std: Avoid use of `libc` in portable modules

This commit removes usage of the `libc` crate in "portable" modules like
those at the top level and `sys_common`. Instead common types like `*mut
u8` or `u32` are used instead of `*mut c_void` or `c_int` as well as
switching to platform-specific functions like `sys::strlen` instead of
`libc::strlen`.

2 files changed, 3 insertions, 2 deletions

diff --git a/src/libstd/sys/redox/backtrace/tracing.rs b/src/libstd/sys/redox/backtrace/tracing.rs
index cfeabaddda9..0a174b3c3f5 100644
--- a/src/libstd/sys/redox/backtrace/tracing.rs
+++ b/src/libstd/sys/redox/backtrace/tracing.rs
@@ -96,8 +96,8 @@ extern fn trace_fn(ctx: *mut uw::_Unwind_Context,
 
     if cx.idx < cx.frames.len() {
         cx.frames[cx.idx] = Frame {
-            symbol_addr: symaddr,
-            exact_position: ip,
+            symbol_addr: symaddr as *mut u8,
+            exact_position: ip as *mut u8,
         };
         cx.idx += 1;
     }
diff --git a/src/libstd/sys/redox/mod.rs b/src/libstd/sys/redox/mod.rs
index ca5f6637514..4352b72c307 100644
--- a/src/libstd/sys/redox/mod.rs
+++ b/src/libstd/sys/redox/mod.rs
@@ -12,6 +12,7 @@
 
 use io::{self, ErrorKind};
 
+pub use libc::strlen;
 pub use self::rand::hashmap_random_keys;
 
 pub mod args;