Can't build binary due to warnings as errors

[gracicot]

I'm getting errors due to a function not being declared inside __environ.c. That function is emscripten_builtin_malloc. It seems that it affect both version 3.1.14 and 3.1.15 for me. Is there a way to fix it or it's a bug inside emscripten? Thank you.

Please include the following in your bug report:

Version of emscripten/emsdk:
Please include the output emcc -v here

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.15 (8b4443a87f5eab5dbb9adb690f9ebed0a9da4bd9)
Copyright (C) 2014 the Emscripten authors (see AUTHORS.txt)
This is free and open source software under the MIT license.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Failing command line in full:
If this is compile or link-time failure please include the full failing command
along with its entire output.

cmake --build --preset dev-emscripten-debug
[7/7] Linking CXX executable src/Debug/myproject.html
FAILED: src/Debug/myproject.html 
: && /Users/myself/Workspace/emsdk/upstream/emscripten/em++ -g --bind -sASSERTIONS=0 -sEVAL_CTORS=0 -sWASM=1 -sUSE_WEBGPU=1 -sNO_EXIT_RUNTIME=1 -sSTRICT=1 --shell-file /Users/myself/Workspace/myproject/build/emscripten/src/platform/emscripten/shell.html -sENVIRONMENT=web -sMINIMAL_RUNTIME=2 -sTEXTDECODER=2 -sABORTING_MALLOC=0 -sALLOW_MEMORY_GROWTH=0 -sSUPPORT_ERRNO=0 -sMALLOC=emmalloc -sNO_FILESYSTEM=1 --output_eol=linux src/CMakeFiles/myproject.dir/Debug/myproject.main.cpp.o -o src/Debug/myproject.html  src/platform/Debug/libplatformd.a  /Users/myself/Workspace/mylib/build/emscripten/Debug/libmylibd.a  src/platform/emscripten/Debug/libplatform-emscriptend.a  /Users/myself/Workspace/anotherlib/build/emscripten/Debug/libanotherlibd.a && :
cache:INFO: generating system library: sysroot/lib/wasm32-emscripten/libc.a... (this will be cached in "/Users/myself/.cache/emscripten/sysroot/lib/wasm32-emscripten/libc.a" for subsequent builds)
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:25:17: error: call to undeclared function 'emscripten_builtin_malloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    __environ = emscripten_builtin_malloc(sizeof(char *) * (environ_count + 1));
                ^
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:25:15: error: incompatible integer to pointer conversion assigning to 'char **' from 'int' [-Werror,-Wint-conversion]
    __environ = emscripten_builtin_malloc(sizeof(char *) * (environ_count + 1));
              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:29:11: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Werror,-Wint-conversion]
    char *environ_buf = emscripten_builtin_malloc(sizeof(char) * environ_buf_size);
          ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 errors generated.
emcc: error: '/Users/myself/Workspace/emsdk/upstream/bin/clang -target wasm32-unknown-emscripten -DEMSCRIPTEN -D__EMSCRIPTEN_major__=3 -D__EMSCRIPTEN_minor__=1 -D__EMSCRIPTEN_tiny__=15 -fignore-exceptions -fno-inline-functions -fvisibility=default -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr -Werror=implicit-function-declaration -Xclang -iwithsysroot/include/SDL --sysroot=/Users/myself/.cache/emscripten/sysroot -Xclang -iwithsysroot/include/compat -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g3 -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c -o /Users/myself/.cache/emscripten/build/libc/__environ.o' failed (returned 1)
Traceback (most recent call last):
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/em++.py", line 14, in <module>
    sys.exit(emcc.run(sys.argv))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc.py", line 1194, in run
    phase_calculate_system_libraries(state, linker_arguments, linker_inputs, newargs)
  File "/nix/store/kd2344ly9cg6akmni2q8n2a1bsn8k0za-python3-3.9.13/lib/python3.9/contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc.py", line 2803, in phase_calculate_system_libraries
    extra_files_to_link += system_libs.calculate(all_linker_inputs, newargs, forced=state.forced_stdlibs)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1956, in calculate
    libs_to_link = get_libs_to_link(args, forced, only_forced)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1898, in get_libs_to_link
    add_library('libc')
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1841, in add_library
    libs_to_link.append((lib.get_link_flag(), need_whole_archive))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 258, in get_link_flag
    fullpath = self.get_path()
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 250, in get_path
    return shared.Cache.get_lib(self.get_filename(), self.build)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/cache.py", line 140, in get_lib
    return self.get(name, *args, **kwargs)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/cache.py", line 167, in get
    creator(str(cachename))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 335, in build
    create_lib(out_filename, self.build_objects(build_dir))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 322, in build_objects
    run_build_commands(commands)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 77, in run_build_commands
    shared.run_multiple_processes(commands, env=clean_env())
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/shared.py", line 218, in run_multiple_processes
    raise Exception('Subprocess %d/%d failed (%s)! (cmdline: %s)' % (idx + 1, len(commands), returncode_to_str(finished_process.returncode), shlex_join(commands[idx])))
Exception: Subprocess 949/999 failed (returned 1)! (cmdline: /Users/myself/Workspace/emsdk/upstream/emscripten/emcc -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c -o /Users/myself/.cache/emscripten/build/libc/__environ.o)
ninja: build stopped: subcommand failed.

Full link command and output with -v appended:
Even for runtime issues it helps a lot if you can include the full link command.
Adding -v to the link command will show all of the sub-commands run which
can help us diagnose your issue.

[1/1] Linking CXX executable src/Debug/myproject.html
FAILED: src/Debug/myproject.html 
: && /Users/myself/Workspace/emsdk/upstream/emscripten/em++ -g --bind -sASSERTIONS=0 -sEVAL_CTORS=0 -sWASM=1 -sUSE_WEBGPU=1 -sNO_EXIT_RUNTIME=1 -sSTRICT=1 --shell-file /Users/myself/Workspace/myproject/build/emscripten/src/platform/emscripten/shell.html -v -sENVIRONMENT=web -sMINIMAL_RUNTIME=2 -sTEXTDECODER=2 -sABORTING_MALLOC=0 -sALLOW_MEMORY_GROWTH=0 -sSUPPORT_ERRNO=0 -sMALLOC=emmalloc -sNO_FILESYSTEM=1 --output_eol=linux src/CMakeFiles/myproject.dir/Debug/myproject.main.cpp.o -o src/Debug/myproject.html  src/platform/Debug/libplatformd.a  /Users/myself/Workspace/mylib/build/emscripten/Debug/libmylibd.a  src/platform/emscripten/Debug/libplatform-emscriptend.a  /Users/myself/Workspace/anotherlib/build/emscripten/Debug/libanotherlibd.a && :
cache:INFO: generating system library: sysroot/lib/wasm32-emscripten/libc.a... (this will be cached in "/Users/myself/.cache/emscripten/sysroot/lib/wasm32-emscripten/libc.a" for subsequent builds)
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/pthread_self.c -o /Users/myself/.cache/emscripten/build/libc/pthread_self.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/pthread_cleanup_push.c -o /Users/myself/.cache/emscripten/build/libc/pthread_cleanup_push.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/pthread_attr_get.c -o /Users/myself/.cache/emscripten/build/libc/pthread_attr_get.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/call_once.c -o /Users/myself/.cache/emscripten/build/libc/call_once.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/tss_create.c -o /Users/myself/.cache/emscripten/build/libc/tss_create.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/tss_delete.c -o /Users/myself/.cache/emscripten/build/libc/tss_delete.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/tss_set.c -o /Users/myself/.cache/emscripten/build/libc/tss_set.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_broadcast.c -o /Users/myself/.cache/emscripten/build/libc/cnd_broadcast.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_destroy.c -o /Users/myself/.cache/emscripten/build/libc/cnd_destroy.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_init.c -o /Users/myself/.cache/emscripten/build/libc/cnd_init.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_signal.c -o /Users/myself/.cache/emscripten/build/libc/cnd_signal.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_timedwait.c -o /Users/myself/.cache/emscripten/build/libc/cnd_timedwait.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/cnd_wait.c -o /Users/myself/.cache/emscripten/build/libc/cnd_wait.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_destroy.c -o /Users/myself/.cache/emscripten/build/libc/mtx_destroy.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_init.c -o /Users/myself/.cache/emscripten/build/libc/mtx_init.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_lock.c -o /Users/myself/.cache/emscripten/build/libc/mtx_lock.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_timedlock.c -o /Users/myself/.cache/emscripten/build/libc/mtx_timedlock.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_trylock.c -o /Users/myself/.cache/emscripten/build/libc/mtx_trylock.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/thread/mtx_unlock.c -o /Users/myself/.cache/emscripten/build/libc/mtx_unlock.o

 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/misc/realpath.c -o /Users/myself/.cache/emscripten/build/libc/realpath.o

[ ....... many more, omitted since github seem to have a limit of size ....... ]


 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/unsetenv.c -o /Users/myself/.cache/emscripten/build/libc/unsetenv.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/sched/sched_yield.c -o /Users/myself/.cache/emscripten/build/libc/sched_yield.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/exit/_Exit.c -o /Users/myself/.cache/emscripten/build/libc/_exit__1.o
 "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc" -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -O2 -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/exit/atexit.c -o /Users/myself/.cache/emscripten/build/libc/atexit.o
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:25:17: error: call to undeclared function 'emscripten_builtin_malloc'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    __environ = emscripten_builtin_malloc(sizeof(char *) * (environ_count + 1));
                ^
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:25:15: error: incompatible integer to pointer conversion assigning to 'char **' from 'int' [-Werror,-Wint-conversion]
    __environ = emscripten_builtin_malloc(sizeof(char *) * (environ_count + 1));
              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c:29:11: error: incompatible integer to pointer conversion initializing 'char *' with an expression of type 'int' [-Werror,-Wint-conversion]
    char *environ_buf = emscripten_builtin_malloc(sizeof(char) * environ_buf_size);
          ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 errors generated.
emcc: error: '/Users/myself/Workspace/emsdk/upstream/bin/clang -target wasm32-unknown-emscripten -DEMSCRIPTEN -D__EMSCRIPTEN_major__=3 -D__EMSCRIPTEN_minor__=1 -D__EMSCRIPTEN_tiny__=15 -fignore-exceptions -fno-inline-functions -fvisibility=default -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr -Werror=implicit-function-declaration -Xclang -iwithsysroot/include/SDL --sysroot=/Users/myself/.cache/emscripten/sysroot -Xclang -iwithsysroot/include/compat -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g3 -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c -o /Users/myself/.cache/emscripten/build/libc/__environ.o' failed (returned 1)
Traceback (most recent call last):
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/em++.py", line 14, in <module>
    sys.exit(emcc.run(sys.argv))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc.py", line 1194, in run
    phase_calculate_system_libraries(state, linker_arguments, linker_inputs, newargs)
  File "/nix/store/kd2344ly9cg6akmni2q8n2a1bsn8k0za-python3-3.9.13/lib/python3.9/contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/emcc.py", line 2803, in phase_calculate_system_libraries
    extra_files_to_link += system_libs.calculate(all_linker_inputs, newargs, forced=state.forced_stdlibs)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1956, in calculate
    libs_to_link = get_libs_to_link(args, forced, only_forced)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1898, in get_libs_to_link
    add_library('libc')
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 1841, in add_library
    libs_to_link.append((lib.get_link_flag(), need_whole_archive))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 258, in get_link_flag
    fullpath = self.get_path()
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 250, in get_path
    return shared.Cache.get_lib(self.get_filename(), self.build)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/cache.py", line 140, in get_lib
    return self.get(name, *args, **kwargs)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/cache.py", line 167, in get
    creator(str(cachename))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 335, in build
    create_lib(out_filename, self.build_objects(build_dir))
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 322, in build_objects
    run_build_commands(commands)
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/system_libs.py", line 77, in run_build_commands
    shared.run_multiple_processes(commands, env=clean_env())
  File "/Users/myself/Workspace/emsdk/upstream/emscripten/tools/shared.py", line 218, in run_multiple_processes
    raise Exception('Subprocess %d/%d failed (%s)! (cmdline: %s)' % (idx + 1, len(commands), returncode_to_str(finished_process.returncode), shlex_join(commands[idx])))
Exception: Subprocess 949/999 failed (returned 1)! (cmdline: /Users/myself/Workspace/emsdk/upstream/emscripten/emcc -O2 -Werror -fno-unroll-loops -std=c99 -D_XOPEN_SOURCE=700 -Wno-unused-result -Os -fno-builtin -Wno-ignored-attributes -Wno-macro-redefined -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-pointer-sign -g -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/internal -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/include -I/Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/pthread -DNDEBUG -c /Users/myself/Workspace/emsdk/upstream/emscripten/system/lib/libc/musl/src/env/__environ.c -o /Users/myself/.cache/emscripten/build/libc/__environ.o)
ninja: build stopped: subcommand failed.

[sbc100]

This is very odd. I can't see why you would see this error but not us/others.

The only thing I can think of is that maybe the emscripten/heap.h in your sysroot is somehow out of day. emscripten/heap.h should define emscripten_builtin_malloc as of #17097.

The other thing that is odd here is that normally emsdk users don't need to ever rebuilt libc because it ships prebuilt with emsdk. However you seem to using an EM_CACHE directory that is in your hope directory. I see /Users/myself/.cache/ being referenced. Do you know how/why this alternative cache is being used? emsdk users normally have a cache that lives in emsdk/upstream/emscripten/cache.

One thing to try is ./emcc --clear-cache or completely deleting /Users/myself/.cache/.

[gracicot]

Clearing the cache seem to have solved the problem.

I was using the cache since I was using emscripten installed in the root filesystem, which was read only. Setting up a cache in the home directory was the solution since emscripten assume the installation directory is writeable (it might not when installed on the system)

I will report an issue to my distribution. Thank you for your time.

[sbc100]

But /Users/myself/Workspace/emsdk/upstream/emscripten/ is not readonly is it?

BTW how to enable your own cache? Are you setting EM_CACHE in the environ? Or overriding the entire config perhaps?

[gracicot]

No, but the other emscripten installed on my system is readonly, hence the need to specify the cache directory.

Edit: Yes, I'm setting EM_CACHE in the environment.

[sbc100]

I see, so one fix is to only set EM_CACHE when using your system emscripten.

They cannot share a cache anyway since they represent different emscripten versions. I think its the sharing of the cache that caused this issue, although emscripten is supposed to detect this and clean it out if it detects a version mismatch.

[gracicot]

Well, I was trying to use the system installed one but I encountered the error. The same error happened with emsdk because of the cache. I'll be using the emsdk for now until my distribution fixes the packaged emscripten.