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cmake: Use Zlib as a package

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1. automatic linking of the library and add include directory
2. properly specify include directories

Signed-off-by: Cosmin Truta <ctruta@gmail.com>
This commit is contained in:
Timothy Lyanguzov 2023-11-13 15:55:36 +13:00 committed by Cosmin Truta
parent e1088f99d4
commit 1460b3ce78
1 changed files with 22 additions and 8 deletions
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30
CMakeLists.txt
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@ -93,17 +93,17 @@ endif()
option(PNG_BUILD_ZLIB "Custom zlib location, else find_package is used" OFF)
if(NOT PNG_BUILD_ZLIB)
find_package(ZLIB REQUIRED)
include_directories(${ZLIB_INCLUDE_DIRS})
endif()
if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU AND NOT EMSCRIPTEN)
find_library(M_LIBRARY m)
if(NOT M_LIBRARY)
if(M_LIBRARY)
set(M_LIBRARY m)
else()
set(M_LIBRARY "")
endif()
else()
# libm is not needed and/or not available.
set(M_LIBRARY "")
endif()
# CMake currently sets CMAKE_SYSTEM_PROCESSOR to one of x86_64 or arm64 on macOS,
@ -619,7 +619,6 @@ if(PNG_DEBUG)
endif()
# Now build our targets.
include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIRS})
# Initialize the list of libpng library targets.
set(PNG_LIBRARY_TARGETS "")
@ -663,7 +662,12 @@ if(PNG_SHARED)
if(WIN32)
set_target_properties(png_shared PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
endif()
target_link_libraries(png_shared ${ZLIB_LIBRARIES} ${M_LIBRARY})
target_include_directories(png_shared
PUBLIC
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(png_shared PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(PNG_STATIC)
@ -673,7 +677,12 @@ if(PNG_STATIC)
set_target_properties(png_static PROPERTIES
OUTPUT_NAME "${PNG_STATIC_OUTPUT_NAME}"
DEBUG_POSTFIX "${PNG_DEBUG_POSTFIX}")
target_link_libraries(png_static ${ZLIB_LIBRARIES} ${M_LIBRARY})
target_include_directories(png_static
PUBLIC
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(png_static PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(PNG_FRAMEWORK)
@ -689,7 +698,12 @@ if(PNG_FRAMEWORK)
XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
PUBLIC_HEADER "${libpng_public_hdrs}"
OUTPUT_NAME "png")
target_link_libraries(png_framework ${ZLIB_LIBRARIES} ${M_LIBRARY})
target_include_directories(png_framework
PUBLIC
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(png_framework PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(NOT PNG_LIBRARY_TARGETS)
@ -894,7 +908,7 @@ if(PNG_SHARED AND PNG_TOOLS)
set(PNG_BIN_TARGETS pngfix)
add_executable(png-fix-itxt ${png_fix_itxt_sources})
target_link_libraries(png-fix-itxt PRIVATE ${ZLIB_LIBRARIES} ${M_LIBRARY})
target_link_libraries(png-fix-itxt PRIVATE ZLIB::ZLIB ${M_LIBRARY})
list(APPEND PNG_BIN_TARGETS png-fix-itxt)
endif()