c-resources/CPlusPlus20ForProgrammers-m.../examples/libraries/GSL/include/CMakeLists.txt

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CMake

# Add include folders to the library and targets that consume it
# the SYSTEM keyword suppresses warnings for users of the library
#
# By adding this directory as an include directory the user gets a
# namespace effect.
#
# IE:
# #include <gsl/gsl>
if(GSL_STANDALONE_PROJECT)
target_include_directories(GSL INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
else()
target_include_directories(GSL SYSTEM INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
endif()