forked from OSchip/llvm-project
68 lines
2.4 KiB
CMake
68 lines
2.4 KiB
CMake
#
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#//===----------------------------------------------------------------------===//
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#//
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#// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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#// See https://llvm.org/LICENSE.txt for license information.
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#// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#//
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#//===----------------------------------------------------------------------===//
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#
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# Checking a linker flag to build a shared library
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# There is no real trivial way to do this in CMake, so we implement it here
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# this will have ${boolean} = TRUE if the flag succeeds, otherwise FALSE.
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function(libomp_check_linker_flag flag boolean)
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if(NOT DEFINED "${boolean}")
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set(retval TRUE)
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set(library_source
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"int foo(int a) { return a*a; }")
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set(cmake_source
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"cmake_minimum_required(VERSION 2.8)
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project(foo C)
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set(CMAKE_SHARED_LINKER_FLAGS \"${flag}\")
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add_library(foo SHARED src_to_link.c)")
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set(failed_regexes "[Ee]rror;[Uu]nknown;[Ss]kipping;LINK : warning")
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set(base_dir ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/link_flag_check_${boolean})
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file(MAKE_DIRECTORY ${base_dir})
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file(MAKE_DIRECTORY ${base_dir}/build)
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file(WRITE ${base_dir}/src_to_link.c "${library_source}")
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file(WRITE ${base_dir}/CMakeLists.txt "${cmake_source}")
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message(STATUS "Performing Test ${boolean}")
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try_compile(
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try_compile_result
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${base_dir}/build
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${base_dir}
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foo
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OUTPUT_VARIABLE OUTPUT)
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if(try_compile_result)
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foreach(regex IN LISTS failed_regexes)
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if("${OUTPUT}" MATCHES ${regex})
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set(retval FALSE)
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endif()
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endforeach()
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else()
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set(retval FALSE)
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endif()
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if(${retval})
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set(${boolean} 1 CACHE INTERNAL "Test ${boolean}")
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message(STATUS "Performing Test ${boolean} - Success")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Performing C Linker Flag test ${boolean} succeeded with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${library_source}\n")
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else()
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set(${boolean} "" CACHE INTERNAL "Test ${boolean}")
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message(STATUS "Performing Test ${boolean} - Failed")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Performing C Linker Flag test ${boolean} failed with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${library_source}\n")
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endif()
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set(${boolean} ${retval} PARENT_SCOPE)
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endif()
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endfunction()
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