Disable compiler flag for external dependencies

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Hello,

I am trying to compile my c++ source files with certain gcc compiler flags (namely -Wall), but not external libs. But I can’t figure out how to achieve this. I have this mock setup for my cmakelists project file:

cmake_minimum_required(VERSION 3.11)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_BUILD_TYPE "Release")

project(test)

add_subdirectory(extern/libs/efg)

include_directories("extern/libs/xyz")

add_executable(binary my_source_file1.cpp
			my_source_file2.cpp
			my_source_file3.cpp
			my_source_file4.cpp
)

target_compile_options(binary PRIVATE
				-Wall)

target_link_libraries(binary efg)

However when I build the project, it also gives compiler flag warnings for the external libs I have included. How would I avoid this? I just want to get warnings for my own source files, and not any other external dependencies. I am quite novice to cmake, so not sure how to achieve this

Thanks

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