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Description
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Problem description
Running CMake find_package(pybind11) on Windows + Intel new ICX compiler (a.k.a. IntelLLVM) gives:
-- Performing Test HAS_INTEL_IPO
-- Performing Test HAS_INTEL_IPO - Failed
From the CMakeError.log file:
clang-cl: warning: unknown argument ignored in clang-cl '-ipo'; did you mean '-Qipo'? [-Wunknown-argument]
Indeed, pybind11Common.cmake doesn't seem to handle the ICX compiler correctly and misinterpret its CMAKE_CXX_COMPILER_ID (being IntelLLVM for new ICX) for the Intel Classic compiler (being Intel for old ICC/ICL).
I believe the ICX compiler expects -ipo on UNIX but -Qipo on WIN32.
Reproducible example code
cmake_minimum_required(
VERSION 3.23.0)
set(CMAKE_C_COMPILER "icx")
set(CMAKE_CXX_COMPILER "icx")
enable_language(C CXX)
project(CMake-IntelLLVM-WIN32)
find_package(pybind11 CONFIG)
add_executable(cmake-intelllvm-win32 main.cpp)
Ran like:
cmake -G Ninja -B build\ -Dpybind11_ROOT:PATH=[...] .
Gives:
-- The C compiler identification is IntelLLVM 2022.1.0 with MSVC-like command-line
-- The CXX compiler identification is IntelLLVM 2022.1.0 with MSVC-like command-line
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: C:/Program Files (x86)/Intel/oneAPI/compiler/latest/windows/bin/icx.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: C:/Program Files (x86)/Intel/oneAPI/compiler/latest/windows/bin/icx.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonInterp: C:/apps/Python310/python.exe (found version "3.10.4")
-- Found PythonLibs: C:/apps/Python310/libs/python310.lib
-- Performing Test HAS_INTEL_IPO
-- Performing Test HAS_INTEL_IPO - Failed
-- Found pybind11: D:/... (found version "2.9.2")
-- Configuring done
-- Generating done
-- Build files have been written to: D:/...