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CMake/Modules/FindSDL_sound.cmake
Bill Hoffman 6482d38bdf ENH: do not clear find variables
2008-04-25 09:07:02 -04:00

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CMake
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# 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
# 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.
#
# 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.
#
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
$ENV{SDLSOUNDDIR}/include
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/include
$ENV{SDLDIR}
NO_DEFAULT_PATH
)
FIND_PATH(SDL_SOUND_INCLUDE_DIR SDL_sound.h
NO_DEFAULT_PATH
)
FIND_PATH(SDL_SOUND_INCLUDE_DIR SDL_sound.h
/usr/local/include/SDL
/usr/include/SDL
/usr/local/include/SDL12
/usr/local/include/SDL11 # FreeBSD ports
/usr/include/SDL12
/usr/include/SDL11
/usr/local/include
/usr/include
/sw/include/SDL # Fink
/sw/include
/opt/local/include/SDL # DarwinPorts
/opt/local/include
/opt/csw/include/SDL # Blastwave
/opt/csw/include
/opt/include/SDL
/opt/include
)
FIND_LIBRARY(SDL_SOUND_LIBRARY
NAMES SDL_sound
PATHS
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
SET(SDL_SOUND_FOUND "NO")
IF(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
# CMake is giving me problems using TRY_COMPILE with the CMAKE_FLAGS
# for the :STRING syntax if I have multiple values contained in a
# single variable. This is a problem for the SDL_LIBRARY variable
# because it does just that. When I feed this variable to the command,
# only the first value gets the appropriate modifier (e.g. -I) and
# the rest get dropped.
# To get multiple single variables to work, I must separate them with a "\;"
# I could go back and modify the FindSDL.cmake module, but that's kind of painful.
# The solution would be to try something like:
# SET(SDL_TRY_COMPILE_LIBRARY_LIST "${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(lib)
# 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 ${PROJECT_BINARY_DIR}/CMakeTmp/CMakeLists.txt
"PROJECT(DetermineSoundLibs)
INCLUDE_DIRECTORIES(${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}/lib
$ENV{MIKMODDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/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}/lib
$ENV{MODPLUGDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(MODPLUG_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MODPLUG_LIBRARY})
ENDIF(MODPLUG_LIBRARY)
ENDIF("${MY_OUTPUT}" MATCHES "MODPLUG_")
# Find Ogg and Vorbis
IF("${MY_OUTPUT}" MATCHES "ov_")
FIND_LIBRARY(VORBIS_LIBRARY
NAMES vorbis Vorbis VORBIS
PATHS
$ENV{VORBISDIR}/lib
$ENV{VORBISDIR}
$ENV{OGGDIR}/lib
$ENV{OGGDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(VORBIS_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${VORBIS_LIBRARY})
ENDIF(VORBIS_LIBRARY)
FIND_LIBRARY(OGG_LIBRARY
NAMES ogg Ogg OGG
PATHS
$ENV{OGGDIR}/lib
$ENV{OGGDIR}
$ENV{VORBISDIR}/lib
$ENV{VORBISDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(OGG_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
ENDIF(OGG_LIBRARY)
ENDIF("${MY_OUTPUT}" MATCHES "ov_")
# Find SMPEG
IF("${MY_OUTPUT}" MATCHES "SMPEG_")
FIND_LIBRARY(SMPEG_LIBRARY
NAMES smpeg SMPEG Smpeg SMpeg
PATHS
$ENV{SMPEGDIR}/lib
$ENV{SMPEGDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(SMPEG_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SMPEG_LIBRARY})
ENDIF(SMPEG_LIBRARY)
ENDIF("${MY_OUTPUT}" MATCHES "SMPEG_")
# Find FLAC
IF("${MY_OUTPUT}" MATCHES "FLAC_")
FIND_LIBRARY(FLAC_LIBRARY
NAMES flac FLAC
PATHS
$ENV{FLACDIR}/lib
$ENV{FLACDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(FLAC_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${FLAC_LIBRARY})
ENDIF(FLAC_LIBRARY)
ENDIF("${MY_OUTPUT}" MATCHES "FLAC_")
# 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}/lib
$ENV{SPEEXDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(SPEEX_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SPEEX_LIBRARY})
ENDIF(SPEEX_LIBRARY)
# 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}/lib
$ENV{OGGDIR}
$ENV{VORBISDIR}/lib
$ENV{VORBISDIR}
$ENV{SPEEXDIR}/lib
$ENV{SPEEXDIR}
$ENV{SDLSOUNDDIR}/lib
$ENV{SDLSOUNDDIR}
$ENV{SDLDIR}/lib
$ENV{SDLDIR}
/usr/local/lib
/usr/lib
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
)
IF(OGG_LIBRARY)
SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
ENDIF(OGG_LIBRARY)
ENDIF(NOT OGG_LIBRARY)
ENDIF("${MY_OUTPUT}" MATCHES "speex_")
ELSE(NOT MY_RESULT)
SET(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARY}" CACHE INTERNAL "SDL_sound and dependent libraries")
ENDIF(NOT MY_RESULT)
SET(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARIES_TMP}" CACHE INTERNAL "SDL_sound and dependent libraries")
SET(SDL_SOUND_FOUND "YES")
ENDIF(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
# MESSAGE("SDL_SOUND_LIBRARIES is ${SDL_SOUND_LIBRARIES}")
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