Add linkage attributes to extern "C" blocks

Author: saethlin

src/ffi_avx2.rs

@@ -33,6 +33,10 @@ pub unsafe fn hash_many<const N: usize>(
 }
 
 pub mod ffi {
+    #[cfg_attr(
+        not(feature = "prefer_intrinsics"),
+        link(name = "blake3_sse2_sse41_avx2_assembly", kind = "static")
+    )]
     extern "C" {
         pub fn blake3_hash_many_avx2(
             inputs: *const *const u8,

src/ffi_avx512.rs

@@ -61,6 +61,10 @@ pub unsafe fn hash_many<const N: usize>(
 }
 
 pub mod ffi {
+    #[cfg_attr(
+        not(feature = "prefer_intrinsics"),
+        link(name = "blake3_avx512_assembly", kind = "static")
+    )]
     extern "C" {
         pub fn blake3_compress_in_place_avx512(
             cv: *mut u32,

src/ffi_neon.rs

@@ -53,6 +53,10 @@ pub extern "C" fn blake3_compress_in_place_portable(
 }
 
 pub mod ffi {
+    #[cfg_attr(
+        not(feature = "prefer_intrinsics"),
+        link(name = "blake3_neon", kind = "static")
+    )]
     extern "C" {
         pub fn blake3_hash_many_neon(
             inputs: *const *const u8,

src/ffi_sse2.rs

@@ -61,6 +61,10 @@ pub unsafe fn hash_many<const N: usize>(
 }
 
 pub mod ffi {
+    #[cfg_attr(
+        not(feature = "prefer_intrinsics"),
+        link(name = "blake3_sse2_sse41_avx2_assembly", kind = "static")
+    )]
     extern "C" {
         pub fn blake3_compress_in_place_sse2(
             cv: *mut u32,

src/ffi_sse41.rs

@@ -61,6 +61,10 @@ pub unsafe fn hash_many<const N: usize>(
 }
 
 pub mod ffi {
+    #[cfg_attr(
+        not(feature = "prefer_intrinsics"),
+        link(name = "blake3_sse2_sse41_avx2_assembly", kind = "static")
+    )]
     extern "C" {
         pub fn blake3_compress_in_place_sse41(
             cv: *mut u32,