What is the idiomatic way in CMAKE to add the -fPIC compiler option?

Question

I\'ve come across at least 3 ways to do this and I\'m wondering which is the idiomatic way. This needs to be done almost universally to any static library. I\'m surprised

Answer 1

If this is not your cmake project and you can't or don't want to modify the project files you can also pass the following command line option to cmake:

-DCMAKE_POSITION_INDEPENDENT_CODE=ON

Answer 2

You can set the position independent code property on all targets:

set(CMAKE_POSITION_INDEPENDENT_CODE ON)

or in a specific library:

add_library(lib1 lib1.cpp)
set_property(TARGET lib1 PROPERTY POSITION_INDEPENDENT_CODE ON)

Reference: CMAKE_POSITION_INDEPENDENT_CODE cmake build system