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-rw-r--r--src/libstd/sys/common/libunwind.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstd/sys/common/libunwind.rs b/src/libstd/sys/common/libunwind.rs
index 956f6005f1c..3f70afe6ad7 100644
--- a/src/libstd/sys/common/libunwind.rs
+++ b/src/libstd/sys/common/libunwind.rs
@@ -86,6 +86,10 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
 pub const unwinder_private_data_size: usize = 2;
 
+#[cfg(target_arch = "asmjs")]
+// FIXME: Copied from arm. Need to confirm.
+pub const unwinder_private_data_size: usize = 20;
+
 #[repr(C)]
 pub struct _Unwind_Exception {
     pub exception_class: _Unwind_Exception_Class,