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.
# Determine the compiler to use for Pascal programs
# NOTE, a generator may set CMAKE_Pascal_COMPILER before
# loading this file to force a compiler.
# use environment variable Pascal first if defined by user, next use
# the cmake variable CMAKE_GENERATOR_PASCAL which can be defined by a generator
# as a default compiler
# NOTE: on Darwin cmake >= 2.8.11 until cmake <= 2.8.12.1 will add an incompatible
# -F flag to <FLAGS> so you won't be able to use those versions with this script
if(NOT CMAKE_Pascal_COMPILER)
# prefer the environment variable FPC
if($ENV{FPC} MATCHES ".+")
get_filename_component(CMAKE_Pascal_COMPILER_INIT $ENV{FPC} PROGRAM PROGRAM_ARGS CMAKE_Pascal_FLAGS_ENV_INIT)
if(CMAKE_Pascal_FLAGS_ENV_INIT)
set(CMAKE_Pascal_COMPILER_ARG1 "${CMAKE_Pascal_FLAGS_ENV_INIT}" CACHE STRING "First argument to Pascal compiler")
endif(CMAKE_Pascal_FLAGS_ENV_INIT)
if(EXISTS ${CMAKE_Pascal_COMPILER_INIT})
else(EXISTS ${CMAKE_Pascal_COMPILER_INIT})
message(FATAL_ERROR "Could not find compiler set in environment variable FPC:\n$ENV{FPC}.")
endif(EXISTS ${CMAKE_Pascal_COMPILER_INIT})
endif($ENV{FPC} MATCHES ".+")
# next try prefer the compiler specified by the generator
if(CMAKE_GENERATOR_PASCAL)
if(NOT CMAKE_Pascal_COMPILER_INIT)
set(CMAKE_Pascal_COMPILER_INIT ${CMAKE_GENERATOR_PASCAL})
endif(NOT CMAKE_Pascal_COMPILER_INIT)
endif(CMAKE_GENERATOR_PASCAL)
# finally list compilers to try
if(CMAKE_Pascal_COMPILER_INIT)
set(CMAKE_Pascal_COMPILER_LIST ${CMAKE_Pascal_COMPILER_INIT})
else(CMAKE_Pascal_COMPILER_INIT)
set(CMAKE_Pascal_COMPILER_LIST fpc)
endif(CMAKE_Pascal_COMPILER_INIT)
# Find the compiler.
find_program(CMAKE_Pascal_COMPILER NAMES ${CMAKE_Pascal_COMPILER_LIST} DOC "Pascal compiler")
if(CMAKE_Pascal_COMPILER_INIT AND NOT CMAKE_Pascal_COMPILER)
set(CMAKE_Pascal_COMPILER "${CMAKE_Pascal_COMPILER_INIT}" CACHE FILEPATH "Pascal compiler" FORCE)
endif(CMAKE_Pascal_COMPILER_INIT AND NOT CMAKE_Pascal_COMPILER)
endif(NOT CMAKE_Pascal_COMPILER)
mark_as_advanced(CMAKE_Pascal_COMPILER)
if(NOT CMAKE_Pascal_COMPILER_VERSION)
execute_process(COMMAND ${CMAKE_Pascal_COMPILER} -iV
OUTPUT_VARIABLE CMAKE_Pascal_COMPILER_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE
) # we assume no error for something so simple
set(CMAKE_Pascal_COMPILER_ARG1 "-l- -v0ewn")
endif(NOT CMAKE_Pascal_COMPILER_VERSION)
mark_as_advanced(CMAKE_Pascal_COMPILER_VERSION)
get_filename_component(COMPILER_LOCATION "${CMAKE_Pascal_COMPILER}" PATH)
# configure variables set in this file for fast reload later on
if(${CMAKE_VERSION} VERSION_LESS 2.8.10)
configure_file(${CMAKE_MODULE_PATH}/CMakePascalCompiler.cmake.in
"${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CMakePascalCompiler.cmake"
IMMEDIATE )
else(${CMAKE_VERSION} VERSION_LESS 2.8.10)
configure_file(${CMAKE_MODULE_PATH}/CMakePascalCompiler.cmake.in
"${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/${CMAKE_VERSION}/CMakePascalCompiler.cmake"
IMMEDIATE )
endif(${CMAKE_VERSION} VERSION_LESS 2.8.10)
set(CMAKE_Pascal_COMPILER_ENV_VAR "FPC")