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function(_GFlags_import)
if(TARGET gflags)
set(GFlags_FOUND True PARENT_SCOPE)
return()
endif()
nncc_find_package(GFlagsSource QUIET)
if(GFlagsSource_FOUND)
nncc_include(ExternalProjectTools)
# build shared multi-threading gflag library
set(BUILD_SHARED_LIBS On)
set(BUILD_STATIC_LIBS Off)
set(BUILD_gflags_LIB On)
set(BUILD_gflags_nothreads_LIB Off)
add_extdirectory(${GFLAGS_SOURCE_DIR} gflags)
else(GFlagsSource_FOUND)
set(GFLAGS_ROOT_DIR "" CACHE PATH "Folder contains GFlags")
find_path(GFLAGS_INCLUDE_DIR gflags/gflags.h PATHS ${GFLAGS_ROOT_DIR})
find_library(GFLAGS_LIBRARY gflags)
if(NOT GFLAGS_INCLUDE_DIR)
set(GFlags_FOUND False PARENT_SCOPE)
return()
endif(NOT GFLAGS_INCLUDE_DIR)
add_library(gflags INTERFACE)
target_include_directories(gflags INTERFACE ${GFLAGS_INCLUDE_DIR})
target_link_libraries(gflags INTERFACE ${GFLAGS_LIBRARY})
endif(GFlagsSource_FOUND)
set(GFlags_FOUND True PARENT_SCOPE)
endfunction(_GFlags_import)
_GFlags_import()
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