emcc: warning: USE_PTHREADS is deprecated (prefer the standard -pthread flag). Please open a bug if you have a continuing need for this setting #27960

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1. sbc100 commented on Oct 13, 2026

   

   sbc100

   on Oct 13, 2026

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   Can we maybe find a way to remove the -pthread flag from the PGlite build instead? That seems like a more correct way to go about disabling pthreads.
2. tdrz commented on Oct 13, 2026

   

   tdrz

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   Can we maybe find a way to remove the -pthread flag from the PGlite build instead? That seems like a more correct way to go about disabling pthreads.

   My understanding is that there is no -no-pthread flag: #20720 so unsure if it is doable.

   btw this is the error:

   wasm-ld: error: --shared-memory is disallowed by pg_get_line_shlib.o because it was not compiled with 'atomics' or 'bulk-memory' features.
   emcc: error: '/emsdk/upstream/bin/wasm-ld -o libpq.so -Bstatic --import-memory --shared-memory --strip-debug --export=__wasm_call_ctors --export=_emscripten_tls_init --export-if-defined=__start_em_asm --export-if-defined=__stop_em_asm --export-if-defined=__start_em_lib_deps --export-if-defined=__stop_em_lib_deps --export-if-defined=__start_em_js --export-if-defined=__stop_em_js --export-if-defined=main --export-if-defined=__main_argc_argv --unresolved-symbols=import-dynamic -shared --no-stack-first --whole-archive fe-auth-scram.o fe-cancel.o fe-connect.o fe-exec.o fe-lobj.o fe-misc.o fe-print.o fe-protocol3.o fe-secure.o fe-trace.o legacy-pqsignal.o libpq-events.o pqexpbuffer.o fe-auth.o fe-auth-oauth_shlib.o -L../../../src/port -L../../../src/common -lpgcommon_shlib -lpgport_shlib -L/install/libs/lib -L/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic -L/emsdk/upstream/emscripten/src/lib /emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/pic/crtbegin-mt.o --no-whole-archive -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr' failed (returned 1)
   make[3]: *** [../../../src/Makefile.shlib:275: libpq.so] Error 1
   make[3]: *** Deleting file 'libpq.so'
   
3. sbc100 commented on Oct 13, 2026

   

   sbc100

   on Oct 13, 2026

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   2. My understanding is that there is no -no-pthread flag: #20720 so unsure if it is doable.

   Right, but somebody is explictly adding -pthread to the build? Presumably there is some way to stop them from doing that? I assume its coming from upstream build system?
4. tdrz commented on Oct 13, 2026

   

   tdrz

   on Oct 13, 2026

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   3. > 2. My understanding is that there is no -no-pthread flag: #20720 so unsure if it is doable.

   Right, but somebody is explictly adding `-pthread` to the build?  Presumably there is some way to stop them from doing that?    I assume its coming from upstream build system?
   

   Yes, looking into it!