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cmake: Enable policy CMP0074 for ZLIB_ROOT; deprecate PNG_BUILD_ZLIB

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Although the minimum required CMake version is 3.6, this policy will
only have effect under CMake 3.12 or newer.

Reported-by: Jacob Harding <54728054+jacobharding@users.noreply.github.com>
This commit is contained in:
Cosmin Truta 2023-12-20 19:12:42 +02:00
parent 2fff013a69
commit 85f866dea3
1 changed files with 19 additions and 2 deletions
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21
CMakeLists.txt
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@ -48,6 +48,11 @@ project(libpng
VERSION ${PNGLIB_VERSION}
LANGUAGES C ASM)
if(POLICY CMP0074)
# Allow find_package() to use the ZLIB_ROOT variable, if available.
cmake_policy(SET CMP0074 NEW)
endif()
include(CheckCSourceCompiles)
include(GNUInstallDirs)
@ -94,11 +99,23 @@ endif()
option(PNG_DEBUG "Enable debug output" OFF)
option(PNG_HARDWARE_OPTIMIZATIONS "Enable hardware optimizations" ON)
# Allow the users to specify a location of zlib.
# Useful if zlib is being built alongside this as a sub-project.
# Allow the users to specify a custom location of zlib.
# This option is deprecated, and no longer needed with CMake 3.12 and newer.
# Under the CMake policy CMP0074, if zlib is being built alongside libpng as a
# subproject, its location can be passed on to CMake via the ZLIB_ROOT variable.
option(PNG_BUILD_ZLIB "Custom zlib location, else find_package is used" OFF)
if(NOT PNG_BUILD_ZLIB)
find_package(ZLIB REQUIRED)
elseif(POLICY CMP0074)
# TODO: Remove the policy check if CMake version 3.12 or greater becomes the minimum required.
if("x${ZLIB_ROOT}" STREQUAL "x")
message(DEPRECATION
"The option PNG_BUILD_ZLIB has been deprecated; please use ZLIB_ROOT instead")
else()
message(SEND_ERROR
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} and "
"the variable ZLIB_ROOT=\"${ZLIB_ROOT}\" are mutually exclusive")
endif()
endif()
if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU AND NOT EMSCRIPTEN)