vcpkg/ports/libpng/portfile.cmake
alcroito c5f01e1dee
Add initial iOS support (#6275)
* Add iOS community triplets and toolchain support

Added an iOS toolchain to enable building packages for iOS.
The toolchain is used when a triplet's VCPKG_CMAKE_SYSTEM_NAME is set
to iOS.

To configure which architecture should be built, as well as other
iOS specifics, the following triplet variables can be set:
- VCPKG_TARGET_ARCHITECTURE
- VCPKG_OSX_SYSROOT
- VCPKG_OSX_DEPLOYMENT_TARGET
- VCPKG_OSX_ARCHITECTURES

The following VCPKG_TARGET_ARCHITECTURE values are currently
supported:
 - arm, arm64, x64, x86.

The following VCPKG_OSX_SYSROOT values are currently supported:
 - iphoneos, iphonesimulator, or an absolute path to the device or
   simulator Xcode SDK.

VCPKG_OSX_DEPLOYMENT_TARGET can be set to control the minimum iOS
delopyment target for the built libraries.

CMAKE_OSX_ARCHITECTURES is derived from VCPKG_TARGET_ARCHITECTURE,
so generally it should not be set. In case if someone needs to target
a more specific architecture (like armv7k or arm64e), it can
be set in the triplet via VCPKG_OSX_ARCHITECTURES.

Note that only certain combinations of the architecture and sysroot
will work: simulator SDKs only provide x86-based libraries, etc.

The toolchain also sets CMAKE_SYSTEM_PROCESSOR for certain
configurations, because certain packages (like libpng) depend on the
processor type.

Added 4 community iOS triplets that build static libraries:
- arm-ios, arm64-ios, x86-ios, x64-ios.
The non-arm triplets target the iOS simulator.

The triplets build static libraries because they are easiest to
integrate into an iOS project. Dynamic libraries or frameworks require
code signing on iOS, which complicates integration.

Added heuristics to try and automatically detect what iOS triplet to
use when building your own CMake project (so when a CMake project sets
CMAKE_TOOLCHAIN_FILE to buildsystems/vcpkg.cmake), if no explicit
triplet is provided (VCPKG_TARGET_TRIPLET is undefined).

The heuristic checks for the values of CMAKE_SYSTEM_NAME and
CMAKE_OSX_ARCHITECTURES. Note that for this to work,
CMAKE_OSX_ARCHITECTURES needs to be set before the first project()
call in your CMake project.

Added workaround so find_package finds vcpkg installed packages
when targeting iOS.
This is done by saving / restoring the value of CMAKE_FIND_ROOT_PATH
while also adding the vcpkg package root in the find_package override
macro.
The workaround can be removed once vcpkg upgrades to CMake 3.15.0
or higher where the issue is fixed.

Fixes: #6003

* Fix building libpng and pcre2 targetting iOS

Fixes: #6003
2020-04-15 13:06:55 -07:00

78 lines
2.4 KiB
CMake

include(vcpkg_common_functions)
set(LIBPNG_VER 1.6.37)
# Download the apng patch
set(LIBPNG_APNG_OPTION )
if ("apng" IN_LIST FEATURES)
set(LIBPNG_APG_PATCH_NAME libpng-${LIBPNG_VER}-apng.patch)
set(LIBPNG_APG_PATCH_PATH ${CURRENT_BUILDTREES_DIR}/src/${LIBPNG_APG_PATCH_NAME})
if (NOT EXISTS ${LIBPNG_APG_PATCH_PATH})
vcpkg_download_distfile(LIBPNG_APNG_PATCH_ARCHIVE
URLS "https://downloads.sourceforge.net/project/libpng-apng/libpng16/${LIBPNG_VER}/${LIBPNG_APG_PATCH_NAME}.gz"
FILENAME "${LIBPNG_APG_PATCH_NAME}.gz"
SHA512 226adcb3a8c60f2267fe2976ab531329ae43c2603dab4d0cf8f16217d64069936b879f3d6516b75d259c47d6f5c5b1f24f887602206c8e46abde0fb7f5c7946b
)
vcpkg_find_acquire_program(7Z)
vcpkg_execute_required_process(
COMMAND ${7Z} x ${LIBPNG_APNG_PATCH_ARCHIVE} -aoa
WORKING_DIRECTORY ${CURRENT_BUILDTREES_DIR}/src
LOGNAME extract-patch.log
)
endif()
set(APNG_EXTRA_PATCH ${LIBPNG_APG_PATCH_PATH})
set(LIBPNG_APNG_OPTION "-DPNG_PREFIX=a")
endif()
vcpkg_from_github(
OUT_SOURCE_PATH SOURCE_PATH
REPO glennrp/libpng
REF v${LIBPNG_VER}
SHA512 ccb3705c23b2724e86d072e2ac8cfc380f41fadfd6977a248d588a8ad57b6abe0e4155e525243011f245e98d9b7afbe2e8cc7fd4ff7d82fcefb40c0f48f88918
HEAD_REF master
PATCHES
use_abort.patch
cmake.patch
${APNG_EXTRA_PATCH}
)
if(VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
set(PNG_STATIC_LIBS OFF)
set(PNG_SHARED_LIBS ON)
else()
set(PNG_STATIC_LIBS ON)
set(PNG_SHARED_LIBS OFF)
endif()
set(LIBPNG_HARDWARE_OPTIMIZATIONS_OPTION )
if(VCPKG_CMAKE_SYSTEM_NAME STREQUAL iOS)
set(LIBPNG_HARDWARE_OPTIMIZATIONS_OPTION "-DPNG_HARDWARE_OPTIMIZATIONS=OFF")
endif()
vcpkg_configure_cmake(
SOURCE_PATH ${SOURCE_PATH}
PREFER_NINJA
OPTIONS
${LIBPNG_APNG_OPTION}
${LIBPNG_HARDWARE_OPTIMIZATIONS_OPTION}
-DPNG_STATIC=${PNG_STATIC_LIBS}
-DPNG_SHARED=${PNG_SHARED_LIBS}
-DPNG_TESTS=OFF
-DSKIP_INSTALL_PROGRAMS=ON
-DSKIP_INSTALL_EXECUTABLES=ON
-DSKIP_INSTALL_FILES=ON
OPTIONS_DEBUG
-DSKIP_INSTALL_HEADERS=ON
)
vcpkg_install_cmake()
vcpkg_fixup_cmake_targets(CONFIG_PATH lib/libpng)
vcpkg_copy_pdbs()
file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)