mirror of
https://github.com/glennrp/libpng.git
synced 2025-08-07 13:22:57 +03:00
23bdc7a6c4
Running the pnglibconf scripts (script/*.awk) is not always possible. An AWK interpreter is not always guaranteed to be available; and even if it is, there are limitations when making cross-platform libpng builds, especially when the differences between the host platform and the target platform are significant. For example: * Building for the Windows (MinGW) target on a Unix development host; * Building for the iOS target on a macOS development host; * Building for the Android target on any development host. In such scenarios, a preconfigured (i.e. prebuilt) pnglibconf.h file, either taken from the libpng source tree or provided by the user who wants to make a custom libpng build, becomes a necessity. In this commit we introduce the build option `PNG_LIBCONF_HEADER` in order to address this specific use case. We also specify a version range (3.14...4.0) for the minimum required CMake program, to future-proof the CMake build for just a little bit longer. Signed-off-by: Cosmin Truta <ctruta@gmail.com>
46 lines
1.5 KiB
CMake
46 lines
1.5 KiB
CMake
# PNGConfig.cmake
|
|
# Utility functions for configuring and building libpng
|
|
|
|
# Copyright (c) 2025 Cosmin Truta
|
|
#
|
|
# Use, modification and distribution are subject to
|
|
# the same licensing terms and conditions as libpng.
|
|
# Please see the copyright notice in png.h or visit
|
|
# http://libpng.org/pub/png/src/libpng-LICENSE.txt
|
|
#
|
|
# SPDX-License-Identifier: libpng-2.0
|
|
|
|
# Check libconf file (pnglibconf.h.* or *.dfa):
|
|
# png_check_libconf([HEADER <file>] [DFA_XTRA <file>])
|
|
function(png_check_libconf)
|
|
set(options)
|
|
set(oneValueArgs HEADER DFA_XTRA)
|
|
set(multiValueArgs)
|
|
|
|
cmake_parse_arguments(_CHK "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
|
|
|
|
if(_CHK_HEADER AND _CHK_DFA_XTRA)
|
|
message(FATAL_ERROR "png_check_libconf: Mutually-exclusive arguments: HEADER and DFA_XTRA")
|
|
endif()
|
|
|
|
if(_CHK_HEADER)
|
|
if(EXISTS "${_CHK_HEADER}")
|
|
if("x${_CHK_HEADER}" STREQUAL "x${PNG_LIBCONF_HEADER_PREBUILT}")
|
|
message(STATUS "Using standard libconf header: ${_CHK_HEADER}")
|
|
else()
|
|
message(STATUS "Using custom libconf header: ${_CHK_HEADER}")
|
|
endif()
|
|
else()
|
|
message(SEND_ERROR "Could not find libconf header: ${_CHK_HEADER}")
|
|
endif()
|
|
else()
|
|
if("x${_CHK_DFA_XTRA}" STREQUAL "x")
|
|
message(STATUS "Creating standard configuration")
|
|
elseif(EXISTS "${_CHK_DFA_XTRA}")
|
|
message(STATUS "Creating custom configuration with DFA_XTRA file: ${_CHK_DFA_XTRA}")
|
|
else()
|
|
message(SEND_ERROR "Could not find DFA_XTRA file: ${_CHK_DFA_XTRA}")
|
|
endif()
|
|
endif()
|
|
endfunction()
|