cmake include_directories for boost

Question

I'm adopting cmake script for a windows build, and faced with an issue which was not occured under *nix

set(BOOST_ROOT, "C:/dev/tools/boost_1_60_0")
include_directories(${INCLUDE_DIRECTORIES} ${BOOST_ROOT} include)

It doesn't work - during the compilation , vc can't find boost headers.

include_directories(${INCLUDE_DIRECTORIES} "C:/dev/tools/boost_1_60_0" include)

this works well.

any ideas why it happens?

just for sure, for this configuration pre-compiled libraries are not required so then I don't perform find_package, just using a headers

Answer 1

if it's not a typo, the "," is not needed in the set directive :

set(BOOST_ROOT "C:/dev/tools/boost_1_60_0")

this should work as expected.

Answer 2

Why not FindBoost() ?

find_package(Boost 1.60 REQUIRED)
include_directories(${Boost_INCLUDE_DIRS})