rustc on linux seems not to export pub extern fns

[flo-l]

I'm on Linux, kernel 3.16.6-203.fc20.x86_64 (64 bit).

[me@localhost test]$ rustc --version
rustc 0.13.0-nightly (b87619e27 2014-11-02 23:27:10 +0000)

test.rs:

fn test(bla: i32) -> i32 { bla*bla }

#[no_mangle]
pub extern "C" fn _test_wrapper(i: i32) -> i32 {
  test(i)
}

[me@localhost test]$ rustc --crate-type dylib test.rs
[me@localhost test]$ nm -g libtest.so 
00000000002014e0 B __bss_start
                 w __cxa_finalize@@GLIBC_2.2.5
00000000002014e0 D _edata
00000000002014e8 B _end
0000000000000808 T _fini
                 w __gmon_start__
00000000000005f0 T _init
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 w _Jv_RegisterClasses
0000000000201030 D rust_metadata_test_7bb26f1eacd843be
                 U rust_stack_exhausted

I hope I haven't made some completely obvious mistake, but I think _test_wrapper should show up under exported symbols.

[alexcrichton]

Hm, the same steps for me have it show up, perhaps something is odd with the local linker/gcc?

$ cat foo.rs
fn test(bla: i32) -> i32 { bla*bla }

#[no_mangle]
pub extern "C" fn _test_wrapper(i: i32) -> i32 {
  test(i)
}
$ rustc --crate-type dylib foo.rs
$ nm -g libfoo.so
00000000000024df A __bss_start
                 w __cxa_finalize
00000000000024df A _edata
00000000000024e4 A _end
00000000000007c8 T _fini
                 w __gmon_start__
00000000000005b0 T _init
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 w _Jv_RegisterClasses
0000000000002020 D rust_metadata_foo_17a5f6ae9433831f
                 U rust_stack_exhausted
0000000000000740 T _test_wrapper
$ rustc -v
rustc 0.13.0-nightly (b87619e27 2014-11-02 23:27:10 +0000)

[flo-l]

Ok I copied your code and it works! ;)

Sorry for the trouble, I probably had a typo or so! Thanks for the fast response!

I'm going to close that issue as it's resolved ;)