[rust-dev] Issues linking a static Rust library

Ilya Dmitrichenko errordeveloper at gmail.com
Tue Oct 7 13:31:17 PDT 2014

Sounds like very annoying sort of issue... Have you tried patching
this via a script or manually for the start?

ar x libtreble.a
ar c libtreble.a *.o

Also, the good question to ask how those non-traditional files in a
static library archive are use... I would assume that compilers other
then rustc would not be able to make any use of it whatsoever.

Ilya Dmitrichenko

On 7 October 2014 21:03, Tahia Khan <tahia.khan at gmail.com> wrote:
> Hey all! Rust newbie here. I'm having some problems including a static Rust
> library inside of an Objective-C project on XCode.
> I was looking through rustc source code (specifically /back/link.rs) and I
> saw that rlibs and staticlibs are built very similarly (in fact link_rlib is
> called inside of link_staticlib). According to the comments above the
> link_rlib function in link.rs, non-object "magical files" are tacked onto
> the end of archive files for rlibs/staticlibs. I inspected my staticlib with
> otool and confirmed that there are a bunch of non-object files at the end:
> libtreble.a(r-std-std-4e7c5e5c.0.bytecode.deflate): is not an object file
> libtreble.a(r-rand-rand-4e7c5e5c.0.bytecode.deflate): is not an object file
> libtreble.a(r-sync-sync-4e7c5e5c.0.bytecode.deflate): is not an object file
> libtreble.a(r-rustrt-rustrt-4e7c5e5c.0.bytecode.deflate): is not an object
> file
> libtreble.a(r-collections-collections-4e7c5e5c.0.bytecode.deflate): is not
> an object file
> libtreble.a(r-alloc-alloc-4e7c5e5c.0.bytecode.deflate): is not an object
> file
> libtreble.a(r-libc-libc-4e7c5e5c.0.bytecode.deflate): is not an object file
> libtreble.a(r-unicode-unicode-4e7c5e5c.0.bytecode.deflate): is not an object
> file
> libtreble.a(r-core-core-4e7c5e5c.0.bytecode.deflate): is not an object file
> When I try to build my Xcode project, my build fails with the following
> error:
> ld: in
> [path-to-library]/rust-from-c/libtreble.a(r-std-std-4e7c5e5c.0.bytecode.deflate),
> archive member 'r-std-std-4e7c5e5c.0.bytecode.deflate' with length 999896 is
> not mach-o or llvm bitcode for architecture x86_64
> clang: error: linker command failed with exit code 1 (use -v to see
> invocation)
> It looks like the Xcode linker hits the very first non-object file then
> isn't able to determine the architecture of the archive. Does anyone know if
> there's some way to exclude these non-object files in a staticlib/rlib? Or
> if there's some other way to avoid this build issue with the XCode linker?
> Cheers,
> Tahia
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