google test cross compile minimal setup with cmake

gtest.sh

cat > main.cpp <<- EOM
#include <gtest/gtest.h>

TEST(group, name)
{
  printf("Hello!\n");
}
EOM

cat > CMakeLists.txt <<- EOM
cmake_minimum_required(VERSION 3.14)
project(isa_gtests)
include(FetchContent)
FetchContent_Declare(googletest URL https://github.com/google/googletest/archive/refs/tags/v1.13.0.zip)
FetchContent_MakeAvailable(googletest)
enable_testing()
add_executable(tests main.cpp)
target_link_libraries(tests gtest_main)
include(GoogleTest)
gtest_discover_tests(tests)
EOM

cat > toolchain.txt <<- EOM
set(TOOLCHAIN_PATH "")
set(CMAKE_CXX_COMPILER              ${TOOLCHAIN_PATH}g++${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_LINKER                    ${TOOLCHAIN_PATH}ld${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_CXX_FLAGS                "-O2")
set(CMAKE_CROSSCOMPILING_EMULATOR   "${TOOLCHAIN_PATH}qemu")
EOM

cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=toolchain.txt
cmake --build build