[ARM breakage] Same old same old

[MagaTailor]

More fallout from rust-lang/rust#29867

Compiling gfx_device_gl v0.7.0
  /home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:314:21: 314:69 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:314                     target.as_bytes_with_nul().as_ptr() as *const i8);
                                                                                                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:314:21: 314:69 help: run `rustc --explain E0308` to see a detailed explanation
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:328:46: 328:94 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:328                 gl.GetFragDataLocation(name, target.as_bytes_with_nul().as_ptr() as *const i8)
                                                                                                                                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:328:46: 328:94 help: run `rustc --explain E0308` to see a detailed explanation
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/info.rs:145:55: 145:60 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/info.rs:145     mem::transmute(str::from_utf8(ffi::CStr::from_ptr(c_str).to_bytes()).unwrap())
                                                                                                                                                       ^~~~~
/home/odroid/.cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/info.rs:145:55: 145:60 help: run `rustc --explain E0308` to see a detailed explanation

Using nightly rust 1.7 on armv7 Linux.

[kvark]

Thanks for the report!

[MagaTailor]

Hi,

A quick and sufficient fix is to cast every instance to *const _ whereas if you wanted to get rid of the problem altogether here's the latest solution.

[kvark]

@petevine thanks! please consider filing a PR

[MagaTailor]

No prob! You're probably aware of the issue which led to the travis failure. On my local 1.7 from before that change all compiles cleanly.

[andresv]

It fails also with rust-1.6-stable on RPi2:

   Compiling gfx_device_gl v0.7.0
/home/pi/.multirust/toolchains/1.6/cargo/registry/src/github.com-48ad6e4054423464/gfx_device_gl-0.7.0/src/shade.rs:314:21: 314:69 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]

[MagaTailor]

I didn't follow the situation after the PR that'd fixed this issue got reverted.

@andresv Do you mean there's just one error now or you simply pasted a snippet?

[andresv]

I just pasted the first error.

[MagaTailor]

Nope, the patch was made partly redundant in 0.8.0.

I'm going to fix one remaining error and it's good to go.