GoogleTest compile with MT_StaticRelease errors - c++

Question

How can I force google test compile with /MT option?
I saw that google test tries to compile with MT(internal_utils.cmake line 33):
if (NOT BUILD_SHARED_LIBS AND NOT gtest_force_shared_crt)
string(REPLACE "/MD" "-MT" ${flag_var} "${${flag_var}}")
endif()
But it doesn't work (BUILD_SHARED_LIBS and gtest_force_shared_crt are disabled).
I gets error when my project compiles with MT:
gtest.lib(gtest-all.obj) : error LNK2038: mismatch detected for
"RuntimeLibrary": value "MD_DynamicRelease" does not match value
"MT_StaticRelease"
And more some LNK2005 and LNK4217.
If I try to compile my project without MT, all compiles ok.
How can I solve it? Thanks in advance!

Answer 1

That if is a test, implementing a switch allowing you to configure it before including googletest.
It's also mentioned in the manual:
Visual Studio Dynamic vs Static Runtimes
By default, new Visual Studio projects link the C runtimes dynamically
but GoogleTest links them statically. This will generate an error that
looks something like the following: gtest.lib(gtest-all.obj) : error
LNK2038: mismatch detected for 'RuntimeLibrary': value
'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in main.obj
GoogleTest already has a CMake option for this: gtest_force_shared_crt
Enabling this option will make gtest link the runtimes dynamically
too, and match the project in which it is included.
So just set it in your project e.g. like this:
set(gtest_force_shared_crt on)
include(FetchContent)
FetchContent_Declare(googletest
GIT_REPOSITORY https://github.com/google/googletest.git
GIT_TAG main)
FetchContent_MakeAvailable(googletest)
enable_testing()