fd5cd80935
This is a big commit and there are too many changes to list them all.
The main changes are:
- rename all CMake build options to 'FLTK_*'
- export library targets with namespace (prefix) 'fltk::'
- standardize shared library target names with suffix '-shared'
- set public build properties on libraries for consumers
- document library names and aliases in README.CMake.txt
- document changes in "Migrating Code from FLTK 1.3 to 1.4"
- partial backwards compatibility for old user projects
Included but not directly related changes:
- fix Windows (Visual Studio) DLL build
- add CMake function fl_debug_target() to show target properties
- don't build test programs if FLTK is a subproject
- internal: reformat CMake code: remove space before '('
Thanks to Matthias and Manolo for their help, testing, and feeback.
142 lines
4.3 KiB
CMake
142 lines
4.3 KiB
CMake
#
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# PNG library CMake configuration for the Fast Light Toolkit (FLTK).
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#
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# Copyright 1998-2024 by Bill Spitzak and others.
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#
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# This library is free software. Distribution and use rights are outlined in
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# the file "COPYING" which should have been included with this file. If this
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# file is missing or damaged, see the license at:
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#
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# https://www.fltk.org/COPYING.php
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#
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# Please see the following page on how to report bugs and issues:
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#
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# https://www.fltk.org/bugs.php
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#
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# source files for png
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set(PNG_SRCS
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png.c
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pngerror.c
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pngget.c
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pngmem.c
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pngpread.c
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pngread.c
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pngrio.c
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pngrtran.c
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pngrutil.c
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pngset.c
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pngtrans.c
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pngwio.c
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pngwrite.c
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pngwtran.c
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pngwutil.c
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)
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#######################################################################
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# Note: This file is used only if we build the bundled PNG library,
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# and if we do this we MUST also build and use the *bundled* ZLIB,
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# hence we also link against the bundled ZLIB. Therefore there's
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# no need to check which ZLIB version to use in this context.
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#######################################################################
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#######################################################################
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# Build some files on ARM (e.g. Apple M1 systems)
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#######################################################################
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# We can only determine the target architecture if it is set
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# in CMAKE_OSX_ARCHITECTURES, otherwise we *assume* it is true and
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# compile these files even if this results in some warnings.
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# This includes all non-macOS platforms.
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if(CMAKE_OSX_ARCHITECTURES)
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string(REGEX MATCH "arm64" is_arm "${CMAKE_OSX_ARCHITECTURES}")
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else()
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set(is_arm TRUE)
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endif()
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if(is_arm)
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list(APPEND PNG_SRCS
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arm/arm_init.c
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arm/filter_neon_intrinsics.c
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arm/palette_neon_intrinsics.c
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)
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endif()
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unset(is_arm)
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#######################################################################
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# Build some files on ppc64.
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# We compile these files whatever the architecture resulting in
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# void code on non-ppc64 architectures.
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#######################################################################
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list(APPEND PNG_SRCS
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powerpc/powerpc_init.c
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powerpc/filter_vsx_intrinsics.c
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)
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#######################################################################
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# Set common variables for static and shared builds
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#######################################################################
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set(compile_defs
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HAVE_PNG_H=1
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HAVE_PNG_GET_VALID=1
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HAVE_PNG_SET_TRNS_TO_ALPHA=1
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)
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set(include_dirs
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$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
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$<INSTALL_INTERFACE:include>
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)
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#######################################################################
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# Build the static library
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#######################################################################
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fl_add_library(fltk_png STATIC "${PNG_SRCS}")
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set(target fltk_png)
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target_link_libraries (${target} PUBLIC fltk::z)
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target_compile_definitions(${target} PUBLIC ${compile_defs})
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target_include_directories(${target} PUBLIC ${include_dirs})
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list(APPEND FLTK_IMAGE_LIBRARIES fltk::png)
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# Propagate to parent scope (modified by fl_add_library and here)
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set(FLTK_LIBRARIES ${FLTK_LIBRARIES} PARENT_SCOPE)
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set(FLTK_IMAGE_LIBRARIES ${FLTK_IMAGE_LIBRARIES} PARENT_SCOPE)
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#######################################################################
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# Build the shared library (optional)
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#######################################################################
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if(FLTK_BUILD_SHARED_LIBS)
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# ensure to export all symbols for Windows DLL's
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set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
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fl_add_library(fltk_png SHARED "${PNG_SRCS}")
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set(target fltk_png-shared)
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target_link_libraries (${target} PUBLIC fltk::z-shared)
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target_compile_definitions(${target} PUBLIC ${compile_defs})
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target_include_directories(${target} PUBLIC ${include_dirs})
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list(APPEND FLTK_IMAGE_LIBRARIES_SHARED fltk::png-shared)
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# Propagate to parent scope (modified by fl_add_library and here)
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set(FLTK_LIBRARIES_SHARED ${FLTK_LIBRARIES_SHARED} PARENT_SCOPE)
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set(FLTK_IMAGE_LIBRARIES_SHARED ${FLTK_IMAGE_LIBRARIES_SHARED} PARENT_SCOPE)
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endif()
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#######################################################################
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# Install the library headers
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#######################################################################
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install(FILES png.h pngconf.h pnglibconf.h pngprefix.h
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DESTINATION ${FLTK_INCLUDEDIR}/FL/images
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)
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