undefined reference to pthread_*

[TimNN]

I'm currently trying to get a minimal example (TimNN/nacl-rust-min) to work but linking fails due to undefined pthread symbols:

error: linking with `/home/logic/tmp/nacl_sdk/pepper_42/toolchain/linux_pnacl/bin/le32-nacl-ld.gold` failed: exit code: 1
note: "/home/logic/tmp/nacl_sdk/pepper_42/toolchain/linux_pnacl/bin/le32-nacl-ld.gold" "--oformat=elf32-i386-nacl" "-plugin=/home/logic/tmp/rust_nacl/lib/rustlib/x86_64-unknown-linux-gnu/lib/LLVMgold.so" "-plugin-opt=emit-llvm" "-nostdlib" "--undef-sym-check" "-static" "--allow-unresolved=memcpy" "--allow-unresolved=memset" "--allow-unresolved=memmove" "--allow-unresolved=setjmp" "--allow-unresolved=longjmp" "--allow-unresolved=__nacl_tp_tls_offset" "--allow-unresolved=__nacl_tp_tdb_offset" "--allow-unresolved=__nacl_get_arch" "--undefined=__pnacl_eh_stack" "--undefined=__pnacl_eh_resume" "--allow-unresolved=__pnacl_eh_type_table" "--allow-unresolved=__pnacl_eh_action_table" "--allow-unresolved=__pnacl_eh_filter_table" "--undefined=main" "--undefined=exit" "--undefined=_exit" "-o" "nacl_rust_min.post-link.bc" "-L" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib" "--start-group" "nacl_rust_min.0.bc" "nacl_rust_min.r-ppapi_stub-ppapi_plugin_main_399d0cf7.o-0.bc" "nacl_rust_min.r-ppapi_stub-plugin_main_irt_21ce9d26.o-1.bc" "nacl_rust_min.r-ppapi_stub-ppapi_plugin_start_8da67623.o-2.bc" "nacl_rust_min.r-ppapi_stub-thread_creator_ccf263e1.o-3.bc" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libcollections-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/librustc_unicode-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/librand-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/liballoc-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/liblibc-d8ace771.rlib" "/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libcore-d8ace771.rlib" "--end-group"
note: /home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_destroy'
/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_unlock'
/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_trywrlock'
/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_wrlock'
/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_tryrdlock'
/home/logic/tmp/rust_nacl/lib/rustlib/le32-unknown-nacl/lib/libstd-d8ace771.rlib: error: undefined reference to 'pthread_rwlock_rdlock'

error: aborting due to previous error

Rust version: rustc 1.2.0-dev (2ab1e7955 2015-05-25) (built 2015-05-25)
Configured with: ./configure --target=le32-unknown-nacl --nacl-cross-path=$NACL_SDK_ROOT --prefix=/home/logic/tmp/rust_nacl --enable-ccache --disable-valgrind-rpass
Nacl SDK version: 42

Note that I did merge rust-lang/rust/master into DiamondLovesYou/rust/master because make install failed otherwise (rust-lang#25699) which worked without conflicts (You can find the result at TimNN/rust/upstream-tracking).

I'm not sure if the issue was caused by my merge or not, but I will try again tomorrow without my merge. (However, seeing as the diff from the merge does not include the word pthread I think it is unlikely that this would fix the problem.

Anyway, thank you for the great work!!!

[DiamondLovesYou]

Hey, could you try another build, but this time using pepper_43 from the nacl_sdk? pthread_rwlock_* functions were a recent addition, though I'm not sure how recent TBH. Also, I've made another merge myself, so be sure to do a pull && checkout before trying.

Let me know how it goes!

[TimNN]

Argh, I didn't even think about the possibility that the pepper version might be the problem.

Anyway, using pepper_43 and the latest version solved the problem and everything is building & running just fine!

[DiamondLovesYou]

Sweet, and I'll update the README.md so others don't experience this!