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if (NOT __GFLAGS_INCLUDED) # guard against multiple includes
set(__GFLAGS_INCLUDED TRUE)
# use the system-wide gflags if present
find_package(GFlags)
if (GFLAGS_FOUND)
set(GFLAGS_EXTERNAL FALSE)
else()
# gflags will use pthreads if it's available in the system, so we must link with it
find_package(Threads)
# build directory
set(gflags_PREFIX ${CMAKE_BINARY_DIR}/external/gflags-prefix)
# install directory
set(gflags_INSTALL ${CMAKE_BINARY_DIR}/external/gflags-install)
# we build gflags statically, but want to link it into the caffe shared library
# this requires position-independent code
if (UNIX)
set(GFLAGS_EXTRA_COMPILER_FLAGS "-fPIC")
endif()
set(GFLAGS_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${GFLAGS_EXTRA_COMPILER_FLAGS})
set(GFLAGS_C_FLAGS ${CMAKE_C_FLAGS} ${GFLAGS_EXTRA_COMPILER_FLAGS})
ExternalProject_Add(gflags
PREFIX ${gflags_PREFIX}
GIT_REPOSITORY "https://github.com/gflags/gflags.git"
GIT_TAG "v2.1.2"
UPDATE_COMMAND ""
INSTALL_DIR ${gflags_INSTALL}
CMAKE_ARGS -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-DCMAKE_INSTALL_PREFIX=${gflags_INSTALL}
-DBUILD_SHARED_LIBS=OFF
-DBUILD_STATIC_LIBS=ON
-DBUILD_PACKAGING=OFF
-DBUILD_TESTING=OFF
-DBUILD_NC_TESTS=OFF
-BUILD_CONFIG_TESTS=OFF
-DINSTALL_HEADERS=ON
-DCMAKE_C_FLAGS=${GFLAGS_C_FLAGS}
-DCMAKE_CXX_FLAGS=${GFLAGS_CXX_FLAGS}
LOG_DOWNLOAD 1
LOG_INSTALL 1
)
set(GFLAGS_FOUND TRUE)
set(GFLAGS_INCLUDE_DIRS ${gflags_INSTALL}/include)
set(GFLAGS_LIBRARIES ${gflags_INSTALL}/lib/libgflags.a ${CMAKE_THREAD_LIBS_INIT})
set(GFLAGS_LIBRARY_DIRS ${gflags_INSTALL}/lib)
set(GFLAGS_EXTERNAL TRUE)
list(APPEND external_project_dependencies gflags)
endif()
endif()
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