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Use system googletest dependency when available #304

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Use system googletest dependency when available #304

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3 changes: 2 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -184,7 +184,8 @@ if(BUILD_TESTING)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF) # prefer use of -std14 instead of -gnustd14

if(NOT TARGET gtest OR NOT TARGET gmock_main)
find_package(GTest REQUIRED)
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since you add REQUIRED -> if not found the cmake configure will fail where instead you would like to fallback to "build googletest if not found in the system"

if(NOT TARGET GTest::gtest OR NOT TARGET GTest::gmock_main)
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@Mizux Mizux Aug 23, 2023 •
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my 2 cents,

  1. GTest::gtest seems to be available only since CMake 3.5 (cpu_feature still use 3.0 as minimum requirement...)
    ref: https://cmake.org/cmake/help/v3.5/module/FindGTest.html
    ref: https://cmake.org/cmake/help/v3.4/module/FindGTest.html

  2. Googletest didn't provide these aliases until recently
    issue: Add CMake aliases googletest#2429
    PR: CMake: Add namespaced ALIAS library googletest#3155
    commit: google/googletest@6c5c455
    available in v1.14.0 … release-1.11.0

to compare with https://repology.org/project/gtest/badges (e.g. ubuntu 20.04 LTS => gtest 1.10.0)

  1. If your superbuild is using add_subdirectory() OR fetch_content() (without the new flag FIND_PACKAGE_ARGS NAMES ...) then you find_package() won't work as expected (i.e. ignore the call since your super already provide it)
    ref: https://cmake.org/cmake/help/latest/module/FetchContent.html#integrating-with-find-package

  2. Also in 3.24 we would be able to have FetchContent calling find_package() before sourcing if unavailable...
    ref: https://cmake.org/cmake/help/latest/module/FetchContent.html#variable:FETCHCONTENT_TRY_FIND_PACKAGE_MODE

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EDIT:

  1. DONE (we now target cmake 3.13)
  2. googletest v1.11 (June 2021) should provide alias -> Can we suppose super build use at least googletest 1.11 ?

# Download and unpack googletest at configure time.
configure_file(
cmake/googletest.CMakeLists.txt.in
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