The thumb* target family (which have newlib libc) are not supported #375
Description
I have embedded hardware without an OS. I build Rust code for it with --target thumbv7em-none-eabi and this thumbv7em-none-eabi.json file:
{
"arch": "arm",
"cpu": "cortex-m4",
"data-layout": "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64",
"disable-redzone": true,
"executables": true,
"llvm-target": "thumbv7em-none-eabi",
"morestack": false,
"os": "none",
"relocation-model": "static",
"target-endian": "little",
"target-pointer-width": "32",
"no-compiler-rt": true,
"pre-link-args": [
"-mcpu=cortex-m4", "-mthumb",
"-Tlayout.ld"
],
"post-link-args": [
"-lm", "-lgcc", "-lnosys"
]
}If I add a Cargo dependency on the libc crate and build with this target, I get many build errors. The first and last are below. The entire thing is at https://gist.github.com/anonymous/780fe74b2ae2834fc9c738dbff60acc0
Compiling libc v0.2.15
error[E0412]: type name `c_char` is undefined or not in scope
--> /home/simon/tmp/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.15/src/lib.rs:153:35
|
153 | pub fn fopen(filename: *const c_char,
| ^^^^^^ undefined or not in scope
|
= help: no candidates by the name of `c_char` found in your project; maybe you misspelled the name or forgot to import an external crate?
// Removed: ~4000 more lines
error[E0204]: the trait `Copy` may not be implemented for this type
--> /home/simon/tmp/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.15/src/macros.rs:44:9
|
44 | impl ::dox::Copy for $i {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ field `rlim_cur` does not implement `Copy`
|
::: /home/simon/tmp/cargo-home/registry/src/github.com-1ecc6299db9ec823/libc-0.2.15/src/lib.rs
|
261 | cfg_if! {
| - in this macro invocation
error: aborting due to 5 previous errors
error: Could not compile `libc`.