WillAyd opened a new issue, #45325:
URL: https://github.com/apache/arrow/issues/45325
### Describe the bug, including details regarding any error messages,
version, and platform.
If you add `-DCMAKE_CXX_COMPILER=clang++` you get a rather confusing error
message about the threads library not being found:
```bash
$ cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug
-DCMAKE_EXPORT_COMPILE_COMMANDS=ON -G Ninja -DARROW_COMPUTE=ON
-DARROW_BUILD_TESTS=ON -DCMAKE_CXX_COMPILER=clang++
CMake Error at
/usr/share/cmake-3.28/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find Threads (missing: Threads_FOUND)
Call Stack (most recent call first):
/usr/share/cmake-3.28/Modules/FindPackageHandleStandardArgs.cmake:600
(_FPHSA_FAILURE_MESSAGE)
/usr/share/cmake-3.28/Modules/FindThreads.cmake:226
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)
cmake_modules/ThirdpartyToolchain.cmake:1050 (find_package)
CMakeLists.txt:546 (include)
```
If you look at the CMake configuration log, you will see that the error
actually doesn't have anything to do with thread support, but rather with the C
compiler (in my case gcc) being provided arguments that only work with clang:
```yaml
---
events:
kind: "try_compile-v1"
backtrace:
-
"/usr/share/cmake-3.28/Modules/Internal/CheckSourceCompiles.cmake:101
(try_compile)"
- "/usr/share/cmake-3.28/Modules/CheckCSourceCompiles.cmake:52
(cmake_check_source_compiles)"
- "/usr/share/cmake-3.28/Modules/FindThreads.cmake:97
(CHECK_C_SOURCE_COMPILES)"
- "/usr/share/cmake-3.28/Modules/FindThreads.cmake:163
(_threads_check_libc)"
- "cmake_modules/ThirdpartyToolchain.cmake:1050 (find_package)"
- "CMakeLists.txt:546 (include)"
checks:
- "Performing Test CMAKE_HAVE_LIBC_PTHREAD"
directories:
source:
"/home/willayd/clones/arrow/cpp/build/CMakeFiles/CMakeScratch/TryCompile-C4sSBS"
binary:
"/home/willayd/clones/arrow/cpp/build/CMakeFiles/CMakeScratch/TryCompile-C4sSBS"
cmakeVariables:
CMAKE_CXX_COMPILER_CLANG_SCAN_DEPS: "/usr/bin/clang-scan-deps-18"
CMAKE_C_FLAGS: "-O0 -O0 -Qunused-arguments"
CMAKE_C_FLAGS_DEBUG: "-g -Werror -O0 -ggdb "
CMAKE_EXE_LINKER_FLAGS: ""
CMAKE_MODULE_PATH: "/home/willayd/clones/arrow/cpp/cmake_modules"
CMAKE_POSITION_INDEPENDENT_CODE: "ON"
buildResult:
variable: "CMAKE_HAVE_LIBC_PTHREAD"
cached: true
stdout: |
Change Dir:
'/home/willayd/clones/arrow/cpp/build/CMakeFiles/CMakeScratch/TryCompile-C4sSBS'
Run Build Command(s): /usr/bin/ninja -v cmTC_500bc
[1/2] /usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -O0 -O0
-Qunused-arguments -std=gnu11 -fPIE -o CMakeFiles/cmTC_500bc.dir/src.c.o -c
/home/willayd/clones/arrow/cpp/build/CMakeFiles/CMakeScratch/TryCompile-C4sSBS/src.c
FAILED: CMakeFiles/cmTC_500bc.dir/src.c.o
/usr/bin/cc -DCMAKE_HAVE_LIBC_PTHREAD -O0 -O0 -Qunused-arguments
-std=gnu11 -fPIE -o CMakeFiles/cmTC_500bc.dir/src.c.o -c
/home/willayd/clones/arrow/cpp/build/CMakeFiles/CMakeScratch/TryCompile-C4sSBS/src.c
cc: error: unrecognized command-line option ‘-Qunused-arguments’
ninja: build stopped: subcommand failed.
exitCode: 1
```
### Component(s)
C++
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