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Fix gtest_force_shared_crt in CMake 3.15+

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With CMake 3.15, a new mechanism was added to control which CRT
libraries link to. Because the minimum CMake version is above 3.15,
googletest can leverage it in the implementation of
gtest_force_shared_crt.

If CMAKE_MSVC_RUNTIME_LIBRARY is already defined, googletest will
respect its value rather than replace it, allowing for users to
customize the exact CRT used by googletest.
This commit is contained in:
Charles Giessen 2025-11-26 11:35:52 -06:00
parent 1b96fa13f5
commit 0b65649543
1 changed files with 12 additions and 9 deletions
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21
googletest/cmake/internal_utils.cmake
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@ -28,15 +28,6 @@ macro(fix_default_compiler_settings_)
CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
if (NOT BUILD_SHARED_LIBS AND NOT gtest_force_shared_crt)
# When Google Test is built as a shared library, it should also use
# shared runtime libraries. Otherwise, it may end up with multiple
# copies of runtime library data in different modules, resulting in
# hard-to-find crashes. When it is built as a static library, it is
# preferable to use CRT as static libraries, as we don't have to rely
# on CRT DLLs being available. CMake always defaults to using shared
# CRT libraries, so we override that default here.
string(REPLACE "/MD" "-MT" ${flag_var} "${${flag_var}}")
# When using Ninja with Clang, static builds pass -D_DLL on Windows.
# This is incorrect and should not happen, so we fix that here.
string(REPLACE "-D_DLL" "" ${flag_var} "${${flag_var}}")
@ -70,7 +61,19 @@ macro(config_compiler_and_linker)
endif()
fix_default_compiler_settings_()
if (MSVC)
# When Google Test is built as a shared library, it should also use
# shared runtime libraries. Otherwise, it may end up with multiple
# copies of runtime library data in different modules, resulting in
# hard-to-find crashes. When it is built as a static library, it is
# preferable to use CRT as static libraries, as we don't have to rely
# on CRT DLLs being available. CMake defaults to using shared
# CRT libraries, so we change that here.
if (NOT BUILD_SHARED_LIBS AND NOT gtest_force_shared_crt AND NOT DEFINED CMAKE_MSVC_RUNTIME_LIBRARY)
set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
endif()
# Newlines inside flags variables break CMake's NMake generator.
# TODO(vladl@google.com): Add -RTCs and -RTCu to debug builds.
set(cxx_base_flags "-GS -W4 -WX -wd4251 -wd4275 -nologo -J")