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include (ExternalProject)
set(png_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/external/png_archive)
set(png_URL https://storage.googleapis.com/libpng-public-archive/libpng-1.2.53.tar.gz)
set(png_HASH SHA256=e05c9056d7f323088fd7824d8c6acc03a4a758c4b4916715924edc5dd3223a72)
set(png_BUILD ${CMAKE_BINARY_DIR}/png/src/png)
set(png_INSTALL ${CMAKE_BINARY_DIR}/png/install)
set(png_STATIC_LIBRARIES ${CMAKE_BINARY_DIR}/png/install/lib/libpng12.a)
set(png_HEADERS
"${png_INSTALL}/include/libpng12/png.h"
"${png_INSTALL}/include/libpng12/pngconf.h"
)
ExternalProject_Add(png
PREFIX png
URL ${png_URL}
URL_HASH ${png_HASH}
INSTALL_DIR ${png_INSTALL}
DOWNLOAD_DIR "${DOWNLOAD_LOCATION}"
CMAKE_CACHE_ARGS
-DCMAKE_BUILD_TYPE:STRING=Release
-DCMAKE_VERBOSE_MAKEFILE:BOOL=OFF
-DCMAKE_INSTALL_PREFIX:STRING=${png_INSTALL}
-DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON
)
## put png includes in the directory where they are expected
add_custom_target(png_create_destination_dir
COMMAND ${CMAKE_COMMAND} -E make_directory ${png_INCLUDE_DIR}/libpng-1.2.53
DEPENDS png)
add_custom_target(png_copy_headers_to_destination
DEPENDS png_create_destination_dir)
foreach(header_file ${png_HEADERS})
add_custom_command(TARGET png_copy_headers_to_destination PRE_BUILD
COMMAND ${CMAKE_COMMAND} -E copy ${header_file} ${png_INCLUDE_DIR}/libpng-1.2.53)
endforeach()
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