CMakeLists.txt

include(ExternalProject)

set(INSTALL_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../install)
set(ARCHIVE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../archives)

if (MSVC)
  set(
    BZIP_LIBRARIES
    ${INSTALL_DIR}/lib/libbz2.lib
  )
  ExternalProject_Add(bzip2-
    PREFIX ${CMAKE_CURRENT_BINARY_DIR}
    DOWNLOAD_DIR ${ARCHIVE_DIR}
    URL https://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz
    URL_HASH SHA256=ab5a03176ee106d3f0fa90e381da478ddae405918153cca248e682cd0c4a2269
    BUILD_BYPRODUCTS ${BZIP_LIBRARIES}
    BUILD_IN_SOURCE 1
    CONFIGURE_COMMAND nmake -f makefile.msc
    BUILD_COMMAND cp bzlib.h ${INSTALL_DIR}/include
    INSTALL_COMMAND cp libbz2.* ${INSTALL_DIR}/lib
    DOWNLOAD_NO_PROGRESS ON
    LOG_DOWNLOAD ON
    LOG_UPDATE ON
    LOG_CONFIGURE ON
    LOG_BUILD ON
    LOG_INSTALL ON
    LOG_MERGED_STDOUTERR ON
    LOG_OUTPUT_ON_FAILURE ON
  )
else()
  set(
    BZIP_LIBRARIES
    ${INSTALL_DIR}/lib/libbz2.a
  )
  ExternalProject_Add(bzip2-
    PREFIX ${CMAKE_CURRENT_BINARY_DIR}
    DOWNLOAD_DIR ${ARCHIVE_DIR}
    URL https://sourceware.org/pub/bzip2/bzip2-1.0.8.tar.gz
    URL_HASH SHA256=ab5a03176ee106d3f0fa90e381da478ddae405918153cca248e682cd0c4a2269
    BUILD_BYPRODUCTS ${BZIP_LIBRARIES}
    BUILD_IN_SOURCE 1
    CONFIGURE_COMMAND ""
    BUILD_COMMAND make VERBOSE=1 "CFLAGS=-fPIC -fvisibility=hidden -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64"
    INSTALL_COMMAND make install PREFIX=${INSTALL_DIR}
    DOWNLOAD_NO_PROGRESS ON
    LOG_DOWNLOAD ON
    LOG_UPDATE ON
    LOG_CONFIGURE ON
    LOG_BUILD ON
    LOG_INSTALL ON
    LOG_MERGED_STDOUTERR ON
    LOG_OUTPUT_ON_FAILURE ON
  )
endif(MSVC)

add_library(bzip2 INTERFACE)
add_dependencies(bzip2 bzip2-)
target_include_directories(bzip2 INTERFACE ${INSTALL_DIR}/include)
target_link_libraries(bzip2 INTERFACE ${BZIP_LIBRARIES})