stdlib=libc++ -std=c++23 -fPIC -fcolor-diagnostics -Wall -Wextra -fno-exceptions -ffp-contract=off -Wcast-qual -Wformat=2 -Wimplicit-fallthrough -Wmissing-declarations -Wsuggest-override -Wno-invalid-offsetof -Wno-unknown-warning-option -Wno-unused-command-line-argument -Wpadded-bitfield -Werror -fconstexpr-steps=16777216 -Wmissing-prototypes -Wno-implicit-const-int-float-conversion -Wno-user-defined-literals -Wno-vla-cxx-extension -Wno-unqualified-std-cast-call -fno-semantic-interposition -fvisibility-inlines-hidden -fstack-protector-strong -fstrict-flex-arrays=2 -Wno-maybe-uninitialized -Wno-shorten-64-to-32 -fsigned-char -ggnu-pubnames -fPIC -O2 -g1 -Wno-overloaded-virtual -Wno-unused-private-field -MD -MT Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o -MF Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o.d -o Lagom/Userland/Libraries/LibUnicode/CMakeFiles/LibUnicode.dir/Locale.cpp.o -c /var/tmp/portage/www-client/ladybird-9999/work/ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp
In file included from ../ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp:12:
In file included from ../ladybird-9999/Userland/Libraries/LibUnicode/ICU.h:16:
/usr/include/unicode/locid.h:1274:37: error: chosen constructor is explicit in copy-initialization
 1274 |     if (U_FAILURE(status)) { return {}; }
      |                                     ^~
../ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp:505:26: note: in instantiation of function template specialization 'icu::Locale::getUnicodeKeywordValue<AK::StringBuilder>' requested here
  505 |     auto result = locale.getUnicodeKeywordValue<StringBuilder>(icu_string_piece(key), status);
      |                          ^
../ladybird-9999/AK/StringBuilder.h:26:14: note: explicit constructor declared here
   26 |     explicit StringBuilder(size_t initial_capacity = inline_capacity);
      |              ^
In file included from ../ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp:12:
In file included from ../ladybird-9999/Userland/Libraries/LibUnicode/ICU.h:16:
/usr/include/unicode/locid.h:1188:37: error: chosen constructor is explicit in copy-initialization
 1188 |     if (U_FAILURE(status)) { return {}; }
      |                                     ^~
../ladybird-9999/Userland/Libraries/LibUnicode/Locale.cpp:554:47: note: in instantiation of function template specialization 'icu::Locale::toLanguageTag<AK::StringBuilder>' requested here
  554 |             auto locale_name = locale_list[i].toLanguageTag<StringBuilder>(status);
      |                                               ^
../ladybird-9999/AK/StringBuilder.h:26:14: note: explicit constructor declared here
   26 |     explicit StringBuilder(size_t initial_capacity = inline_capacity);
      |              ^
2 errors generated.
ninja: build stopped: subcommand failed.