Building a WASM

[bernardbaker]

Expected behavior:
The WASM is generated with the exported functions.

Actual behavior:
No functions appear to be exported.

Steps to reproduce the problem:
There are two make files. One for compiling the source. And the second for emscripten.

Compile source:

# Compiler and linker flags
CXXFLAGS = -I./include -O3 -D WITH_NULL=1

# Source files
SRCS = $(wildcard ./src/**/*.cpp)

# Object files
OBJS = $(SRCS:.cpp=.o)

# Build rules
.PHONY: all clean

all: libs

libs: $(OBJS)
	ar rcs lib/libsoloud.a $^

%.o: %.cpp
	$(CXX) $(CXXFLAGS) -c -o $@ $<

clean:
	rm -f $(OBJS) lib/libsoloud.a

Compile WASM:

# Compiler and linker flags
CXXFLAGS = -03 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s LLD_REPORT_UNDEFINED -s EXPORTED_FUNCTIONS="@exports.txt"
LDFLAGS = -L./lib -lsoloud


# Object files
OBJS = $(wildcard ./src/*.o)


# Exported functions
EXPORTS = $(shell nm -gC --extern-only --format=posix ./lib/libsoloud.a | grep -E '^_[[:alnum:]]+_' | awk '{ print $$1 }')

# Build rules
.PHONY: all clean

all: exports.txt soloud.js

# soloud.js: $(OBJS)
soloud.js:
	emcc $(CXXFLAGS) $(LDFLAGS) -o $@ $^

exports.txt:
	echo $(EXPORTS) | tr ' ' '\n' > exports.txt

clean:
	rm -f $(OBJS) soloud.js exports.txt

The command expands to:

emcc -03 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s LLD_REPORT_UNDEFINED -s EXPORTED_FUNCTIONS="@exports.txt" -L./lib -lsoloud -o soloud.js 

The error:

emcc: error: undefined exported symbol: "_BassboostFilter_create" [-Wundefined] [-Werror]
make: *** [soloud.js] Error 1

The file with the exported functions:

_BassboostFilter_create
_BassboostFilter_destroy
_BassboostFilter_getParamCount
_BassboostFilter_getParamMax
_BassboostFilter_getParamMin
_BassboostFilter_getParamName
_BassboostFilter_getParamType
_BassboostFilter_setParams
_BiquadResonantFilter_create
_BiquadResonantFilter_destroy
_BiquadResonantFilter_getParamCount
_BiquadResonantFilter_getParamMax
_BiquadResonantFilter_getParamMin
_BiquadResonantFilter_getParamName
_BiquadResonantFilter_getParamType
_BiquadResonantFilter_setParams
_Bus_annexSound
_Bus_calcFFT
_Bus_create
_Bus_destroy
_Bus_getActiveVoiceCount
_Bus_getApproximateVolume
_Bus_getLoopPoint
_Bus_getWave
_Bus_play
_Bus_play3d
_Bus_play3dClocked
_Bus_play3dClockedEx
_Bus_play3dEx
_Bus_playClocked
_Bus_playClockedEx
_Bus_playEx
_Bus_set3dAttenuation
_Bus_set3dAttenuator
_Bus_set3dCollider
_Bus_set3dColliderEx
_Bus_set3dDistanceDelay
_Bus_set3dDopplerFactor
_Bus_set3dListenerRelative
_Bus_set3dMinMaxDistance
_Bus_setChannels
_Bus_setFilter
_Bus_setInaudibleBehavior
_Bus_setLoopPoint
_Bus_setLooping
_Bus_setVisualizationEnable
_Bus_setVolume
_Bus_stop
_DCRemovalFilter_create
_DCRemovalFilter_destroy
_DCRemovalFilter_getParamCount
_DCRemovalFilter_getParamMax
_DCRemovalFilter_getParamMin
_DCRemovalFilter_getParamName
_DCRemovalFilter_getParamType
_DCRemovalFilter_setParams
_DCRemovalFilter_setParamsEx
_EchoFilter_create
_EchoFilter_destroy
_EchoFilter_getParamCount
_EchoFilter_getParamMax
_EchoFilter_getParamMin
_EchoFilter_getParamName
_EchoFilter_getParamType
_EchoFilter_setParams
_EchoFilter_setParamsEx
_FFTFilter_create
_FFTFilter_destroy
_FFTFilter_getParamCount
_FFTFilter_getParamMax
_FFTFilter_getParamMin
_FFTFilter_getParamName
_FFTFilter_getParamType
_FlangerFilter_create
_FlangerFilter_destroy
_FlangerFilter_getParamCount
_FlangerFilter_getParamMax
_FlangerFilter_getParamMin
_FlangerFilter_getParamName
_FlangerFilter_getParamType
_FlangerFilter_setParams
_FreeverbFilter_create
_FreeverbFilter_destroy
_FreeverbFilter_getParamCount
_FreeverbFilter_getParamMax
_FreeverbFilter_getParamMin
_FreeverbFilter_getParamName
_FreeverbFilter_getParamType
_FreeverbFilter_setParams
_LofiFilter_create
_LofiFilter_destroy
_LofiFilter_getParamCount
_LofiFilter_getParamMax
_LofiFilter_getParamMin
_LofiFilter_getParamName
_LofiFilter_getParamType
_LofiFilter_setParams
_Monotone_create
_Monotone_destroy
_Monotone_getLoopPoint
_Monotone_load
_Monotone_loadFile
_Monotone_loadMem
_Monotone_loadMemEx
_Monotone_set3dAttenuation
_Monotone_set3dAttenuator
_Monotone_set3dCollider
_Monotone_set3dColliderEx
_Monotone_set3dDistanceDelay
_Monotone_set3dDopplerFactor
_Monotone_set3dListenerRelative
_Monotone_set3dMinMaxDistance
_Monotone_setFilter
_Monotone_setInaudibleBehavior
_Monotone_setLoopPoint
_Monotone_setLooping
_Monotone_setParams
_Monotone_setParamsEx
_Monotone_setVolume
_Monotone_stop
_Noise_create
_Noise_destroy
_Noise_getLoopPoint
_Noise_set3dAttenuation
_Noise_set3dAttenuator
_Noise_set3dCollider
_Noise_set3dColliderEx
_Noise_set3dDistanceDelay
_Noise_set3dDopplerFactor
_Noise_set3dListenerRelative
_Noise_set3dMinMaxDistance
_Noise_setFilter
_Noise_setInaudibleBehavior
_Noise_setLoopPoint
_Noise_setLooping
_Noise_setOctaveScale
_Noise_setType
_Noise_setVolume
_Noise_stop
_Openmpt_create
_Openmpt_destroy
_Openmpt_getLoopPoint
_Openmpt_load
_Openmpt_loadFile
_Openmpt_loadMem
_Openmpt_loadMemEx
_Openmpt_set3dAttenuation
_Openmpt_set3dAttenuator
_Openmpt_set3dCollider
_Openmpt_set3dColliderEx
_Openmpt_set3dDistanceDelay
_Openmpt_set3dDopplerFactor
_Openmpt_set3dListenerRelative
_Openmpt_set3dMinMaxDistance
_Openmpt_setFilter
_Openmpt_setInaudibleBehavior
_Openmpt_setLoopPoint
_Openmpt_setLooping
_Openmpt_setVolume
_Openmpt_stop
_Queue_create
_Queue_destroy
_Queue_getLoopPoint
_Queue_getQueueCount
_Queue_isCurrentlyPlaying
_Queue_play
_Queue_set3dAttenuation
_Queue_set3dAttenuator
_Queue_set3dCollider
_Queue_set3dColliderEx
_Queue_set3dDistanceDelay
_Queue_set3dDopplerFactor
_Queue_set3dListenerRelative
_Queue_set3dMinMaxDistance
_Queue_setFilter
_Queue_setInaudibleBehavior
_Queue_setLoopPoint
_Queue_setLooping
_Queue_setParams
_Queue_setParamsEx
_Queue_setParamsFromAudioSource
_Queue_setVolume
_Queue_stop
_RobotizeFilter_create
_RobotizeFilter_destroy
_RobotizeFilter_getParamCount
_RobotizeFilter_getParamMax
_RobotizeFilter_getParamMin
_RobotizeFilter_getParamName
_RobotizeFilter_getParamType
_RobotizeFilter_setParams
_Sfxr_create
_Sfxr_destroy
_Sfxr_getLoopPoint
_Sfxr_loadParams
_Sfxr_loadParamsFile
_Sfxr_loadParamsMem
_Sfxr_loadParamsMemEx
_Sfxr_loadPreset
_Sfxr_resetParams
_Sfxr_set3dAttenuation
_Sfxr_set3dAttenuator
_Sfxr_set3dCollider
_Sfxr_set3dColliderEx
_Sfxr_set3dDistanceDelay
_Sfxr_set3dDopplerFactor
_Sfxr_set3dListenerRelative
_Sfxr_set3dMinMaxDistance
_Sfxr_setFilter
_Sfxr_setInaudibleBehavior
_Sfxr_setLoopPoint
_Sfxr_setLooping
_Sfxr_setVolume
_Sfxr_stop
_Soloud_addVoiceToGroup
_Soloud_calcFFT
_Soloud_countAudioSource
_Soloud_create
_Soloud_createVoiceGroup
_Soloud_deinit
_Soloud_destroy
_Soloud_destroyVoiceGroup
_Soloud_fadeFilterParameter
_Soloud_fadeGlobalVolume
_Soloud_fadePan
_Soloud_fadeRelativePlaySpeed
_Soloud_fadeVolume
_Soloud_get3dSoundSpeed
_Soloud_getActiveVoiceCount
_Soloud_getApproximateVolume
_Soloud_getBackendBufferSize
_Soloud_getBackendChannels
_Soloud_getBackendId
_Soloud_getBackendSamplerate
_Soloud_getBackendString
_Soloud_getErrorString
_Soloud_getFilterParameter
_Soloud_getGlobalVolume
_Soloud_getInfo
_Soloud_getLoopCount
_Soloud_getLoopPoint
_Soloud_getLooping
_Soloud_getMaxActiveVoiceCount
_Soloud_getOverallVolume
_Soloud_getPan
_Soloud_getPause
_Soloud_getPostClipScaler
_Soloud_getProtectVoice
_Soloud_getRelativePlaySpeed
_Soloud_getSamplerate
_Soloud_getSpeakerPosition
_Soloud_getStreamPosition
_Soloud_getStreamTime
_Soloud_getVersion
_Soloud_getVoiceCount
_Soloud_getVolume
_Soloud_getWave
_Soloud_init
_Soloud_initEx
_Soloud_isValidVoiceHandle
_Soloud_isVoiceGroup
_Soloud_isVoiceGroupEmpty
_Soloud_mix
_Soloud_mixSigned16
_Soloud_oscillateFilterParameter
_Soloud_oscillateGlobalVolume
_Soloud_oscillatePan
_Soloud_oscillateRelativePlaySpeed
_Soloud_oscillateVolume
_Soloud_play
_Soloud_play3d
_Soloud_play3dClocked
_Soloud_play3dClockedEx
_Soloud_play3dEx
_Soloud_playBackground
_Soloud_playBackgroundEx
_Soloud_playClocked
_Soloud_playClockedEx
_Soloud_playEx
_Soloud_schedulePause
_Soloud_scheduleStop
_Soloud_seek
_Soloud_set3dListenerAt
_Soloud_set3dListenerParameters
_Soloud_set3dListenerParametersEx
_Soloud_set3dListenerPosition
_Soloud_set3dListenerUp
_Soloud_set3dListenerVelocity
_Soloud_set3dSoundSpeed
_Soloud_set3dSourceAttenuation
_Soloud_set3dSourceDopplerFactor
_Soloud_set3dSourceMinMaxDistance
_Soloud_set3dSourceParameters
_Soloud_set3dSourceParametersEx
_Soloud_set3dSourcePosition
_Soloud_set3dSourceVelocity
_Soloud_setDelaySamples
_Soloud_setFilterParameter
_Soloud_setGlobalFilter
_Soloud_setGlobalVolume
_Soloud_setInaudibleBehavior
_Soloud_setLoopPoint
_Soloud_setLooping
_Soloud_setMaxActiveVoiceCount
_Soloud_setPan
_Soloud_setPanAbsolute
_Soloud_setPanAbsoluteEx
_Soloud_setPause
_Soloud_setPauseAll
_Soloud_setPostClipScaler
_Soloud_setProtectVoice
_Soloud_setRelativePlaySpeed
_Soloud_setSamplerate
_Soloud_setSpeakerPosition
_Soloud_setVisualizationEnable
_Soloud_setVolume
_Soloud_stop
_Soloud_stopAll
_Soloud_stopAudioSource
_Soloud_update3dAudio
_Speech_create
_Speech_destroy
_Speech_getLoopPoint
_Speech_set3dAttenuation
_Speech_set3dAttenuator
_Speech_set3dCollider
_Speech_set3dColliderEx
_Speech_set3dDistanceDelay
_Speech_set3dDopplerFactor
_Speech_set3dListenerRelative
_Speech_set3dMinMaxDistance
_Speech_setFilter
_Speech_setInaudibleBehavior
_Speech_setLoopPoint
_Speech_setLooping
_Speech_setParams
_Speech_setParamsEx
_Speech_setText
_Speech_setVolume
_Speech_stop
_TedSid_create
_TedSid_destroy
_TedSid_getLoopPoint
_TedSid_load
_TedSid_loadFile
_TedSid_loadFileToMem
_TedSid_loadMem
_TedSid_loadMemEx
_TedSid_loadToMem
_TedSid_set3dAttenuation
_TedSid_set3dAttenuator
_TedSid_set3dCollider
_TedSid_set3dColliderEx
_TedSid_set3dDistanceDelay
_TedSid_set3dDopplerFactor
_TedSid_set3dListenerRelative
_TedSid_set3dMinMaxDistance
_TedSid_setFilter
_TedSid_setInaudibleBehavior
_TedSid_setLoopPoint
_TedSid_setLooping
_TedSid_setVolume
_TedSid_stop
_Vic_create
_Vic_destroy
_Vic_getLoopPoint
_Vic_getModel
_Vic_getRegister
_Vic_set3dAttenuation
_Vic_set3dAttenuator
_Vic_set3dCollider
_Vic_set3dColliderEx
_Vic_set3dDistanceDelay
_Vic_set3dDopplerFactor
_Vic_set3dListenerRelative
_Vic_set3dMinMaxDistance
_Vic_setFilter
_Vic_setInaudibleBehavior
_Vic_setLoopPoint
_Vic_setLooping
_Vic_setModel
_Vic_setRegister
_Vic_setVolume
_Vic_stop
_Vizsn_create
_Vizsn_destroy
_Vizsn_getLoopPoint
_Vizsn_set3dAttenuation
_Vizsn_set3dAttenuator
_Vizsn_set3dCollider
_Vizsn_set3dColliderEx
_Vizsn_set3dDistanceDelay
_Vizsn_set3dDopplerFactor
_Vizsn_set3dListenerRelative
_Vizsn_set3dMinMaxDistance
_Vizsn_setFilter
_Vizsn_setInaudibleBehavior
_Vizsn_setLoopPoint
_Vizsn_setLooping
_Vizsn_setText
_Vizsn_setVolume
_Vizsn_stop
_WavStream_create
_WavStream_destroy
_WavStream_getLength
_WavStream_getLoopPoint
_WavStream_load
_WavStream_loadFile
_WavStream_loadFileToMem
_WavStream_loadMem
_WavStream_loadMemEx
_WavStream_loadToMem
_WavStream_set3dAttenuation
_WavStream_set3dAttenuator
_WavStream_set3dCollider
_WavStream_set3dColliderEx
_WavStream_set3dDistanceDelay
_WavStream_set3dDopplerFactor
_WavStream_set3dListenerRelative
_WavStream_set3dMinMaxDistance
_WavStream_setFilter
_WavStream_setInaudibleBehavior
_WavStream_setLoopPoint
_WavStream_setLooping
_WavStream_setVolume
_WavStream_stop
_Wav_create
_Wav_destroy
_Wav_getLength
_Wav_getLoopPoint
_Wav_load
_Wav_loadFile
_Wav_loadMem
_Wav_loadMemEx
_Wav_loadRawWave
_Wav_loadRawWave16
_Wav_loadRawWave16Ex
_Wav_loadRawWave8
_Wav_loadRawWave8Ex
_Wav_loadRawWaveEx
_Wav_set3dAttenuation
_Wav_set3dAttenuator
_Wav_set3dCollider
_Wav_set3dColliderEx
_Wav_set3dDistanceDelay
_Wav_set3dDopplerFactor
_Wav_set3dListenerRelative
_Wav_set3dMinMaxDistance
_Wav_setFilter
_Wav_setInaudibleBehavior
_Wav_setLoopPoint
_Wav_setLooping
_Wav_setVolume
_Wav_stop
_WaveShaperFilter_create
_WaveShaperFilter_destroy
_WaveShaperFilter_getParamCount
_WaveShaperFilter_getParamMax
_WaveShaperFilter_getParamMin
_WaveShaperFilter_getParamName
_WaveShaperFilter_getParamType
_WaveShaperFilter_setParams
_memset_pattern16
_Soloud_fft_bitrev_10
_Soloud_fft_bitrev_8
_Soloud_fft_trig_10
_Soloud_fft_trig_8
_Soloud_Filehack_fclose
_Soloud_Filehack_fgetc
_Soloud_Filehack_fopen
_Soloud_Filehack_fopen_s
_Soloud_Filehack_fread
_Soloud_Filehack_fseek
_Soloud_Filehack_ftell
_clock_gettime
_pthread_create
_pthread_join
_pthread_mutex_destroy
_pthread_mutex_init
_pthread_mutex_lock
_pthread_mutex_unlock
_pthread_mutexattr_init

SoLoud version, operating system, backend used, any other potentially useful information:
Version: soloud_20200207.zip <

Operating system: OSX

[bernardbaker]

@jarikomppa hello... Do you have time to look at this?

[konsumer]

I did this on OSX to get wasm (using cmake, which you can install with brew install cmake):

git clone https://github.com/jarikomppa/soloud.git
cd soloud/build
emcmake cmake -DSOLOUD_BACKEND_SDL2=OFF -DSOLOUD_C_API=ON -DSOLOUD_BACKEND_NULL=ON -DSOLOUD_BUILD_DEMOS=ON ../contrib
make

This gives me libsoloud.a, which is a static lib for emscripten. It also builds the demos as wasm.

SoLoud_enumerate.js
SoLoud_enumerate.wasm
SoLoud_null.js
SoLoud_null.wasm
SoLoud_simplest.js
SoLoud_simplest.wasm
SoLoud_welcome.js
SoLoud_welcome.wasm
libsoloud.a

If you want to turn the .a file into a big wasm/js library:

emcc -s LINKABLE=1 -s EXPORT_ALL=1 libsoloud.a -o soloud.js

This exports a ton of random things, so is probably not exactly the right way (would be better to surgically export what you are actually using, from a C file with EMSCRIPTEN_KEEPALIVE instead of EXPORT_ALL.)

[konsumer]

You can also see some 1-off emscripten-builds in demos/emscripten, but it looks like the file-paths are messed up for preloaded assets.

[konsumer]

@ChaseCarlson why 😕 ?

If you have a look here you can see it references ../../bin/graphics/ which should be bin/, but that dir does not exist. It's not in the repo:

find . -name soloud_bg.png

Is it somewhere else?

[konsumer]

Played with it a bunch on my fork and I still can't get the right combo of engine/flags/js to be able to reach into the wasm and play things, but I think it's a start.