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GH-34813: [C++] Improve GoogleTest detection #34920
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| # Licensed to the Apache Software Foundation (ASF) under one | ||
| # or more contributor license agreements. See the NOTICE file | ||
| # distributed with this work for additional information | ||
| # regarding copyright ownership. The ASF licenses this file | ||
| # to you under the Apache License, Version 2.0 (the | ||
| # "License"); you may not use this file except in compliance | ||
| # with the License. You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, | ||
| # software distributed under the License is distributed on an | ||
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| # KIND, either express or implied. See the License for the | ||
| # specific language governing permissions and limitations | ||
| # under the License. | ||
|
|
||
| if(GTestAlt_FOUND) | ||
| return() | ||
| endif() | ||
|
|
||
| set(find_package_args) | ||
| if(GTestAlt_FIND_VERSION) | ||
| list(APPEND find_package_args ${GTestAlt_FIND_VERSION}) | ||
| endif() | ||
| if(GTestAlt_FIND_QUIETLY) | ||
| list(APPEND find_package_args QUIET) | ||
| endif() | ||
| if(CMAKE_VERSION VERSION_LESS 3.23) | ||
| list(APPEND find_package_args CONFIG) | ||
| endif() | ||
| # We can't find shred library version of GoogleTest on Windows with | ||
| # Conda's gtest package because it doesn't provide GTestConfig.cmake | ||
| # provided by GoogleTest and CMake's built-in FindGTtest.cmake | ||
| # doesn't support gtest_dll.dll. | ||
| find_package(GTest ${find_package_args}) | ||
|
|
||
| set(GTestAlt_FOUND ${GTest_FOUND}) | ||
| if(GTestAlt_FOUND) | ||
| set(KEEP_CMAKE_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE}) | ||
| set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE) | ||
| set(GTestAlt_CXX_STANDARD_TEST_SOURCE | ||
| "${CMAKE_CURRENT_BINARY_DIR}/gtest_cxx_standard_test.cc") | ||
| file(WRITE ${GTestAlt_CXX_STANDARD_TEST_SOURCE} | ||
| " | ||
| #include <string_view> | ||
| #include <gtest/gtest.h> | ||
|
|
||
| TEST(CXX_STANDARD, MatcherStringView) { | ||
| testing::Matcher matcher(std::string_view(\"hello\")); | ||
| } | ||
| ") | ||
| try_compile(GTestAlt_CXX_STANDARD_AVAILABLE ${CMAKE_CURRENT_BINARY_DIR} | ||
| SOURCES ${GTestAlt_CXX_STANDARD_TEST_SOURCE} | ||
| LINK_LIBRARIES GTest::gtest_main) | ||
| set(CMAKE_TRY_COMPILE_TARGET_TYPE ${KEEP_CMAKE_TRY_COMPILE_TARGET_TYPE}) | ||
| if(NOT GTestAlt_CXX_STANDARD_AVAILABLE) | ||
| message(STATUS "GTest can't be used with ${CMAKE_CXX_STANDARD}") | ||
| set(GTestAlt_FOUND FALSE) | ||
| endif() | ||
| endif() |
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IMHO this is a regression as using variables instead of targets is an anti-pattern but I currently don't see a cleaner approach either.
I think we should rethink the entire dependency management once we have bumped the cmake version to 3.16 as we will have much better tools available. (this is of course out of scope for this PR)
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We can use
add_library(ALIAS)with CMake 3.11: https://cmake.org/cmake/help/latest/command/add_library.html#alias-libraries