<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/146536>146536</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Clang breaks debuggers when using c++ modules
</td>
</tr>
<tr>
<th>Labels</th>
<td>
clang
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
Yuria-Shikibe
</td>
</tr>
</table>
<pre>
Toolchain: LLVM 20.1.7 + MSVC STL; (Both clang and clang-cl are tested)
Build system: xmake;
OS: Windows11;
## The formatted view is broken: （Tried both vsdbg and clion embedded LLDB 9.0)
Using `#include <vector>`, formatted:
Using `import std`. broken:
Build System Log
```
[ 2%]: <mo_yanxi> generating.module.deps src\main.cpp
checking for D:\lib\LLVM\bin\clang-scan-deps.exe ... ok
[ 2%]: <mo_yanxi> generating.module.deps C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\modules\std.ixx
[ 2%]: <mo_yanxi> generating.module.deps C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\modules\std.compat.ixx
D:\lib\LLVM\bin\clang-scan-deps.exe --format=p1689 -- D:\lib\LLVM\bin\clang.exe -x c++ -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -c src\main.cpp -o build\.objs\mo_yanxi\windows\x64\debug\src\main.cpp.obj
D:\lib\LLVM\bin\clang-scan-deps.exe --format=p1689 -- D:\lib\LLVM\bin\clang.exe -x c++ -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -c "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\modules\\std.ixx" -o build\.objs\mo_yanxi\windows\x64\debug\a609f1d98a904a32bb8edcee0d1c8530\std.ixx.obj
D:\lib\LLVM\bin\clang-scan-deps.exe --format=p1689 -- D:\lib\LLVM\bin\clang.exe -x c++ -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -c "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\modules\\std.compat.ixx" -o build\.objs\mo_yanxi\windows\x64\debug\a609f1d98a904a32bb8edcee0d1c8530\std.compat.ixx.obj
checking for flags (clang_module_file) ... ok
checking for flags (clang_module_output) ... ok
[ 17%]: <mo_yanxi> compiling.module.bmi.debug std
D:\lib\LLVM\bin\clang.exe -c -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -x c++-module --precompile -Wno-include-angled-in-module-purview -Wno-reserved-module-identifier -Wno-deprecated-declarations -fmodule-output=build\.gens\mo_yanxi\windows\x64\debug\rules\bmi\cache\interfaces\5451787d\std.pcm -o build\.gens\mo_yanxi\windows\x64\debug\rules\bmi\cache\interfaces\5451787d\std.pcm "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\modules\\std.ixx"
checking for flags (-fdiagnostics-color=always) ... ok
checking for flags (-fansi-escape-codes) ... ok
[ 25%]: compiling.debug C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.44.35207\modules\std.ixx
D:\lib\LLVM\bin\clang.exe -c -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -x c++ -Wno-include-angled-in-module-purview -Wno-reserved-module-identifier -Wno-deprecated-declarations -o build\.objs\mo_yanxi\windows\x64\debug\a609f1d98a904a32bb8edcee0d1c8530\std.ixx.obj "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.44.35207\\modules\\std.ixx"
[ 43%]: compiling.debug src\main.cpp
D:\lib\LLVM\bin\clang.exe -c -Qunused-arguments -m64 --target=x86_64-windows-msvc -fms-runtime-lib=dll_dbg -g -Wall -O0 -std=c++23 -fexceptions -fcxx-exceptions -finput-charset=UTF-8 -fexec-charset=UTF-8 -fmodule-file=std=build\.gens\mo_yanxi\windows\x64\debug\rules\bmi\cache\interfaces\5451787d\std.pcm -o build\.objs\mo_yanxi\windows\x64\debug\src\main.cpp.obj src\main.cpp
checking for flags (-MMD -MF) ... ok
checking for D:\lib\LLVM\bin\clang++.exe ... ok
checking for flags (clang_ms_runtime_lib) ... ok
[ 60%]: linking.debug mo_yanxi.exe
D:\lib\LLVM\bin\clang++.exe -o build\windows\x64\debug\mo_yanxi.exe build\.objs\mo_yanxi\windows\x64\debug\src\main.cpp.obj build\.objs\mo_yanxi\windows\x64\debug\a609f1d98a904a32bb8edcee0d1c8530\std.ixx.obj -m64 --target=x86_64-windows-msvc -nostdlib -g
checking for clang ... D:\lib\LLVM\bin\clang.exe
checking for the c compiler (cc) ... clang.exe
[100%]: build ok, spent 11.016s
```
## Complete lose track of some structs defined in modules:
Normal, complied by msvc:
Blind, complied by clang:
(Uses the same compile options as the above)
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWV1v2zoS_TX0C0GBIkVZevBDLNfAAsneXSRtsU8BRY5k3kiiIVKJ8-8XlOTaSTdN7t30fhYwUNfUzBzNnDMkJ9I5U3cAKyTWSGwWcvA726_-M_RGkuuduTMlLEqrH1c31jZqJ02H-AW-vPx0hRmN4miJEVvjq-tPBb6-uUR8jRHL1tbvsGpkV2PZ6ekbUQ2WPWAPzoNGLEf0Yj2YRmP36Dy0we2hlXcw-qAXP12HXz6bTtsHF8eIrxG9CB_GEeP4Zge4sn0rvQeN7w08YONw2ds7GBGiD1u0LlCW3fQGNC4DonunyyMiYzsMbQlag8aXl5s1ziM6ofroTFdjlFLEuOlUM2jAiBf3oLztEf8wrhSn6IhfHKHFSKz_0coakNgglu2837uwzLaIbWvjd0MZKdsith0c9ER6L9Wuhc47xLbSORi_VLqMKxAxEcuckkSWCZF5EhPOY6qWwGlWwgT1vSJmILSoKkk4g5QkseKklCCJSAVlEENWsXSOeJYf0-5t77HzGqU0OiX_fbPBl5RXoBWhkpckiVlGcpYuCcgsSaVSArR652zkVC9ZWhLgnJKEJZRITTmRWpZClEqImH_JxsTh65HD-NLWgbuBIdOHXiCxxpghJgKkQExetPb2UXYHg_gHXEMHvfSmq6PW6qGBSMPeYdcrJIpWmi5S-z2iF2oH6i7kvbI9Do6QKBpTIlEELSJRlKZDopik5pTsSPATwQFwFEXY3v1qKMUU7F-9rXvZ4q1pwCFRXBnVW2crjz8ZN8gGX_tBG4tEwShjSBSFbduhM_4RieJTgUQROshoeT3-N06iJIm4YHQZXnWMGJad15E5HP5UeJVt99LPsH9ZdQiZGgnim32cZjkm5LX6TnYHrBBbh-5L_j10gwNNZF8PI5sxadMEE-JlX0NwfcjS2zQhD1M7Ja27V5hUrSP90HnTAgmx-EY3zW3okaTG5LNsGkx-opgEgfPNHI1xTCo4KNh7YzuHSaUOB_LkB9PtB0_UTvZuDP7xZkuy0QrU1z-rZ2THxOIyiAqJIrLlz27M9lx2UcyvgERxSBMkCg3lUIcyPHESDH-U4peXAjE26-d_SOibKjoJ6ZmWjnI6U9RJVF_p6om0zroBY7-SFzKleRXrPJM5TSRnZZmBVgBUxyoTnJ5iBKcYY_yDN38R3px15e9Nn1OoufM82a-rRtYuHIzH2t9OQG8r04Rj3Gl_foONHfx-8E-swi4ZL1_cJQMy05xtkmVrovHtxoPbq1yfmKr-5Az9ojQyZQETsu9hyg1g8rmzZD7qE9nVDWhiuvlRsh_68X4xPtWDg_4e9HHRaOi8qQz007qG4Fd60ESDamQ4oEyAZ4O5gnzzhYw1dG8kYz_zu2zDU0qqHSBRmM5DX0k1LolExMtsqWde7lX7hPjfO9Yfsg9MDeBFgZFKG1l31nmjHFG2Cbe8jWwe5KN7gz5JJTtnCDgl90CU1eC-0icTJ32eBDmp8Pc7X_-9lP-bqPy3OKL8sTUW6J7wl-n-1c32b8HCY_cf93y-mYL9LjvA_3OjemUscWqJV1cbTK62L3fPV4o-VeHp9OKbpyN3O9f4Nrh83n5TeuJjY7q7ExuPaQihXufiGayzlL6Uv3Pf75T_799c3qSpsFfqxpSY1M8LM019Q_bfoOvnxn4HWM0dA_qxvOpYzHMjJNYxPavpmJZQblZgt4fO4ziOaJy657O4L-Pjwrb7BjzgxjrAvpfqDtsKO9sCdr4flHdYQ2U60Nh0-NjuxtnmP8NlrwmxAtJmHC8_4pCZefb5TmNInSQlhTIjkkNOkphpkqd5TPJUyLiqKsFTehpDNqbTzzFNpH1XUEmeZMuKayIEX5KEQUWkSgVJl0kmlaiAJkdQLPvowI1FdbKFY12xnXuonNZkae_DPWihV1znPJcLWMVLEfNlzhO-2K3iUpa5UirnJSiWljHL4ixXrCwTSdMlLMyKUSboksZxEouERTyTqRS5lkuguYxjlFBopWmiprlvI9vXC-PcAKs4SQVPF40soXHjn0AYm4XOkNgs-lUwIOVQO5TQxjjvTi688Q2sipHvZQ_yLjCmHOoaeocfdtDhYRyUH48fM4cWQ9-svpH84H_-h-x7-zMoj9h2xBvyP0O-X7H_BgAA__8MOxQy">