Closed
Description
foo.c:
#include <stdio.h>
void foo() {
puts("Hello, foo()!");
}bar.rs:
#[link(name="foo", kind="static")]
extern {
fn foo();
}
pub fn bar() {
unsafe { foo(); }
}
When I build only a static libfoo.a I get the expected behavior, with foo statically linked into the Rust crate .so.
$ rm -f *.o *.so *.a
$ gcc -Wall -fPIC -c foo.c
$ ar rcs libfoo.a foo.o
$ rustc -v
rustc 0.10-pre (6ae5de0 2014-02-19 12:51:48 -0800)
host: x86_64-unknown-linux-gnu
$ rustc --crate-type dylib bar.rs
$ objdump -d libbar-*.so
...
0000000000000a80 <foo>:
a80: 55 push %rbp
a81: 48 89 e5 mov %rsp,%rbp
a84: 48 8d 3d 22 00 00 00 lea 0x22(%rip),%rdi # aad <_fini+0x9>
a8b: e8 80 fe ff ff callq 910 <puts@plt>
a90: 5d pop %rbp
a91: c3 retq
a92: 90 nop
But when I also have libfoo.so in the same directory, rustc prefers that even though kind="static" is set.
$ gcc -shared -o libfoo.so foo.o
$ file libfoo.*
libfoo.a: current ar archive
libfoo.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked
$ rustc --crate-type dylib bar.rs
$ objdump -d libbar-*.so | grep foo
00000000000008b0 <foo@plt>:
9f6: e8 b5 fe ff ff callq 8b0 <foo@plt>
strace confirms that it looks for both libfoo.so and libfoo.a, in that order, in each directory of the library search path, and it stops when it finds ./libfoo.so.