https://github.com/dbrgn/rust-cdylibtest

https://github.com/dbrgn/rust-cdylibtest

Last synced: 3 months ago
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• Host: GitHub
• URL: https://github.com/dbrgn/rust-cdylibtest
• Owner: dbrgn
• Created: 2018-02-01T14:32:06.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2018-02-01T15:06:28.000Z (over 8 years ago)
• Last Synced: 2026-01-11T12:59:50.038Z (6 months ago)
• Language: Rust
• Size: 4.88 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
crate a contains two `no_mangle` functions (`make_world` and `print_world`)

crate b depends on a and re-exports those functions, and adds an additional function (`goodbye_world`)

when checking with `objdump`:

    $ objdump -T a/target/debug/liba.so  | grep world

    00000000000030c0 g    DF .text  0000000000000303  Base        print_world

    0000000000002f20 g    DF .text  000000000000019a  Base        make_world

    $ objdump -T b/target/debug/libb.so  | grep world

    00000000000034a0 g    DF .text  0000000000000086  Base        goodbye_world

the `libb.so` file does not expose those symbols.

creating wrapper functions works kind-of (see crate `b2`), but it's quite ugly.

also, for some reason, `test.c` in `b2` segfaults while `test.c` in `a` works fine.

    $ cd b2

    $ cc test.c -L target/debug -l b2 -o test

    $ LD_LIBRARY_PATH=target/debug ./test

    Test start

    From b2 crate:

    Output: Goodbye, world!

    From a crate:

    Segmentation fault (core dumped)