[boost-exception] build failure

[Semphriss]

Host Environment

• OS: Ubuntu 20.04 LTS
• Compiler: revision

To Reproduce
Steps to reproduce the behavior:
./vcpkg install boost-exception:wasm32-emscripten

Failure logs

[1/2] cd /path/to/vcpkg/buildtrees/boost-exception/src/ost-1.78.0-8b4cb912e9.clean/build && /path/to/vcpkg/installed/x64-linux/tools/boost-build/b2 toolset=clang --user-config=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/user-config.jam --stagedir=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/stage --build-dir=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg runtime-link=shared link=static address-model=32 architecture=x86 target-os=linux threadapi=pthread variant=debug --layout=system -sICU_PATH="ICU_PATH-NOTFOUND" --with-atomic --with-random --with-date_time --with-filesystem --with-system --with-thread --with-chrono -j12 -sBOOST_ROOT=/path/to/vcpkg/installed/x64-linux/tools/boost-build -sBOOST_BUILD_PATH=/path/to/vcpkg/installed/x64-linux/tools/boost-build --debug-configuration --debug-building --debug-generators --ignore-site-config --hash -q debug-symbols=on -d +2 threading=multi stage
FAILED: CMakeFiles/boost /path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/CMakeFiles/boost 
cd /path/to/vcpkg/buildtrees/boost-exception/src/ost-1.78.0-8b4cb912e9.clean/build && /path/to/vcpkg/installed/x64-linux/tools/boost-build/b2 toolset=clang --user-config=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/user-config.jam --stagedir=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/stage --build-dir=/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg runtime-link=shared link=static address-model=32 architecture=x86 target-os=linux threadapi=pthread variant=debug --layout=system -sICU_PATH="ICU_PATH-NOTFOUND" --with-atomic --with-random --with-date_time --with-filesystem --with-system --with-thread --with-chrono -j12 -sBOOST_ROOT=/path/to/vcpkg/installed/x64-linux/tools/boost-build -sBOOST_BUILD_PATH=/path/to/vcpkg/installed/x64-linux/tools/boost-build --debug-configuration --debug-building --debug-generators --ignore-site-config --hash -q debug-symbols=on -d +2 threading=multi stage
notice: found boost-build.jam at /path/to/vcpkg/installed/x64-linux/tools/boost-build/boost-build.jam
notice: loading B2 from /path/to/vcpkg/installed/x64-linux/tools/boost-build/src/kernel/bootstrap.jam
notice: Site configuration files will be ignored due to the
notice: --ignore-site-config command-line option.
notice: Loading explicitly specified user configuration file:
    /path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/user-config.jam
notice: Searching '/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg' for user-config configuration file 'user-config.jam'.
notice: Loading user-config configuration file 'user-config.jam' from '/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg'.
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/tools/common.jam:1171: in common.match-command-output from module common
error: '"/path/to/emsdk/upstream/emscripten/em++" --version' returned an invalid $kind string 'emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.1 (1934a98e709b57d3592b8272d3f1264a72c089e4)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

'
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/tools/clang-linux.jam:101: in get-full-version from module clang-linux
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/tools/clang-linux.jam:106: in get-short-version from module clang-linux
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/tools/clang-linux.jam:55: in clang-linux.init from module clang-linux
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build/toolset.jam:44: in toolset.using from module toolset
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/tools/clang.jam:33: in clang.init from module clang
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build/toolset.jam:44: in toolset.using from module toolset
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build/project.jam:1104: in using from module project-rules
/path/to/vcpkg/buildtrees/boost-exception/wasm32-emscripten-dbg/user-config.jam:11: in modules.load from module user-config
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build-system.jam:255: in load-config from module build-system
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build-system.jam:449: in load-configuration-files from module build-system
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/build-system.jam:607: in load from module build-system
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/kernel/modules.jam:294: in import from module modules
/path/to/vcpkg/installed/x64-linux/tools/boost-build/src/kernel/bootstrap.jam:139: in boost-build from module
/path/to/vcpkg/installed/x64-linux/tools/boost-build/boost-build.jam:8: in module scope from module

ninja: build stopped: subcommand failed.

Additional context
This package worked well until a few days ago. It seems like it fails to parse the compiler version.