CMAKe library level CFLAGS

Question

I have project of following struct

 A 
   CMakeLists.txt
 B 
   CMakeLists.txt
 C
   CMakeLists.txt

I directory level CFLAGS .

so what CFLAGS A uses to compile will be only used for A only.

How can I set directory level or (sub project level ) CFLAGS using cmake

Answer 1

You can do following:

set_source_files_properties(file1.c file2.c
    PROPERTIES COMPILE_FLAGS ${YOUR_CFLAGS_HERE}
)

Still, it's recommended to use add_definitions(), include_directories(), link_directories() and so on.

if any of these functions will be called in A/CMakeLists.txt, they will not have any effect on {B,C}/CMakeLists.txt.