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[libpng16] build: Raise the minimum required CMake version to 3.14

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Start using the features guaranteed to be available in CMake 3.14.
Specifically, use the ability of `find_package(ZLIB)` to pick up zlib
from the ZLIB_ROOT variable (if given).

This is a cherry-pick of commit 00343a761e41e56acaeb0517aec5325d3b951837
from branch 'libpng18'.
This commit is contained in:
Cosmin Truta 2024-09-14 23:44:45 +03:00
parent d3cf9b6e22
commit 642b5d81e3
1 changed files with 11 additions and 17 deletions
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28
CMakeLists.txt
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@ -15,7 +15,7 @@
#
# SPDX-License-Identifier: libpng-2.0
cmake_minimum_required(VERSION 3.6)
cmake_minimum_required(VERSION 3.14)
set(PNGLIB_MAJOR 1)
set(PNGLIB_MINOR 6)
@ -30,11 +30,6 @@ 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)
@ -106,23 +101,22 @@ endif()
message(STATUS "Building for target architecture: ${PNG_TARGET_ARCHITECTURE}")
# Allow the users to specify a custom location of zlib.
# This option is deprecated, and no longer needed with CMake 3.12 and newer.
# Under the CMake policy CMP0074, if zlib is being built alongside libpng as a
# subproject, its location can be passed on to CMake via the ZLIB_ROOT variable.
option(PNG_BUILD_ZLIB "Custom zlib location, else find_package is used" OFF)
if(NOT PNG_BUILD_ZLIB)
find_package(ZLIB REQUIRED)
elseif(POLICY CMP0074)
# With CMake 3.12 and newer, this option is no longer necessary.
option(PNG_BUILD_ZLIB "[Deprecated; please use ZLIB_ROOT]" OFF)
if(PNG_BUILD_ZLIB)
if("x${ZLIB_ROOT}" STREQUAL "x")
message(DEPRECATION
"The option PNG_BUILD_ZLIB has been deprecated; please use ZLIB_ROOT instead")
message(SEND_ERROR
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} is no longer supported; "
"please use ZLIB_ROOT instead")
else()
message(SEND_ERROR
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} and "
"the variable ZLIB_ROOT=\"${ZLIB_ROOT}\" are mutually exclusive")
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} is no longer supported; "
"using ZLIB_ROOT=\"${ZLIB_ROOT}\"")
endif()
endif()
find_package(ZLIB REQUIRED)
if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU AND NOT EMSCRIPTEN)
find_library(M_LIBRARY m)
if(M_LIBRARY)