File "C:\emsdk-main\upstream\emscripten\tools\cache.py", line 68, in lock acquire_cache_lock(reason)

[Benman2785]

latest emscripten installed today
VS2022 installed today

commands for compiling:

emcmake cmake -S. -Bbuild-em -DCMAKE_BUILD_TYPE=Release
embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image_jpg sdl2_image_png
cmake --build build-em -j $(getconf _NPROCESSORS_ONLN)

File "C:\emsdk-main\upstream\emscripten\tools\cache.py", line 68, in lock
acquire_cache_lock(reason)
File "C:\emsdk-main\upstream\emscripten\tools\cache.py", line 42, in acquire_cache_lock
assert 'EM_CACHE_IS_LOCKED' not in os.environ, f'attempt to lock the cache while a parent process is holding the lock ({reason})'
AssertionError: attempt to lock the cache while a parent process is holding the lock (sysroot\lib\wasm32-emscripten\thinlto\libSDL2.a)

googled it and found same error in 2020 and 2023 -> all said its fixed on windows -> but it isnt

actually first time i didnt use

embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image_jpg sdl2_image_png

but i restarted pc

full log: emsdk-err.log

[sbc100]

Which version of emsdk are you using?

I can't seem to reproduce this running ./embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image_jpg sdl2_image_png locally:

$ ./embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image_jpg sdl2_image_png --force
embuilder:INFO: building sdl2
cache:INFO: deleting cached file: /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2.a
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/libSDL2.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2.a" for subsequent builds)
system_libs:INFO: compiled 118 inputs in 2.18s
cache:INFO:  - ok
embuilder:INFO: ...success. Took (2.31s)
embuilder:INFO: building sdl2_ttf
cache:INFO: deleting cached file: /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_ttf.a
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/libSDL2_ttf.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_ttf.a" for subsequent builds)
system_libs:INFO: compiled 1 inputs in 1.72s
cache:INFO:  - ok
embuilder:INFO: ...success. Took (1.81s)
embuilder:INFO: building sdl2_image
cache:INFO: deleting cached file: /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image.a
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/libSDL2_image.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image.a" for subsequent builds)
system_libs:INFO: compiled 19 inputs in 0.33s
cache:INFO:  - ok
embuilder:INFO: ...success. Took (0.42s)
embuilder:INFO: building sdl2_image_jpg
cache:INFO: deleting cached file: /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image_jpg.a
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/libSDL2_image_jpg.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image_jpg.a" for subsequent builds)
system_libs:INFO: compiled 19 inputs in 0.34s
cache:INFO:  - ok
embuilder:INFO: ...success. Took (0.43s)
embuilder:INFO: building sdl2_image_png
cache:INFO: deleting cached file: /usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image_png.a
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/libSDL2_image_png.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/libSDL2_image_png.a" for subsequent builds)
system_libs:INFO: compiled 19 inputs in 0.39s
cache:INFO:  - ok
embuilder:INFO: ...success. Took (0.49s)
embuilder:INFO: Built 5 targets in (5.48s)

Can you confirm, that that command is that one that fails for you?

[sbc100]

I can reproduce this now:

$ EMCC_CORES=1 ./emcc test/hello_world.c -flto -sUSE_SDL=2 -sUSE_PTHREADS=1 -sUSE_SDL_IMAGE=2 -sSDL2_IMAGE_FORMATS=png
cache:INFO: generating port: sysroot/lib/wasm32-emscripten/lto/libSDL2_image_png.a... (this will be cached in "/usr/local/google/home/sbc/dev/wasm/emscripten/cache/sysroot/lib/wasm32-emscripten/lto/libSDL2_image_png.a" for subsequent builds)
Traceback (most recent call last):
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 1637, in <module>
    sys.exit(main(sys.argv))
             ^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/contextlib.py", line 81, in inner
    return func(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 1630, in main
    ret = run(args)
          ^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 675, in run
    linker_inputs = phase_compile_inputs(options, state, newargs, input_files)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/contextlib.py", line 81, in inner
    return func(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 1039, in phase_compile_inputs
    cmd = get_clang_command() + inputs
          ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 1000, in get_clang_command
    return compiler + get_cflags(state.orig_args, use_cxx) + compile_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/emcc.py", line 464, in get_cflags
    ports.add_cflags(cflags, settings)
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/ports/__init__.py", line 580, in add_cflags
    port.get(Ports, settings, shared)
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/ports/libpng.py", line 49, in get
    return [shared.cache.get_lib(get_lib_name(settings), create, what='port')]
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/cache.py", line 150, in get_lib
    return get(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/cache.py", line 168, in get
    with lock(shortname):
  File "/usr/lib/python3.11/contextlib.py", line 137, in __enter__
    return next(self.gen)
           ^^^^^^^^^^^^^^
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/cache.py", line 68, in lock
    acquire_cache_lock(reason)
  File "/usr/local/google/home/sbc/dev/wasm/emscripten/tools/cache.py", line 42, in acquire_cache_lock
    assert 'EM_CACHE_IS_LOCKED' not in os.environ, f'attempt to lock the cache while a parent process is holding the lock ({reason})'
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: attempt to lock the cache while a parent process is holding the lock (sysroot/lib/wasm32-emscripten/lto/libpng.a)
emcc: error: subprocess 1/19 failed (returned 1)! (cmdline: /usr/local/google/home/sbc/dev/wasm/emscripten/emcc -c /usr/local/google/home/sbc/dev/wasm/emscripten/cache/ports/sdl2_image/SDL_image-release-2.6.0/IMG.c -o /usr/local/google/home/sbc/dev/wasm/emscripten/cache/ports-builds/sdl2_image/IMG.c.o -g -sSTRICT -Werror -flto=full -O2 -I/usr/local/google/home/sbc/dev/wasm/emscripten/cache/ports/sdl2_image/SDL_image-release-2.6.0 -O2 -sUSE_SDL=2 -Wno-format-security -DLOAD_PNG -sUSE_LIBPNG)

[sbc100]

Can you try running ./embuilder build sdl2_image_png --lto. It seems to work as a workaround to build the library up front.

[sbc100]

I think this is essentially the same issue as #20204

[Benman2785]

error persists even with --lto or --lto --force

[sbc100]

A fix is in flight: #22946

[Benman2785]

emscripten_bug.txt

still cant compile :/

[sbc100]

emscripten_bug.txt

still cant compile :/

I'm having trouble replicating. Are you sure you are using the fix from #22946?

[sbc100]

I was able to replicate the your error before #22946 landed but not after so I think maybe you don't have the fix. Did you do emsdk install tot? Can you try running that again to make sure you have the fix?

[Benman2785]

i did: emsdk update && emsdk install latest

will try with install tot

[Benman2785]

emsdk.bat update
emsdk.bat install latest
emsdk.bat install tot
** until here all is fine **
embuilder build sdl2 sdl2_ttf sdl2_image sdl2_image-jpg sdl2_image-png --lto --force
** i need *-jpg & *-png as _ is wrong **
** now i try to compile **
emcmake cmake -S. -Bbuild-em -DCMAKE_BUILD_TYPE=Release
cmake --build build-em -j

still cant compile - but get way further -> now it the untested code of DevilutionX can be the problem -> will look into it when i have more time

thank you :)

[sbc100]

Great news. Glad that old bug is finally fixed.

[Benman2785]

btw - you should also edit your manual: emsdk.bat should NEVER been in an admin CMD :)
because if you use VisualStudio and have installed emscripten via admin cmd there are problems too

[sbc100]

btw - you should also edit your manual: emsdk.bat should NEVER been in an admin CMD :) because if you use VisualStudio and have installed emscripten via admin cmd there are problems too

Perhaps you could elaborate? What kind of problems? Could you perhaps open new bug in the emsdk repo for that?

[Benman2785]

emscripten-core/emsdk#1491