By adding the pthreads flag, will that change the behavior of the generated WASM module? I know that browsers like Chrome have experimental support for webassembly threads, but I'm aiming for a WASM module that works in older versions of Chrome as well.
On Wed, Jul 24, 2019, 2:34 PM Mehdi Sabwat <[email protected]> wrote: > I think it's there, https://reviews.llvm.org/D59625 . The backend seems > to disallow linking with objects that use atomics features and are not > tagged as such. That's how I have understood it. I fixed it in my build > by adding pthread to my CFLAGS. > You don't seem to have CFLAGS so prepending cmake with CFLAGS="-pthread" > should do the trick. > Let us know if it works :) > > On Wednesday, July 24, 2019 at 11:04:29 PM UTC+2, Dylan Staley wrote: >> >> Hello! I recently heard about the new WebAssembly backend, and wanted to >> give it a try to compare against the fastcomp backend. I've successfully >> compiled this project using `latest`, but when I switch to >> `latest-upstream` I get the following issue during linking: >> >> ``` >> wasm-ld: error: 'atomics' feature is used by d1_lib.o, so --shared-memory >> must be used >> wasm-ld: error: Target feature 'atomics' used in d1_lib.o is disallowed >> by ConcurrentScheduler.cpp.o. Use --no-check-features to suppress. >> ``` >> >> The actual command that failed was: >> ``` >> shared:ERROR: '/home/staley_dylan/emsdk/upstream/bin/wasm-ld -o >> /tmp/emscripten_temp_DthpaW/td_wasm.wasm --allow-undefined --import-memory >> --import-table --lto-O0 >> CMakeFiles/td_wasm.dir/td/telegram/td_emscripten.cpp.o libtdjson_static.a >> tdactor/libtdactor.a libtdjson_private.a libtdclient.a libtdcore.a >> tdnet/libtdnet.a ../crypto/lib/libssl.a tddb/libtddb.a tdactor/libtdactor.a >> tdutils/libtdutils.a sqlite/libtdsqlite.a ../crypto/lib/libcrypto.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libz.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libcompiler_rt.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc-wasm.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc++-noexcept.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc++abi.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc-extras.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libdlmalloc.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libpthreads_stub.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libcompiler_rt_wasm.a >> /home/staley_dylan/.emscripten_cache/wasm-obj/libc_rt_wasm.a -mllvm >> -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm >> -disable-lsr --export __wasm_call_ctors --export __data_end --export main >> --export malloc --export free --export setThrew --export __errno_location >> --export htonl --export htons --export ntohs --export >> emscripten_builtin_memalign --export memalign --export _get_environ >> --export strlen --export _get_tzname --export _get_daylight --export >> _get_timezone --export emscripten_builtin_free -z stack-size=5242880 >> --initial-memory=16777216 --no-entry --global-base=1024' failed (1) >> ``` >> >> I assume this is something to do with shared memory support in WASM, but >> I haven't changed the configuration between a successful compile on >> `latest` and this failing one on `latest-upstream`. Does anyone have any >> idea? For reference, I'm trying to compile TdLib ( >> https://github.com/tdlib/td >> <https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Ftdlib%2Ftd&sa=D&sntz=1&usg=AFQjCNGFEkTIBqppIVw0j_ZPWBcfUNRVsw> >> ). >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "emscripten-discuss" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/emscripten-discuss/tdjKEcKXXC8/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/977d6ddf-d05b-40c5-a27d-37094d096252%40googlegroups.com > <https://groups.google.com/d/msgid/emscripten-discuss/977d6ddf-d05b-40c5-a27d-37094d096252%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/CA%2Bu72ZnbstT4XzQs7uMszj5%2BX%2BCoAsZy4ggiBu0ujOt9UwvOuQ%40mail.gmail.com.
