test/buildsystem/compiler_version.cmake

# SPDX-FileCopyrightText: The Eigen Authors
# SPDX-License-Identifier: MPL-2.0

cmake_minimum_required(VERSION 3.18)
include("${CMAKE_CURRENT_LIST_DIR}/../../cmake/EigenTesting.cmake")

function(check_compiler id version frontend expected)
  set(CMAKE_CXX_COMPILER_ID "${id}")
  set(CMAKE_CXX_COMPILER_VERSION "${version}")
  set(CMAKE_CXX_COMPILER_FRONTEND_VARIANT "${frontend}")
  # No driver invocation, including for missing metadata.
  set(CMAKE_CXX_COMPILER "${CMAKE_CURRENT_LIST_DIR}/compiler-must-not-be-invoked")
  ei_get_compilerver(actual)
  if(NOT actual STREQUAL expected)
    message(FATAL_ERROR "Expected ${expected}, got ${actual}")
  endif()
  if(NOT CMAKE_CXX_COMPILER_ID STREQUAL id OR NOT CMAKE_CXX_COMPILER_VERSION STREQUAL version)
    message(FATAL_ERROR "Compiler metadata was modified")
  endif()
endfunction()

check_compiler(GNU 13.3.0 GNU gnu-13.3.0)
check_compiler(Clang 18.1.3 GNU clang-18.1.3)
check_compiler(Clang 18.1.3 MSVC clang-msvc-18.1.3)
check_compiler(AppleClang 15.0.0 GNU appleclang-15.0.0)
check_compiler(MSVC 19.40.33811 MSVC msvc-19.40.33811)
check_compiler(Intel 2021.10.0 "" intel-2021.10.0)
check_compiler(IntelLLVM 2025.0.0 GNU intelllvm-2025.0.0)
check_compiler(IntelLLVM 2025.0.0 MSVC intelllvm-msvc-2025.0.0)
check_compiler(PGI 19.10 "" pgi-19.10)
check_compiler(NVHPC 25.1 "" nvhpc-25.1)
foreach(version IN ITEMS 5.4.0 8.3.0 12.2.0)
  check_compiler(QCC "${version}" "" "qcc-${version}")
endforeach()
check_compiler(CustomCompiler 1.2 "" customcompiler-1.2)
check_compiler(GNU "" "" gnu-unknown)
check_compiler("" "" "" unknown-unknown)
check_compiler("" 1.2 "" unknown-1.2)

unset(CMAKE_CXX_COMPILER_ID)
unset(CMAKE_CXX_COMPILER_VERSION)
ei_get_compilerver(actual)
if(NOT actual STREQUAL "unknown-unknown" OR DEFINED CMAKE_CXX_COMPILER_ID)
  message(FATAL_ERROR "Unset metadata was not preserved")
endif()