Emscripten Link静态库错误：wasm蒸汽编译失败：导入“ env.getTempRet0”

Question

There is an error when I tried to link my wasm code with static libraries, Grassroot DICOM library.

First of all, I compile Grassroot DICOM using cmake with external toolchain and cmake found from /1.38.14/cmake/Modules/Platform

using Windows 10 with Visual Studio 2017 and Windows 8.1 SDK.

After compile is done. I got static link files

libgdcmcharls.a
libgdcmCommon.a
libgdcmDICT.a
libgdcmDSED.a
....

Then I linked those files to my code using flag

-L<PATH-to-library>
-lgdcmcharls -lgdcmCommon -lgdcmDICT -lgdcmDSED ...

also use:

-s WASM=1 -s SIDE_MODULE=1 -s EXPORT_ALL=1 

The libraries can link and cannot compile. The errors are

multiprocessing.pool.RemoteTraceback: """ Traceback (most recent call last): File "C:\\Users\\WORK\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 121, in worker result = (True, func(*args, **kwds)) File "C:\\Users\\IwI\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 44, in mapstar return list(map(*args)) File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\tools\\shared.py", line 1363, in extract_archive_contents assert not os.path.dirname(f) AssertionError .

Then I changed the way that I linked to Grassroot DICOM using

-s RUNTIME_LINKED_LIBS=['gdcmcharls.a']
-s RUNTIME_LINKED_LIBS=['gdcmCommon.a']
-s RUNTIME_LINKED_LIBS=['gdcmDICT.a']
-s RUNTIME_LINKED_LIBS=['gdcmDSED.a']
.....

I get the error messages

wasm streaming compile failed: LinkError: Import 'env.getTempRet0' is invalid. Expected type Function

falling back to ArrayBuffer instantiation

and in the console shows this error

LinkError: Import 'env.getTempRet0' is invalid. Expected type Function

Just about my machine. I use Windows10 64-bit and emcc (Emscripten gcc/clang-like replacement) 1.38.14 I serched online but it seems noone faces the same problem as me

Update

now I removed all dynamic link flag and the new problem arises

emcc -std=c++17 -O3 --no-heap-copy -s WASM=1  -s USE_WEBGL2=1 -s FULL_ES3=1 -s ALLOW_MEMORY_GROWTH=1 -o hello.html  -s "EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap']"        libgdcmcharls.bc libgdcmCommon.bc libgdcmDICT.bc libgdcmDSED.bc libgdcmexpat.bc libgdcmIOD.bc libgdcmjpeg12.bc libgdcmjpeg16.bc libgdcmjpeg8.bc libgdcmMEXD.bc libgdcmMSFF.bc libgdcmopenjp2.bc libgdcmzlib.bc libsocketxx.bc main.cpp  -o hello.js

multiprocessing.pool.RemoteTraceback: """

Traceback (most recent call last): File "C:\\Users\\WORK\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 121, in worker result = (True, func(*args, **kwds)) File "C:\\Users\\WORK\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 44, in mapstar return list(map(*args)) File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\tools\\shared.py", line 1364, in extract_archive_contents assert not os.path.dirname(f) AssertionError """

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\emcc.py", line 3092, in sys.exit(run()) File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\emcc.py", line 1699, in run final = shared.Building.link(linker_inputs, DEFAULT_FINAL, force_archive_contents=force_archive_contents, temp_files=misc_temp_files, just_calculate=just_calculate) File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\tools\\shared.py", line 2011, in link Building.read_link_inputs([x for x in files if not x.startswith('-')]) File "C:\\workspace\\emsdk\\emscripten\\1.38.14\\tools\\shared.py", line 1852, in read_link_inputs object_names_in_archives = pool.map(extract_archive_contents, archive_names) File "C:\\Users\\WORK\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 268, in map return self._map_async(func, iterable, mapstar, chunksize).get() File "C:\\Users\\WORK\\AppData\\Local\\Programs\\Python\\Python37-32\\lib\\multiprocessing\\pool.py", line 657, in get raise self._value AssertionError gmake: *** [build] Error 1

It seems the problem that python cannot find the module inside the library files

when I traced where the errors are

They are from Python function called

# This function creates a temporary directory specified by the 'dir' field in
# the returned dictionary. Caller is responsible for cleaning up those files
# after done.
def extract_archive_contents(archive_file):


assert not os.path.dirname(f)  #This line causes the trouble

Answer 1

The correct way to use RUNTIME_LINKED_LIBS option should look like this:

-s RUNTIME_LINKED_LIBS=['gdcmcharls.a', 'gdcmCommon.a', 'gdcmDICT.a', 'gdcmDSED.a']

However, this may not be the solution you want. Because you want statically linking the the libraries, not dynamically.

The correct way to compile them together is just to include them as compile targets. The complete emcc option will look like this:

emcc --other-options-you-use \
     -s WASM=1 \
     gdcmcharls.a \
     gdcmCommon.a \
     gdcmDICT.a \
     gdcmDSED.a \
     your_other_source_files_1.c \
     your_other_source_files_2.cpp \
     -o output.js

Don't use -s SIDE_MODULE=1 flag. This is for dynamic linking. -s EXPORT_ALL=1 is probably not you want neither.