Intel oneAPI on Windows: linker error, cannot find m.lib
Summary
Trying to build GROMACS 2024.4 with oneAPI 2025.0 + MSVC 2022 on Windows fails: LINK : fatal error LNK1181: cannot open input file ‘m.lib’
Apparently, the reason is that IntelLLVM has libm.lib, so CMake sets HAVE_LIBM to true, and so m is added to the list of libraries. However, it should be libm, not m.
Exact steps to reproduce
Get GROMACS 2024.4 (or any other?), oneAPI 2025, MSVC 2022. Follow the installation instructions from https://www.intel.com/content/www/us/en/developer/articles/training/build-gromacs-with-intel-oneapi-dpc-c-compiler.html, specifically:
cmake .. -DGMX_BUILD_OWN_FFTW=ON -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icx -DGMX_GPU=SYCL -DGMX_FFT_LIBRARY=mkl -GNinja -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=on
Possible fixes
CMake's find_library correctly stores the library path to HAVE_LIBM variable. We should use this value instead of hardcoded m.