Cross Compilation with CMake

[iloveangpao]

I am facing some issues with cross compiling my project using libserial as a dependency. I have a toolchain file:

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR aarch64)

# Specify the cross compiler locations
set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)

That I am passing to my cmake command. I include libserial using fetchcontent:

FetchContent_Declare(
    libserial
    GIT_REPOSITORY https://github.com/crayzeewulf/libserial.git
    GIT_TAG        origin/master # or a specific tag/commit
    CMAKE_ARGS     -DCMAKE_TOOLCHAIN_FILE=aarch64-linux-gnu.cmake
)
FetchContent_MakeAvailable(libserial)
set(LIBSERIAL_LIBRARIES libserial_static)
include_directories(${libserial_SOURCE_DIR}/src/libserial/ ${libserial_SOURCE_DIR}/src/)

But gtest is compiled differently from my project:

set(CMAKE_HOST_SYSTEM "Linux-5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_HOST_SYSTEM_NAME "Linux")
set(CMAKE_HOST_SYSTEM_VERSION "5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_HOST_SYSTEM_PROCESSOR "x86_64")



set(CMAKE_SYSTEM "Linux-5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_SYSTEM_NAME "Linux")
set(CMAKE_SYSTEM_VERSION "5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_SYSTEM_PROCESSOR "x86_64")

set(CMAKE_CROSSCOMPILING "FALSE")

set(CMAKE_HOST_SYSTEM "Linux-5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_HOST_SYSTEM_NAME "Linux")
set(CMAKE_HOST_SYSTEM_VERSION "5.15.133.1-microsoft-standard-WSL2")
set(CMAKE_HOST_SYSTEM_PROCESSOR "x86_64")

include("/src/aarch64-linux-gnu.cmake")

set(CMAKE_SYSTEM "Linux")
set(CMAKE_SYSTEM_NAME "Linux")
set(CMAKE_SYSTEM_VERSION "")
set(CMAKE_SYSTEM_PROCESSOR "aarch64")

set(CMAKE_CROSSCOMPILING "TRUE")