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CMake/Modules/FindSDL_sound.cmake
Brad King f0ca3ef0a3 Help: Wrap long lines in pre-formatted documentation blocks 
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2014-11-07 10:59:09 -05:00

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CMake
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#.rst:
# FindSDL_sound
# -------------
#
# Locates the SDL_sound library
#
#
#
# This module depends on SDL being found and must be called AFTER
# FindSDL.cmake is called.
#
# This module defines
#
# ::
#
# SDL_SOUND_INCLUDE_DIR, where to find SDL_sound.h
# SDL_SOUND_FOUND, if false, do not try to link to SDL_sound
# SDL_SOUND_LIBRARIES, this contains the list of libraries that you need
# to link against. This is a read-only variable and is marked INTERNAL.
# SDL_SOUND_EXTRAS, this is an optional variable for you to add your own
# flags to SDL_SOUND_LIBRARIES. This is prepended to SDL_SOUND_LIBRARIES.
# This is available mostly for cases this module failed to anticipate for
# and you must add additional flags. This is marked as ADVANCED.
# SDL_SOUND_VERSION_STRING, human-readable string containing the
# version of SDL_sound
#
#
#
# This module also defines (but you shouldn't need to use directly)
#
# ::
#
# SDL_SOUND_LIBRARY, the name of just the SDL_sound library you would link
# against. Use SDL_SOUND_LIBRARIES for you link instructions and not this one.
#
# And might define the following as needed
#
# ::
#
# MIKMOD_LIBRARY
# MODPLUG_LIBRARY
# OGG_LIBRARY
# VORBIS_LIBRARY
# SMPEG_LIBRARY
# FLAC_LIBRARY
# SPEEX_LIBRARY
#
#
#
# Typically, you should not use these variables directly, and you should
# use SDL_SOUND_LIBRARIES which contains SDL_SOUND_LIBRARY and the other
# audio libraries (if needed) to successfully compile on your system.
#
# Created by Eric Wing. This module is a bit more complicated than the
# other FindSDL* family modules. The reason is that SDL_sound can be
# compiled in a large variety of different ways which are independent of
# platform. SDL_sound may dynamically link against other 3rd party
# libraries to get additional codec support, such as Ogg Vorbis, SMPEG,
# ModPlug, MikMod, FLAC, Speex, and potentially others. Under some
# circumstances which I don't fully understand, there seems to be a
# requirement that dependent libraries of libraries you use must also be
# explicitly linked against in order to successfully compile. SDL_sound
# does not currently have any system in place to know how it was
# compiled. So this CMake module does the hard work in trying to
# discover which 3rd party libraries are required for building (if any).
# This module uses a brute force approach to create a test program that
# uses SDL_sound, and then tries to build it. If the build fails, it
# parses the error output for known symbol names to figure out which
# libraries are needed.
#
# Responds to the $SDLDIR and $SDLSOUNDDIR environmental variable that
# would correspond to the ./configure --prefix=$SDLDIR used in building
# SDL.
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of SDL_LIBRARY to
# override this selectionor set the CMake environment CMAKE_INCLUDE_PATH
# to modify the search paths.
#=============================================================================
# Copyright 2005-2009 Kitware, Inc.
# Copyright 2012 Benjamin Eikel
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
set(SDL_SOUND_EXTRAS "" CACHE STRING "SDL_sound extra flags")
mark_as_advanced(SDL_SOUND_EXTRAS)
# Find SDL_sound.h
find_path(SDL_SOUND_INCLUDE_DIR SDL_sound.h
HINTS
ENV SDLSOUNDDIR
ENV SDLDIR
PATH_SUFFIXES SDL
# path suffixes to search inside ENV{SDLDIR}
include/SDL include/SDL12 include/SDL11 include
)
find_library(SDL_SOUND_LIBRARY
NAMES SDL_sound
HINTS
ENV SDLSOUNDDIR
ENV SDLDIR
PATH_SUFFIXES lib VisualC/win32lib
)
if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
# CMake is giving me problems using TRY_COMPILE with the CMAKE_FLAGS
# for the :STRING syntax if I have multiple values contained in a
# single variable. This is a problem for the SDL_LIBRARY variable
# because it does just that. When I feed this variable to the command,
# only the first value gets the appropriate modifier (e.g. -I) and
# the rest get dropped.
# To get multiple single variables to work, I must separate them with a "\;"
# I could go back and modify the FindSDL.cmake module, but that's kind of painful.
# The solution would be to try something like:
# set(SDL_TRY_COMPILE_LIBRARY_LIST "${SDL_TRY_COMPILE_LIBRARY_LIST}\;${CMAKE_THREAD_LIBS_INIT}")
# Instead, it was suggested on the mailing list to write a temporary CMakeLists.txt
# with a temporary test project and invoke that with TRY_COMPILE.
# See message thread "Figuring out dependencies for a library in order to build"
# 2005-07-16
# try_compile(
# MY_RESULT
# ${CMAKE_BINARY_DIR}
# ${PROJECT_SOURCE_DIR}/DetermineSoundLibs.c
# CMAKE_FLAGS
# -DINCLUDE_DIRECTORIES:STRING=${SDL_INCLUDE_DIR}\;${SDL_SOUND_INCLUDE_DIR}
# -DLINK_LIBRARIES:STRING=${SDL_SOUND_LIBRARY}\;${SDL_LIBRARY}
# OUTPUT_VARIABLE MY_OUTPUT
# )
# To minimize external dependencies, create a sdlsound test program
# which will be used to figure out if additional link dependencies are
# required for the link phase.
file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/DetermineSoundLibs.c
"#include \"SDL_sound.h\"
#include \"SDL.h\"
int main(int argc, char* argv[])
{
Sound_AudioInfo desired;
Sound_Sample* sample;
SDL_Init(0);
Sound_Init();
/* This doesn't actually have to work, but Init() is a no-op
* for some of the decoders, so this should force more symbols
* to be pulled in.
*/
sample = Sound_NewSampleFromFile(argv[1], &desired, 4096);
Sound_Quit();
SDL_Quit();
return 0;
}"
)
# Calling
# target_link_libraries(DetermineSoundLibs "${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
# causes problems when SDL_LIBRARY looks like
# /Library/Frameworks/SDL.framework;-framework Cocoa
# The ;-framework Cocoa seems to be confusing CMake once the OS X
# framework support was added. I was told that breaking up the list
# would fix the problem.
set(TMP_TRY_LIBS)
foreach(lib ${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
set(TMP_TRY_LIBS "${TMP_TRY_LIBS} \"${lib}\"")
endforeach()
# message("TMP_TRY_LIBS ${TMP_TRY_LIBS}")
# Write the CMakeLists.txt and test project
# Weird, this is still sketchy. If I don't quote the variables
# in the TARGET_LINK_LIBRARIES, I seem to loose everything
# in the SDL_LIBRARY string after the "-framework".
# But if I quote the stuff in INCLUDE_DIRECTORIES, it doesn't work.
file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/CMakeLists.txt
"cmake_minimum_required(VERSION ${CMAKE_VERSION})
project(DetermineSoundLibs)
include_directories(${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
add_executable(DetermineSoundLibs DetermineSoundLibs.c)
target_link_libraries(DetermineSoundLibs ${TMP_TRY_LIBS})"
)
try_compile(
MY_RESULT
${PROJECT_BINARY_DIR}/CMakeTmp
${PROJECT_BINARY_DIR}/CMakeTmp
DetermineSoundLibs
OUTPUT_VARIABLE MY_OUTPUT
)
# message("${MY_RESULT}")
# message(${MY_OUTPUT})
if(NOT MY_RESULT)
# I expect that MPGLIB, VOC, WAV, AIFF, and SHN are compiled in statically.
# I think Timidity is also compiled in statically.
# I've never had to explcitly link against Quicktime, so I'll skip that for now.
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARY})
# Find MikMod
if("${MY_OUTPUT}" MATCHES "MikMod_")
find_library(MIKMOD_LIBRARY
NAMES libmikmod-coreaudio mikmod
PATHS
ENV MIKMODDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(MIKMOD_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MIKMOD_LIBRARY})
endif(MIKMOD_LIBRARY)
endif("${MY_OUTPUT}" MATCHES "MikMod_")
# Find ModPlug
if("${MY_OUTPUT}" MATCHES "MODPLUG_")
find_library(MODPLUG_LIBRARY
NAMES modplug
PATHS
ENV MODPLUGDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(MODPLUG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MODPLUG_LIBRARY})
endif()
endif()
# Find Ogg and Vorbis
if("${MY_OUTPUT}" MATCHES "ov_")
find_library(VORBIS_LIBRARY
NAMES vorbis Vorbis VORBIS
PATHS
ENV VORBISDIR
ENV OGGDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(VORBIS_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${VORBIS_LIBRARY})
endif()
find_library(OGG_LIBRARY
NAMES ogg Ogg OGG
PATHS
ENV OGGDIR
ENV VORBISDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(OGG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
endif()
endif()
# Find SMPEG
if("${MY_OUTPUT}" MATCHES "SMPEG_")
find_library(SMPEG_LIBRARY
NAMES smpeg SMPEG Smpeg SMpeg
PATHS
ENV SMPEGDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(SMPEG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SMPEG_LIBRARY})
endif()
endif()
# Find FLAC
if("${MY_OUTPUT}" MATCHES "FLAC_")
find_library(FLAC_LIBRARY
NAMES flac FLAC
PATHS
ENV FLACDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(FLAC_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${FLAC_LIBRARY})
endif()
endif()
# Hmmm...Speex seems to depend on Ogg. This might be a problem if
# the TRY_COMPILE attempt gets blocked at SPEEX before it can pull
# in the Ogg symbols. I'm not sure if I should duplicate the ogg stuff
# above for here or if two ogg entries will screw up things.
if("${MY_OUTPUT}" MATCHES "speex_")
find_library(SPEEX_LIBRARY
NAMES speex SPEEX
PATHS
ENV SPEEXDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
)
if(SPEEX_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SPEEX_LIBRARY})
endif()
# Find OGG (needed for Speex)
# We might have already found Ogg for Vorbis, so skip it if so.
if(NOT OGG_LIBRARY)
find_library(OGG_LIBRARY
NAMES ogg Ogg OGG
PATHS
ENV OGGDIR
ENV VORBISDIR
ENV SPEEXDIR
ENV SDLSOUNDDIR
ENV SDLDIR
/sw
/opt/local
/opt/csw
/opt
PATH_SUFFIXES lib
)
if(OGG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
endif()
endif()
endif()
else()
set(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARY}" CACHE INTERNAL "SDL_sound and dependent libraries")
endif()
set(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARIES_TMP}" CACHE INTERNAL "SDL_sound and dependent libraries")
endif()
if(SDL_SOUND_INCLUDE_DIR AND EXISTS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h")
file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SOUND_VER_MAJOR[ \t]+[0-9]+$")
file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_MINOR_LINE REGEX "^#define[ \t]+SOUND_VER_MINOR[ \t]+[0-9]+$")
file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_PATCH_LINE REGEX "^#define[ \t]+SOUND_VER_PATCH[ \t]+[0-9]+$")
string(REGEX REPLACE "^#define[ \t]+SOUND_VER_MAJOR[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_MAJOR "${SDL_SOUND_VERSION_MAJOR_LINE}")
string(REGEX REPLACE "^#define[ \t]+SOUND_VER_MINOR[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_MINOR "${SDL_SOUND_VERSION_MINOR_LINE}")
string(REGEX REPLACE "^#define[ \t]+SOUND_VER_PATCH[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_PATCH "${SDL_SOUND_VERSION_PATCH_LINE}")
set(SDL_SOUND_VERSION_STRING ${SDL_SOUND_VERSION_MAJOR}.${SDL_SOUND_VERSION_MINOR}.${SDL_SOUND_VERSION_PATCH})
unset(SDL_SOUND_VERSION_MAJOR_LINE)
unset(SDL_SOUND_VERSION_MINOR_LINE)
unset(SDL_SOUND_VERSION_PATCH_LINE)
unset(SDL_SOUND_VERSION_MAJOR)
unset(SDL_SOUND_VERSION_MINOR)
unset(SDL_SOUND_VERSION_PATCH)
endif()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL_sound
REQUIRED_VARS SDL_SOUND_LIBRARY SDL_SOUND_INCLUDE_DIR
VERSION_VAR SDL_SOUND_VERSION_STRING)
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