From 920cfeace9918c47cdd42214fda545f4a284cded Mon Sep 17 00:00:00 2001
From: Amanieu d'Antras <amanieu@gmail.com>
Date: Fri, 6 Jul 2018 17:41:55 +0100
Subject: [PATCH] Link to libgcc when statically linking musl
---
src/unix/mod.rs | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 15c7821f..6360e156 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -285,6 +285,18 @@ cfg_if! {
// cargo build, don't pull in anything extra as the libstd dep
// already pulls in all libs.
} else if #[cfg(target_env = "musl")] {
+ // On some architectures (e.g. aarch64) musl depends on some libgcc
+ // functions (__addtf3, __multf3, __subtf3) for long double arithmetic
+ // that it uses internally. Unfortunately we don't provide these
+ // functions in compiler-builtins, so we instead need to get them from
+ // libgcc.
+ //
+ // This is not a problem if we are linking to libc dynamically since the
+ // libgcc dependency will automatically get picked up by the linker
+ // then.
+ #[cfg_attr(feature = "stdbuild",
+ link(name = "gcc", kind = "static",
+ cfg(target_feature = "crt-static")))]
#[cfg_attr(feature = "stdbuild",
link(name = "c", kind = "static",
cfg(target_feature = "crt-static")))]
--
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