CMAKE_MINIMUM_REQUIRED(VERSION 3.1)
PROJECT(Snappy VERSION 1.1.6 LANGUAGES C CXX)

SET(CMAKE_INCLUDE_CURRENT_DIR ON)

INCLUDE(CheckIncludeFiles)
INCLUDE(CheckLibraryExists)
INCLUDE(CheckCXXSourceCompiles)
INCLUDE(CheckSymbolExists)
INCLUDE(TestBigEndian)
INCLUDE(CMakePackageConfigHelpers)

TEST_BIG_ENDIAN(WORDS_BIG_ENDIAN)
IF (WORDS_BIG_ENDIAN)
    MESSAGE(STATUS "Building on big endian system")
    ADD_DEFINITIONS(-DWORDS_BIGENDIAN=1)
ENDIF (WORDS_BIG_ENDIAN)

CHECK_INCLUDE_FILES("byteswap.h" HAVE_BYTESWAP_H)
CHECK_INCLUDE_FILES("stddef.h" HAVE_STDDEF_H)
CHECK_INCLUDE_FILES("stdint.h" HAVE_STDINT_H)
CHECK_INCLUDE_FILES("sys/endian.h" HAVE_SYS_ENDIAN_H)
CHECK_INCLUDE_FILES("sys/mman.h" HAVE_SYS_MMAN_H)
CHECK_INCLUDE_FILES("sys/resource.h" HAVE_SYS_RESOURCE_H)
CHECK_INCLUDE_FILES("sys/time.h" HAVE_SYS_TIME_H)
CHECK_INCLUDE_FILES("sys/uio.h" HAVE_SYS_UIO_H)
CHECK_INCLUDE_FILES("windows.h" HAVE_WINDOWS_H)

IF (NOT HAVE_SYS_UIO_H)
    SET(HAVE_SYS_UIO_H 0)
ENDIF (NOT HAVE_SYS_UIO_H)

IF (NOT HAVE_STDINT_H)
    SET(HAVE_STDINT_H 0)
ENDIF (NOT HAVE_STDINT_H)

IF (NOT HAVE_STDDEF_H)
    SET(HAVE_STDDEF_H 0)
ENDIF (NOT HAVE_STDDEF_H)

CHECK_LIBRARY_EXISTS(z zlibVersion "" HAVE_LIBZ)
CHECK_LIBRARY_EXISTS(lzo2 lzo1x_1_15_compress "" HAVE_LIBLZO2)

CHECK_SYMBOL_EXISTS(mmap sys/mman.h HAVE_FUNC_MMAP)

CHECK_CXX_SOURCE_COMPILES("int main(void) { return __builtin_expect(0, 1); }"
        HAVE_BUILTIN_EXPECT)

CHECK_CXX_SOURCE_COMPILES("int main(void) { return __builtin_ctzll(0); }"
        HAVE_BUILTIN_CTZ)

FIND_PACKAGE(GTest QUIET)
IF(GTEST_FOUND)
    SET(HAVE_GTEST 1)
ENDIF()

FIND_PACKAGE(Gflags QUIET)
IF(GFLAGS_FOUND)
    SET(HAVE_GFLAGS 1)
ENDIF()

CONFIGURE_FILE(${Snappy_SOURCE_DIR}/cmake/config.h.in config.h)

# Configure snappy-stubs-public.h.in
SET(ac_cv_have_stdint_h ${HAVE_STDINT_H})
SET(ac_cv_have_stddef_h ${HAVE_STDDEF_H})
SET(ac_cv_have_sys_uio_h ${HAVE_SYS_UIO_H})
CONFIGURE_FILE(${Snappy_SOURCE_DIR}/snappy-stubs-public.h.in
               snappy-stubs-public.h)

IF (WIN32)
    ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS)
ENDIF (WIN32)

# Define the main library.
ADD_LIBRARY(snappy SHARED
        snappy-c.cc
        snappy-c.h
        snappy-sinksource.cc
        snappy-sinksource.h
        snappy-stubs-internal.cc
        snappy-stubs-public.h
        snappy.cc
        snappy.h)

TARGET_COMPILE_DEFINITIONS(snappy PRIVATE -DHAVE_CONFIG_H)

SET_TARGET_PROPERTIES(snappy PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS ON)

INSTALL(FILES snappy.h
        snappy-c.h
        snappy-sinksource.h
        ${Snappy_BINARY_DIR}/snappy-stubs-public.h
        DESTINATION include)

INSTALL(TARGETS snappy
        EXPORT SnappyTargets
        RUNTIME DESTINATION bin
        LIBRARY DESTINATION lib
        ARCHIVE DESTINATION lib)
INSTALL(EXPORT SnappyTargets NAMESPACE Snappy:: DESTINATION lib/cmake/Snappy)

SET_TARGET_PROPERTIES(snappy PROPERTIES VERSION ${PROJECT_VERSION}
                      SOVERSION ${PROJECT_VERSION_MAJOR})

SET(INCLUDE_INSTALL_DIR include)
SET(LIBRARY_INSTALL_DIR lib)
SET(BINARY_INSTALL_DIR bin)

CONFIGURE_PACKAGE_CONFIG_FILE(cmake/SnappyConfig.cmake.in
        ${Snappy_BINARY_DIR}/SnappyConfig.cmake
        INSTALL_DESTINATION lib/Snappy/cmake
        PATH_VARS INCLUDE_INSTALL_DIR LIBRARY_INSTALL_DIR BINARY_INSTALL_DIR
        )

WRITE_BASIC_PACKAGE_VERSION_FILE(${Snappy_BINARY_DIR}/SnappyConfigVersion.cmake
        COMPATIBILITY SameMajorVersion)
INSTALL(FILES ${Snappy_BINARY_DIR}/SnappyConfig.cmake
        ${Snappy_BINARY_DIR}/SnappyConfigVersion.cmake
        DESTINATION lib/cmake)

ENABLE_TESTING()

IF (HAVE_LIBZ)
    LIST(APPEND COMPRESSION_LIBS z)
ENDIF (HAVE_LIBZ)

IF (HAVE_LIBLZO2)
    LIST(APPEND COMPRESSION_LIBS lzo2)
ENDIF (HAVE_LIBLZO2)

ADD_EXECUTABLE(snappy-unittest snappy_unittest.cc snappy-test.cc)
TARGET_COMPILE_DEFINITIONS(snappy-unittest PRIVATE -DHAVE_CONFIG_H)
TARGET_LINK_LIBRARIES(snappy-unittest snappy ${COMPRESSION_LIBS}
                      ${GFLAGS_LIBRARIES})
TARGET_INCLUDE_DIRECTORIES(snappy-unittest BEFORE PRIVATE ${Snappy_SOURCE_DIR}
                           ${GTEST_INCLUDE_DIRS} ${GFLAGS_INCLUDE_DIRS})

ADD_TEST(NAME snappy-unittest
         WORKING_DIRECTORY ${Snappy_SOURCE_DIR}
         COMMAND ${Snappy_BINARY_DIR}/snappy-unittest)