@*.cppm.o.modmap files not found by clang-tidy?

Development
,
1

is it a clang-tidy problem oder a wrong CMake generated compile_commands.jsonfile?

Running clang-tidy for 4 files out of 4 in compilation database ...
[1/4][6.3s] /usr/local/Cellar/llvm/21.1.6/bin/clang-tidy -checks=-*,clang-* -p=/Users/clausklein/Workspace/cpp/boost-git/build /usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.compat.cppm
error: no such file or directory: '@CMakeFiles/__cmake_cxx26.dir/usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.compat.cppm.o.modmap' [clang-diagnostic-error]
/usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.compat.cppm:84:15: error: module 'std' not found [clang-diagnostic-error]
   84 | export import std;
      |        ~~~~~~~^~~
2 errors generated.
Error while processing /usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.compat.cppm.
Found compiler error(s).

[2/4][6.6s] /usr/local/Cellar/llvm/21.1.6/bin/clang-tidy -checks=-*,clang-* -p=/Users/clausklein/Workspace/cpp/boost-git/build /usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.cppm
error: no such file or directory: '@CMakeFiles/__cmake_cxx26.dir/usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.cppm.o.modmap' [clang-diagnostic-error]
1 error generated.
Error while processing /usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.cppm.
Found compiler error(s).

[3/4][7.2s] /usr/local/Cellar/llvm/21.1.6/bin/clang-tidy -checks=-*,clang-* -p=/Users/clausklein/Workspace/cpp/boost-git/build /Users/clausklein/Workspace/cpp/boost-git/libs/type_index/modules/boost_type_index.cppm
[4/4][8.4s] /usr/local/Cellar/llvm/21.1.6/bin/clang-tidy -checks=-*,clang-* -p=/Users/clausklein/Workspace/cpp/boost-git/build /Users/clausklein/Workspace/cpp/boost-git/libs/any/modules/boost_any.cppm
bash-5.3$ find . -name '*.modmap'
./CMakeFiles/__cmake_cxx23.dir/usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.compat.cppm.o.modmap
./CMakeFiles/__cmake_cxx23.dir/usr/local/Cellar/llvm/21.1.6/share/libc++/v1/std.cppm.o.modmap
./libs/any/CMakeFiles/boost_any.dir/modules/boost_any.cppm.o.modmap
./libs/type_index/CMakeFiles/boost_type_index.dir/modules/boost_type_index.cppm.o.modmap
bash-5.3$
2

compile_commands.json (5.2 KB)

All file paths related to cppm files are relative? Is this right?

bash-5.3$ /usr/local/bin/cmake --version

cmake version 4.2.0