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`.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/libstd/sys/unix/backtrace/printing/dladdr.rs b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
index 21f0b3724c1..bc56fd6594e 100644
--- a/src/libstd/sys/unix/backtrace/printing/dladdr.rs
+++ b/src/libstd/sys/unix/backtrace/printing/dladdr.rs
@@ -22,7 +22,7 @@ pub fn resolve_symname<F>(frame: Frame,
 {
     unsafe {
         let mut info: Dl_info = intrinsics::init();
-        let symname = if dladdr(frame.exact_position, &mut info) == 0 ||
+        let symname = if dladdr(frame.exact_position as *mut _, &mut info) == 0 ||
                          info.dli_sname.is_null() {
             None
         } else {
@@ -41,6 +41,5 @@ struct Dl_info {
 }
 
 extern {
-    fn dladdr(addr: *const libc::c_void,
-              info: *mut Dl_info) -> libc::c_int;
+    fn dladdr(addr: *const libc::c_void, info: *mut Dl_info) -> libc::c_int;
 }