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> binary compatibility with C and C++ libraries and tools >(they say that tail recursion doesn't let you use the C > calling conventions that these tools and

> binary compatibility with C and C++ libraries and tools >(they say that tail recursion doesn't let you use the C > calling conventions that these tools and libraries expect > you to use) I've read variations of this comment about Rust C++ compatibility a few times, but haven't managed to find a source. Any references you could point me to?

kibwen 14y ago
AFAIK there's no plan to support any sort of C++ interop natively in Rust. However, it should work just fine if your C++ code exposes a C-compatible interface. Servo has to be able to call into SpiderMonkey somehow.
- kragen 14y ago
  GCC C++ ABIs are unstable enough that cross-platform C++ libraries usually export a C-compatible interface already.
  - ihnorton 14y ago
    g++ vs itself, or g++ vs msvc? g++ uses Itanium C++ ABI on at least linux/mac/mingw, and the mangling and vtable layouts seem to be the same (I'm very interested in any information to the contrary - though I realize vtables are only part of the story).
    - kragen 14y ago
      Itanic may be an exception, but there have been at least two backwards-incompatible C++ ABI changes in G++ over the years. Casting to superclass in the presence of multiple inheritance and exception handling have been among the changes. Maybe they should change vtables too, I don't know.
- ihnorton 14y ago
  Figured as much - it would be hard to take any language seriously without C interop. But that's a long way from "C++ binary compatibility." I've heard this several times, so I was hoping it might be true.
  - kibwen 14y ago
    I've just learned that one of the Samsungers working on Rust has tentative plans to implement C++ interop in the same fashion as D. http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 In any case, I'm not sure that any official Rust source has ever tried to claim "C++ binary compatibility". Perhaps this language is a result of people misinterpreting the fact that Rust lays out structs in memory in the same fashion as C and C++.
    - ihnorton 14y ago
      Cool, thanks. I had not seen anything official either - just pipe-dreaming that one of those commenters I saw knew something special.
asb 14y ago
Apparently sanxiyn is planning on looking to add support at a similar level to D: http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1

kibwen 14y ago

AFAIK there's no plan to support any sort of C++ interop natively in Rust. However, it should work just fine if your C++ code exposes a C-compatible interface. Servo has to be able to call into SpiderMonkey somehow.

kragen 14y ago
GCC C++ ABIs are unstable enough that cross-platform C++ libraries usually export a C-compatible interface already.
- ihnorton 14y ago
  g++ vs itself, or g++ vs msvc? g++ uses Itanium C++ ABI on at least linux/mac/mingw, and the mangling and vtable layouts seem to be the same (I'm very interested in any information to the contrary - though I realize vtables are only part of the story).
  - kragen 14y ago
    Itanic may be an exception, but there have been at least two backwards-incompatible C++ ABI changes in G++ over the years. Casting to superclass in the presence of multiple inheritance and exception handling have been among the changes. Maybe they should change vtables too, I don't know.
ihnorton 14y ago
Figured as much - it would be hard to take any language seriously without C interop. But that's a long way from "C++ binary compatibility." I've heard this several times, so I was hoping it might be true.
- kibwen 14y ago
  I've just learned that one of the Samsungers working on Rust has tentative plans to implement C++ interop in the same fashion as D. http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 In any case, I'm not sure that any official Rust source has ever tried to claim "C++ binary compatibility". Perhaps this language is a result of people misinterpreting the fact that Rust lays out structs in memory in the same fashion as C and C++.
  - ihnorton 14y ago
    Cool, thanks. I had not seen anything official either - just pipe-dreaming that one of those commenters I saw knew something special.

asb 14y ago

Apparently sanxiyn is planning on looking to add support at a similar level to D: http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1 http://www.reddit.com/r/rust/comments/1c3clf/c_ffi/c9codm1