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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
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)
if(WIN32)
set(png_STATIC_LIBRARIES
debug ${CMAKE_BINARY_DIR}/png/install/lib/libpng12_staticd.lib
optimized ${CMAKE_BINARY_DIR}/png/install/lib/libpng12_static.lib)
else()
set(png_STATIC_LIBRARIES ${CMAKE_BINARY_DIR}/png/install/lib/libpng12.a)
endif()
set(png_HEADERS
"${png_INSTALL}/include/libpng12/png.h"
"${png_INSTALL}/include/libpng12/pngconf.h"
)
ExternalProject_Add(png
PREFIX png
DEPENDS zlib
URL ${png_URL}
URL_HASH ${png_HASH}
INSTALL_DIR ${png_INSTALL}
DOWNLOAD_DIR "${DOWNLOAD_LOCATION}"
CMAKE_CACHE_ARGS
if(tensorflow_ENABLE_POSITION_INDEPENDENT_CODE)
-DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON
else()
-DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=OFF
endif()
-DCMAKE_BUILD_TYPE:STRING=Release
-DCMAKE_VERBOSE_MAKEFILE:BOOL=OFF
-DCMAKE_INSTALL_PREFIX:STRING=${png_INSTALL}
-DZLIB_ROOT:STRING=${ZLIB_INSTALL}
)
## 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}
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_if_different ${header_file} ${png_INCLUDE_DIR}/)
endforeach()
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