From af2e791602ca59a5258b6d0f8f49845213a916a2 Mon Sep 17 00:00:00 2001
From: Jack O'Connor <oconnor663@gmail.com>
Date: Mon, 10 Feb 2020 15:24:10 -0500
Subject: [PATCH] avoid compiling avx512_detected() when the "c_avx512" feature
 is disabled

https://github.com/rust-lang/rust/issues/68905 is currently causing
nightly builds to fail, unless `--no-default-features` is used. This
change means that the default build will succeed, and the failure will
only happen when the "c_avx512" is enabled. The `b3sum` crate will still
fail to build on nightly, because it enables that feature, but most
callers should start succeeding on nightly.
---
 src/platform.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/platform.rs b/src/platform.rs
index abf9d300..b453a6ef 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -252,6 +252,7 @@ impl Platform {
 
 // Note that AVX-512 is divided into multiple featuresets, and we use two of
 // them, F and VL.
+#[cfg(feature = "c_avx512")]
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 #[inline(always)]
 pub fn avx512_detected() -> bool {