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

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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

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