Minimal C++/gtest cmake project

.gitignore

build
.vscode

CMakeLists.txt

cmake_minimum_required(VERSION 3.25)
set(CMAKE_CXX_STANDARD 11)
project(c_cpp_snippet)

set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g")
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Find ccache
find_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK "${CCACHE_PROGRAM}")
endif()

## Configure testing
include(FetchContent)
set(FETCHCONTENT_QUIET TRUE)

# Download and configure googletest
FetchContent_Declare(
    gtest
    GIT_REPOSITORY https://github.com/google/googletest.git
    GIT_TAG v1.13.0
    GIT_SHALLOW ON
)
FetchContent_GetProperties(gtest)
if(NOT gtest_POPULATED)
  FetchContent_Populate(gtest)
  add_subdirectory(${gtest_SOURCE_DIR} ${CMAKE_BINARY_DIR}/_deps/gtest-build)
endif()

include_directories(${gtest_SOURCE_DIR}/googletest/include)

## Configure executables

add_executable(test main.cpp)

target_link_libraries(test PRIVATE gtest_main)

CMakeLists_linux.txt

### This CMakeLists.txt fixes Google Test builds for some Linux installations.
### First issue: The build finishes but the binary does not execute correctly:
#
#   /lib/lib64/libstdc++.so.6: version
#   `GLIBCXX_3.4.21'/`CXXABI_1.3.9'/`GLIBCXX_3.4.29'/`GLIBCXX_3.4.26'/`GLIBCXX_3.4.21'
#   not found (required by ./test)
#
# The fix is to  set the CMAKE_INSTALL_RPATH and CMAKE_BUILD_WITH_INSTALL_RPATH variables as shown below.
# Also, add stdc++ to the target_link_libraries command.
#
# The main cause is that cmake cannot find the correct libstdc++ library.
#
### Second issue: The build fails with:
#
#   undefined reference to symbol nextafter@@GLIBC_2.2.5
#   error adding symbols: DSO missing from command line
#
# The fix is to  add m to the target_link_libraries command.
# The main cause is that m should be configured explicitly.

cmake_minimum_required(VERSION 3.25)
set(CMAKE_CXX_COMPILER "/path/to/gcc/version/bin/gcc")
set(CMAKE_INSTALL_RPATH "/path/to/gcc/version/lib64")
set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
set(CMAKE_CXX_STANDARD 11)
project(c_cpp_snippet)

set(CMAKE_BUILD_TYPE Debug)
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g")
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Find ccache
find_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK "${CCACHE_PROGRAM}")
endif()

## Configure testing
include(FetchContent)
set(FETCHCONTENT_QUIET TRUE)

# Download and configure googletest
FetchContent_Declare(
    gtest
    GIT_REPOSITORY https://github.com/google/googletest.git
    GIT_TAG v1.13.0
    GIT_SHALLOW ON
)
FetchContent_GetProperties(gtest)
if(NOT gtest_POPULATED)
  FetchContent_Populate(gtest)
  add_subdirectory(${gtest_SOURCE_DIR} ${CMAKE_BINARY_DIR}/_deps/gtest-build)
endif()

include_directories(${gtest_SOURCE_DIR}/googletest/include)

## Configure executables

add_executable(test main.cpp)

target_link_libraries(test PRIVATE stdc++ gtest gmock m)

main.cpp

#include <gtest/gtest.h>

int sum (int a, int b)
{
    return a + b;
}

TEST(SumTest, PositiveNumbers)
{
    EXPECT_EQ(2, sum(1, 1));
    EXPECT_EQ(5, sum(2, 3));
    EXPECT_EQ(10, sum(5, 5));
}

int main(int argc, char** argv)
{
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}