Use extern keyword in slide_hash function definitions.

diff --git a/cpu_features.h b/cpu_features.h
index 4d09646e73d1febf7ffa1da560f05b84584ddfed..ce5f0f7effc5860c8ffd09c6eae3b3f324c459da 100644 (file)
--- a/cpu_features.h
+++ b/cpu_features.h
@@ -172,18 +172,18 @@ extern Pos quick_insert_string_acle(deflate_state *const s, const uint32_t str);
 
 /* slide_hash */
 #ifdef X86_SSE2
-void slide_hash_sse2(deflate_state *s);
+extern void slide_hash_sse2(deflate_state *s);
 #elif defined(ARM_NEON_SLIDEHASH)
-void slide_hash_neon(deflate_state *s);
+extern void slide_hash_neon(deflate_state *s);
 #endif
 #if defined(PPC_VMX_SLIDEHASH)
-void slide_hash_vmx(deflate_state *s);
+extern void slide_hash_vmx(deflate_state *s);
 #endif
 #if defined(POWER8_VSX_SLIDEHASH)
-void slide_hash_power8(deflate_state *s);
+extern void slide_hash_power8(deflate_state *s);
 #endif
 #ifdef X86_AVX2
-void slide_hash_avx2(deflate_state *s);
+extern void slide_hash_avx2(deflate_state *s);
 #endif
 
 /* update_hash */