Remove FindSDL2 find-module, use sdl2-config.cmake instead
This requires SDL >= 2.0.4.
Since <https://bugzilla.libsdl.org/show_bug.cgi?id=2464> was fixed in
SDL 2.0.4, SDL behaves as a CMake "config-file package", even if it was
not itself built using CMake: it installs a sdl2-config.cmake file to
${libdir}/cmake/SDL2, which tells CMake where to find SDL's headers and
library, analogous to a pkg-config .pc file.
As a result, we no longer need to copy/paste a "find-module package"
to be able to find a system copy of SDL >= 2.0.4 with find_package(SDL2).
Find-module packages are now discouraged by the CMake developers, in
favour of having upstream projects behave as config-file packages.
This results in a small API change: FindSDL2 used to set SDL2_INCLUDE_DIR
and SDL2_LIBRARY, but the standard behaviour for config-file packages is
to set <name>_INCLUDE_DIRS and <name>_LIBRARIES. Use the CONFIG keyword
to make sure we search in config-file package mode, and will not find a
FindSDL2.cmake in some other directory that implements the old interface.
In addition to deleting redundant code, this avoids some assumptions in
FindSDL2 about the layout of a SDL installation. The current libsdl2-dev
package in Debian breaks those assumptions; this is considered a bug
and will hopefully be fixed soon, but it illustrates how fragile these
assumptions can be. We can be more robust against different installation
layouts by relying on SDL's own CMake integration.
When linking to a copy of CMake in a non-standard location, users can
now set the SDL2_DIR or CMAKE_PREFIX_PATH environment variable to point
to it; previously, these users would have used the SDL2DIR environment
variable. This continues to be unnecessary if using matching system-wide
installations of CMake and SDL2, for example both from Debian.
# Find ffmpeg/libav libraries (libavcodec, libavformat and libavutil)
# Once done this will define
#
# LIBAV_FOUND - system has libavcodec, libavformat, libavutil
# LIBAV_INCLUDE_DIR - libav include directories
# LIBAV_LIBRARIES - libav libraries (libavcodec, libavformat, libavutil)
#
# LIBAVCODEC_LIBRARY - libavcodec library
# LIBAVCODEC_INCLUDE_DIR - libavcodec include directory
# LIBAVFORMAT_LIBRARY - libavformat library
# LIBAVUTIL_LIBRARY - libavutil library
#
# Copyright (c) 2008 Andreas Schneider <mail@cynapses.org>
# Modified for other libraries by Lasse Kärkkäinen <tronic>
# Modified for Hedgewars by Stepik777
# Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
#
# Redistribution and use is allowed according to the terms of the New
# BSD license.
#
include(FindPackageHandleStandardArgs)
# use pkg-config to get the directories and then use these values
# in the FIND_PATH() and FIND_LIBRARY() calls
find_package(PkgConfig)
if(PKG_CONFIG_FOUND)
if(NOT LIBAVCODEC_INCLUDE_DIR OR NOT LIBAVCODEC_LIBRARY)
pkg_check_modules(_LIBAV_AVCODEC libavcodec)
endif()
if(NOT LIBAVFORMAT_LIBRARY)
pkg_check_modules(_LIBAV_AVFORMAT libavformat)
endif()
if(NOT LIBAVUTIL_LIBRARY)
pkg_check_modules(_LIBAV_AVUTIL libavutil)
endif()
endif(PKG_CONFIG_FOUND)
find_path(LIBAVCODEC_INCLUDE_DIR
NAMES libavcodec/avcodec.h
PATHS ${_LIBAV_AVCODEC_INCLUDE_DIRS} #pkg-config
/usr/include /usr/local/include #system level
/opt/local/include /sw/include #macports & fink
PATH_SUFFIXES libav ffmpeg
)
#TODO: add other include paths
find_library(LIBAVCODEC_LIBRARY
NAMES avcodec
PATHS ${_LIBAV_AVCODEC_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_library(LIBAVFORMAT_LIBRARY
NAMES avformat
PATHS ${_LIBAV_AVFORMAT_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_library(LIBAVUTIL_LIBRARY
NAMES avutil
PATHS ${_LIBAV_AVUTIL_LIBRARY_DIRS} #pkg-config
/usr/lib /usr/local/lib #system level
/opt/local/lib /sw/lib #macports & fink
)
find_package_handle_standard_args(LIBAV DEFAULT_MSG LIBAVCODEC_LIBRARY
LIBAVCODEC_INCLUDE_DIR
LIBAVFORMAT_LIBRARY
LIBAVUTIL_LIBRARY
)
set(LIBAV_INCLUDE_DIR ${LIBAVCODEC_INCLUDE_DIR}
#TODO: add other include paths
)
set(LIBAV_LIBRARIES ${LIBAVCODEC_LIBRARY}
${LIBAVFORMAT_LIBRARY}
${LIBAVUTIL_LIBRARY}
)
mark_as_advanced(LIBAV_INCLUDE_DIR
LIBAV_LIBRARIES
LIBAVCODEC_LIBRARY
LIBAVCODEC_INCLUDE_DIR
LIBAVFORMAT_LIBRARY
LIBAVUTIL_LIBRARY)