clang++-19: error: linker command failed with exit code 1 on macOS

[ClausKlein]

bash-5.2$ cmake --workflow --preset release
Executing workflow step 1 of 3: configure preset "release"

Preset CMake variables:

  CMAKE_BUILD_TYPE="RelWithDebInfo"
  CMAKE_CXX_EXTENSIONS:BOOL="FALSE"
  CMAKE_CXX_FLAGS="-Wall -Wextra -Wpedantic -Wno-shadow -Wconversion -Wsign-conversion -Wcast-align -Wcast-qual -Woverloaded-virtual -Wformat=2 -Wno-error"
  CMAKE_CXX_STANDARD="26"
  CMAKE_CXX_STANDARD_REQUIRED:BOOL="TRUE"
  CMAKE_EXPORT_COMPILE_COMMANDS:BOOL="TRUE"
  CMAKE_INSTALL_PREFIX:PATH="/Users/clausklein/Workspace/cpp/beman-project/exemplar/stagedir"
  CMAKE_PREFIX_PATH:STRING="/Users/clausklein/Workspace/cpp/beman-project/exemplar/stagedir"

-- The CXX compiler identification is Clang 19.1.2
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/local/opt/llvm/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done (0.9s)
-- Generating done (0.0s)
-- Build files have been written to: /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/release

Executing workflow step 2 of 3: build preset "release"

[7/10] Linking CXX static library src/beman/exemplar/libbeman.exemplar.a
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: src/beman/exemplar/libbeman.exemplar.a(identity.cpp.o) has no symbols
[9/10] Linking CXX executable examples/beman.exemplar.examples.identity_direct_usage
FAILED: examples/beman.exemplar.examples.identity_direct_usage 
: && /usr/local/opt/llvm/bin/clang++ -Wall -Wextra -Wpedantic -Wno-shadow -Wconversion -Wsign-conversion -Wcast-align -Wcast-qual -Woverloaded-virtual -Wformat=2 -Wno-error -O2 -g -DNDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.1.sdk -mmacosx-version-min=14.7 -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L/usr/local/opt/llvm/lib/c++ examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o -o examples/beman.exemplar.examples.identity_direct_usage  src/beman/exemplar/libbeman.exemplar.a && :
ld: archive member '/' not a mach-o file in '/Users/clausklein/Workspace/cpp/beman-project/exemplar/build/release/src/beman/exemplar/libbeman.exemplar.a'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
bash-5.2$ 

[ClausKlein]

see how to fix it #66