<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/62451>62451</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
`clang-tidy` fails when using MSVC precompiled headers
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
Tolker-KU
</td>
</tr>
</table>
<pre>
Configuring clang-tidy from CMake and using MSVC precompiled headers makes clang-tidy fail with the error
```
error: unable to handle compilation, expected exactly one compiler job in
' "C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\Llvm\\x64\\bin\\clang-tool"
"-cc1" "-triple" "x86_64-pc-windows-msvc19.34.31944" "-fsyntax-only" "-disable-free" "-clear-ast-before-backend"
"-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "cmake_pch.cxx" "-mrelocation-model" "pic" "-pic-level" "2"
"-mframe-pointer=none" "-relaxed-aliasing" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases"
"-funwind-tables=2" "-target-cpu" "x86-64" "-mllvm" "-x86-asm-syntax=intel" "-tune-cpu" "generic" "-D_DEBUG" "-D_MT" "-D_DLL"
"--dependent-lib=msvcrtd" "--dependent-lib=oldnames" "-stack-protector" "2" "-fms-volatile" "-fdiagnostics-format" "msvc"
"-gno-column-info" "-gcodeview" "-debug-info-kind=constructor"
"-fcoverage-compilation-dir=C:\\debug_info\\out\\build\\x64-debug"
"-resource-dir" "C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\Llvm\\x64\\lib\\clang\\15.0.1"
"-building-pch-with-obj" "-fpch-instantiate-templates"
"-pch-through-header=C:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx"
"-include" "C:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx"
"-fdeprecated-macro" "-fdebug-compilation-dir=C:\\debug_info\\out\\build\\x64-debug" "-ferror-limit" "19"
"-fno-use-cxa-atexit" "-fms-extensions" "-fms-compatibility" "-fms-compatibility-version=19.34.31944"
"-std=c++14" "-fdelayed-template-parsing" "-faddrsig"
"-x" "c++-header" "C:\\debug_info\\out\\build\\x64-debug\\CMakeFiles\\debug_info.dir\\cmake_pch.cxx";
"C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\Llvm\\x64\\bin\\clang-tool"
"-cc1" "-triple" "x86_64-pc-windows-msvc19.34.31944" "-fsyntax-only" "-disable-free" "-clear-ast-before-backend"
"-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "cmake_pch.cxx" "-mrelocation-model" "pic" "-pic-level" "2"
"-mframe-pointer=none" "-relaxed-aliasing" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases"
"-funwind-tables=2" "-target-cpu" "x86-64" "-mllvm" "-x86-asm-syntax=intel" "-tune-cpu" "generic" "-mllvm"
"-treat-scalable-fixed-error-as-warning" "-D_DEBUG" "-D_MT" "-D_DLL" "--dependent-lib=msvcrtd" "--dependent-lib=oldnames"
"-stack-protector" "2" "-fms-volatile" "-fdiagnostics-format" "msvc" "-gno-column-info" "-gcodeview"
"-debug-info-kind=constructor" "-fcoverage-compilation-dir=C:\\debug_info\\out\\build\\x64-debug" "-resource-dir"
"C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\Llvm\\x64\\lib\\clang\\15.0.1"
"-building-pch-with-obj" "-fpch-instantiate-templates"
"-include-pch" "C:debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.pch"
"-pch-through-header=C:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx"
"-include" "C:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx"
"-fdeprecated-macro" "-fdebug-compilation-dir=C:\\debug_info\\out\\build\\x64-debug" "-ferror-limit" "19"
"-fno-use-cxa-atexit" "-fms-extensions" "-fms-compatibility" "-fms-compatibility-version=19.34.31944" "-std=c++14"
"-fdelayed-template-parsing" "-faddrsig"
"-x" "c++" "C:\\debug_info\\out\\build\\x64-debug\\CMakeFiles\\debug_info.dir\\cmake_pch.cxx"; ' [clang-diagnostic-error]
```
when compiling the precompiled header. The above error is produced by the below invocation
```
"C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe"
-E __run_co_compile --tidy=clang-tidy;--extra-arg-before=--driver-mode=cl
--source=C:\debug_info\out\build\x64-debug\CMakeFiles\debug_info.dir\cmake_pch.cxx --
C:\PROGRA~1\MIB055~1\2022\PROFES~1\VC\Tools\MSVC\1434~1.319\bin\Hostx64\x64\cl.exe
/nologo /TP /DWIN32 /D_WINDOWS /EHsc /Ob0 /Od /RTC1 -MDd -Zi
/YcC:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx
/FpC:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/./cmake_pch.cxx.pch
/FIC:/debug_info/out/build/x64-debug/CMakeFiles/debug_info.dir/cmake_pch.hxx
/showIncludes
/FoCMakeFiles\debug_info.dir\cmake_pch.cxx.obj
/FdCMakeFiles\debug_info.dir\
/FS
-c C:\debug_info\out\build\x64-debug\CMakeFiles\debug_info.dir\cmake_pch.cxx
```
The build completes with both cl.exe and clang-cl.exe when disabling clang-tidy.
```cmake
# CMakeLists.txt
cmake_minimum_required(VERSION 3.25)
project(debug_info)
set(CMAKE_CXX_CLANG_TIDY clang-tidy)
add_executable(debug_info main.cpp)
target_precompile_headers(debug_info PRIVATE <iostream>)
```
```cpp
// main.cpp
#include <iostream>
int main() {
std::cout << "Hello, World!\n";
return 0;
}
```
```
>>> clang-tidy --version
LLVM (http://llvm.org/):
LLVM version 15.0.1
Optimized build.
Default target: x86_64-pc-windows-msvc
Host CPU: skylake
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWVtv2zgW_jXMC0HDlmwnfvCD48tMMElTJGk6sy8GRR7bbChSS1KOsw_z2xckdbObdlqg2VlgChiWeDmH1He-cxFFrRVbBTBFo0s0WpzR0u20mT5o-QSG_PbhLNP8ZTrXaiO2pRFqi5mkakuc4C94Y3SO5zf0CTBVHJfWj9_cP85xYYDpvBASON4B5WAszukT2CNxKiR-Fm6H3Q4wGKMN6i9Qf1b9j_vVLzTjeDrDpaKZBOw03lHFJeC4EnVCK5TMMRwKYA44hgNlTr5greo5YPAnnWGhcLVEco5RksxROkOjORrN3xu9NTTHKyHBxq4bwYy2euPwo7AllfjelVzoOJj0k6SR3IC1QisqY8_jPF4ftJaVrmu5z-PdYTyMN5lQ8aYCRmuJkqTeXkIYG6Ak8bskzohCQtU6XIzX4yEpGHkWiutnS3K7Z4NJLx320sFkOKylNvZFOXogWsmXuo8L6zEkGwO1PsIkUEOodSSDjTZAMsqeQPGj3dSCUu5zsgcjNgJMRyujhpM9lSUQRXOw9VBOhSIbIWN31cs8I9YF2_XY4dDMNCA1C8YkueYgq4FCsHpKIRiRsG-GkqMt5htDcyCFFsqBQelCadU8pAFJD8AJlYJ6tjYg5dTtCBijdNO1KQjTyhnKHEoXnlvVgNLE6FJxobbEyzVbZ1pZZ0rmtIkrVAA0e9uUyluLOA-iRekiaWxLzRYcYUXZ2peMGyPmHvC64YeozUk0LEoX_kllo6lU0NGzBQWmxW6xXiwvP_zSNm8eOkPX10dQEg4FKA7KESkylC48xYzjtcRn41ryI7NbR9kTKYx24EHp2KtC3ZK99p7b0JpsuKBbpa0TzJKNNjl11ZBf_BjOrdKEaVnmigi1aSy3ZZrDXsBzQ0zIym2YQp6E4ihddCx1YiGm92DoFkgnqhAuPJHaMBEUrsOaoa1LV3lzKSRvPDwufLyAAatLwyDojPv7O8OPt1sbfuLtYNTr9wbH2w4P5glfsB3xMZvo7FNjM98plHVUOUEdEAd5Iak7pb-f5nZGl9sdiVmhRjVZdSBNVh7PZBXBTFYdJFch20R4ujK9gOaqjSi7KqI0awvFZMmhC_nbL7rh4DMhdcBJTplpg0uk5I_lmNcbsiSRIhe12wwmRz7to1dpgbADJdTBoZkXvBEODpRnke32-m1SJzIhhXv54oDPB14UpYvTNNSsbl3wPpRcouRyMOzAIekL8IY4pKDmKD5Tzo0VJ75UJ41KX82pU6_6PiRDs2PxExXB6NFjTtIXSi-PypefdcXPuuIfU1fUito9OQPUEcuojJQQHp8Ynqglz9SoDk7fUJa8XnF8R0XSjUJvUZZ8a0HSkv4vy5I3LEg-L0X-L8LW_7QeqWoCr6OTNH5wUVAr_1kF_dOroC_UP12cvrkK-mIR9DdWPzgcp4wuY8XRBswY9dFo8eq5Tvx_3oGqDmmE2oYDoc_PkHr4YQeYZnpfHRdhYXFhNC8ZcJy9BLEMpH7GQu2rbP_6og1CpyHuy_GtCm4nkW2u81yrczSaXy2WTXvZMqijsoa2c41lWgCzBwdoLEuWeL02pVozva5QwCQcm3n-NGdoKL0knq6GEmq2VYWF0gUh3Ig9mFDqBImKZ4TEmN862RE_IjlqZnRpccSJzwhxxAZMSFyshvju9pe72Z8DD8XVZX80Crc1nHe3q-V96Hnspoeb-9AcDNPhnwPvRA1Yv2rrYr6I_0wG5Cq7rpSWeqsxSlYP7_3_4uPVuzQJd-uPV-8Wtx_vfWP5q2X-epv1w4X7_7uH-QCTmwXH5F-i8czVH-ztImW9xqr4kWv0jtZhh0NIQ81aV2_2PC1odqefr2K6sW3vSn8HkXo6-9QR5V8X7cy8r9nO8Jux_CvBzEepoD1ENAkObDznzrTb4cjXcGIeHbnqCCEwvggdn7P3Xj0VD5upHzmNx_DXwjrbcwcX--N-c6FEXuZrA_8uhQGOkovH5d391e07nPaSEUomXf2F0Z-AOZRcdMlxNMWCH57fzH5brue__76eX8_e_bJ-uFr80dn0iQzlfA0HYGV4RTnSjv1LXI8VRSMSX1rWbQJYV98QjuXe3109zh6WGKVzoa1_38hRumwXfs00LXxF0fAFJat2EzWiVal0qr2jSygXxFBygZIJRufV-z_GGIdEP0PpjOnSeR0onfu8_CtIqVEyxx-18X7m457qHh5gA640Cvfb44TzryXO0850GX_dDy2kKUrCnOvrxxuMkoudc0WMAyhZ-fe3njbb0Jr47upZwuxKHleleDV0WziRi__43OvZXvEUL2BDS-lwNCNKZ_j1Q4VajQ_oeP7-g59pn15ky-vjZzvj05RP0gk9g-lgfJGcjycX_dHZbjoZ9y8mfHQ-HmTji82QjSCljF_AeNOfUDo4PxPTpJ-k_WEyGST9NBn1NoM0zUaTZHR-zsbjyQAN-5BTIXs1DGfC2hKm42Q4GpxJmoG09ScyMw2nFFm5tWjYl8HlGjEnnISp51frCeN--NRlo4f_xVeys9LIqbeMbUyzFW5XZj2m88pO1YU0vroKu_XROWz4vwEAAP__ttdyfQ">