Apply missing_unsafe_on_extern

Author: ehuss

src/backtrace/libunwind.rs

@@ -170,7 +170,7 @@ mod uw {
     pub type _Unwind_Trace_Fn =
         extern "C" fn(ctx: *mut _Unwind_Context, arg: *mut c_void) -> _Unwind_Reason_Code;
 
-    extern "C" {
+    unsafe extern "C" {
         pub fn _Unwind_Backtrace(
             trace: _Unwind_Trace_Fn,
             trace_argument: *mut c_void,
@@ -188,7 +188,7 @@ mod uw {
             not(all(target_os = "vita", target_arch = "arm")),
             not(all(target_os = "nuttx", target_arch = "arm")),
         ))] {
-            extern "C" {
+            unsafe extern "C" {
                 pub fn _Unwind_GetIP(ctx: *mut _Unwind_Context) -> libc::uintptr_t;
                 pub fn _Unwind_FindEnclosingFunction(pc: *mut c_void) -> *mut c_void;
 
@@ -208,7 +208,7 @@ mod uw {
             // instead of relying on _Unwind_GetCFA.
             #[cfg(all(target_os = "linux", target_arch = "s390x"))]
             pub unsafe fn get_sp(ctx: *mut _Unwind_Context) -> libc::uintptr_t {
-                extern "C" {
+                unsafe extern "C" {
                     pub fn _Unwind_GetGR(ctx: *mut _Unwind_Context, index: libc::c_int) -> libc::uintptr_t;
                 }
                 unsafe { _Unwind_GetGR(ctx, 15) }
@@ -248,7 +248,7 @@ mod uw {
             }
 
             type _Unwind_Word = libc::c_uint;
-            extern "C" {
+            unsafe extern "C" {
                 fn _Unwind_VRS_Get(
                     ctx: *mut _Unwind_Context,
                     klass: _Unwind_VRS_RegClass,

src/backtrace/miri.rs

@@ -2,7 +2,7 @@ use alloc::boxed::Box;
 use alloc::vec::Vec;
 use core::ffi::c_void;
 
-extern "Rust" {
+unsafe extern "Rust" {
     fn miri_backtrace_size(flags: u64) -> usize;
     fn miri_get_backtrace(flags: u64, buf: *mut *mut ());
     fn miri_resolve_frame(ptr: *mut (), flags: u64) -> MiriFrame;

src/print/fuchsia.rs

@@ -3,7 +3,7 @@ use core::mem::{size_of, transmute};
 use core::slice::from_raw_parts;
 use libc::c_char;
 
-extern "C" {
+unsafe extern "C" {
     // dl_iterate_phdr takes a callback that will receive a dl_phdr_info pointer
     // for every DSO that has been linked into the process. dl_iterate_phdr also
     // ensures that the dynamic linker is locked from start to finish of the

src/symbolize/gimli/libs_aix.rs

@@ -11,7 +11,7 @@ use core::mem;
 
 const EXE_IMAGE_BASE: u64 = 0x100000000;
 
-extern "C" {
+unsafe extern "C" {
     #[link_name = "_Errno"]
     fn errno_location() -> *mut c_int;
 }

src/symbolize/gimli/libs_illumos.rs

@@ -26,7 +26,7 @@ struct LinkMap {
 const RTLD_SELF: *const libc::c_void = -3isize as *const libc::c_void;
 const RTLD_DI_LINKMAP: libc::c_int = 2;
 
-extern "C" {
+unsafe extern "C" {
     fn dlinfo(
         handle: *const libc::c_void,
         request: libc::c_int,

src/symbolize/gimli/libs_libnx.rs

@@ -4,7 +4,7 @@ use alloc::vec::Vec;
 // DevkitA64 doesn't natively support debug info, but the build system will
 // place debug info at the path `romfs:/debug_info.elf`.
 pub(super) fn native_libraries() -> Vec<Library> {
-    extern "C" {
+    unsafe extern "C" {
         static __start__: u8;
     }