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-rw-r--r--src/libstd/sys/common/gnu/libbacktrace.rs2
-rw-r--r--src/libstd/sys/common/unwind/gcc.rs3
2 files changed, 4 insertions, 1 deletions
diff --git a/src/libstd/sys/common/gnu/libbacktrace.rs b/src/libstd/sys/common/gnu/libbacktrace.rs
index f8463388384..8b3cb04030c 100644
--- a/src/libstd/sys/common/gnu/libbacktrace.rs
+++ b/src/libstd/sys/common/gnu/libbacktrace.rs
@@ -40,7 +40,7 @@ pub fn print(w: &mut Write, idx: isize, addr: *mut libc::c_void,
                       errnum: libc::c_int);
     enum backtrace_state {}
     #[link(name = "backtrace", kind = "static")]
-    #[cfg(not(test))]
+    #[cfg(all(not(test), not(cargobuild)))]
     extern {}
 
     extern {
diff --git a/src/libstd/sys/common/unwind/gcc.rs b/src/libstd/sys/common/unwind/gcc.rs
index 12cd07a4f4f..7cf9e2a54bd 100644
--- a/src/libstd/sys/common/unwind/gcc.rs
+++ b/src/libstd/sys/common/unwind/gcc.rs
@@ -252,6 +252,9 @@ pub mod eh_frame_registry {
     // See also: rtbegin.rs, `unwind` module.
 
     #[link(name = "gcc_eh")]
+    #[cfg(not(cargobuild))]
+    extern {}
+
     extern {
         fn __register_frame_info(eh_frame_begin: *const u8, object: *mut u8);
         fn __deregister_frame_info(eh_frame_begin: *const u8, object: *mut u8);