Using GoogleTest from various build systems
- Today, let’s talk about the cmake test. However, we are still talking about C + + testing. Cmake provides us with perfect testing support, for example, it has a special module ctest. Cmake native test support The cmake native support test is very simple, with only two functions: enabletesting addtest(NAME COMMAND. CONFIGURATIONS.
- Setting up CMake for Google Test. Follow the code on Github while you read. If you are new to C or CMake this can be somewhat of a daunting task on your own. However if done correctly it can save you quite a bit of heart ache in the end.
- Jul 25, 2015 Using gtest/gmock with CMake is awesome. Not so awesome is when you don’t have a pre-built gtest/gmock available to use. This article demonstrates a convenient way to add them with automated source download and have them build directly as part of your project using addsubdirectory.
GoogleTest comes with pkg-config files that can be used to determine allnecessary flags for compiling and linking to GoogleTest (and GoogleMock).Pkg-config is a standardised plain-text format containing
A sample project using GoogleTest with CMake. Contribute to kaizouman/gtest-cmake-example development by creating an account on GitHub.
- the includedir (-I) path
- necessary macro (-D) definitions
- further required flags (-pthread)
- the library (-L) path
- the library (-l) to link to
All current build systems support pkg-config in one way or another. For allexamples here we assume you want to compile the sample
samples/sample3_unittest.cc
.Cmake Find Gtest
CMake
Using
pkg-config
in CMake is fairly easy:It is generally recommended that you use
target_compile_options
+ _CFLAGS
over target_include_directories
+ _INCLUDE_DIRS
as the former includes notjust -I flags (GoogleTest might require a macro indicating to internal headersthat all libraries have been compiled with threading enabled. In addition,GoogleTest might also require -pthread
in the compiling step, and as suchsplitting the pkg-config Cflags
variable into include dirs and macros fortarget_compile_definitions()
might still miss this). The same recommendationgoes for using _LDFLAGS
over the more commonplace _LIBRARIES
, which happensto discard -L
flags and -pthread
.Help! pkg-config can’t find GoogleTest!
Let’s say you have a
CMakeLists.txt
along the lines of the one in thistutorial and you try to run cmake
. It is very possible that you get a failurealong the lines of:![Questions Questions](/uploads/1/3/7/1/137178198/456904050.png)
These failures are common if you installed GoogleTest yourself and have notsourced it from a distro or other package manager. If so, you need to tellpkg-config where it can find the
.pc
files containing the information. Say youinstalled GoogleTest to /usr/local
, then it might be that the .pc
files areinstalled under /usr/local/lib64/pkgconfig
. If you setCmake Test
pkg-config will also try to look in
PKG_CONFIG_PATH
to find gtest_main.pc
.Using pkg-config in a cross-compilation setting
Pkg-config can be used in a cross-compilation setting too. To do this, let’sassume the final prefix of the cross-compiled installation will be
/usr
, andyour sysroot is /home/MYUSER/sysroot
. Configure and install GTest usingInstall into the sysroot using
DESTDIR
:Before we continue, it is recommended to always define the following twovariables for pkg-config in a cross-compilation setting:
Cmake Gtest Example Of Data
otherwise
pkg-config
will filter -I
and -L
flags against standard prefixessuch as /usr
(see https://bugs.freedesktop.org/show_bug.cgi?id=28264#c3 forreasons why this stripping needs to occur usually).If you look at the generated pkg-config file, it will look something like
Notice that the sysroot is not included in
libdir
and includedir
! If you tryto run pkg-config
with the correctPKG_CONFIG_LIBDIR=/home/MYUSER/sysroot/usr/lib64/pkgconfig
against this .pc
file, you will get Nuget cli visual studio 2019.which is obviously wrong and points to the
CBUILD
and not CHOST
root. Inorder to use this in a cross-compilation setting, we need to tell pkg-config toinject the actual sysroot into -I
and -L
variables. Let us now tellpkg-config about the actual sysrootCmake Gtest Example Project
and running
pkg-config
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${CHOST}
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