From 8cb5f8f1587b95a0e86fa8c2becea0cef8ee0a8b Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@zeitlins.org>
Date: Tue, 4 Feb 2020 22:48:25 +0100
Subject: [PATCH] Avoid -Wundef warnings for PNG_ARM_NEON_IMPLEMENTATION

Define this symbol as 0 instead of leaving it undefined when not using
ARM NEON optimizations.

No real changes, but just avoid a bunch of

"PNG_ARM_NEON_IMPLEMENTATION" is not defined, evaluates to 0 [-Wundef]

warnings when building the library.
---
 pngpriv.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pngpriv.h b/pngpriv.h
index 583c26f9b..d734f9746 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -185,6 +185,8 @@
       /* Use the intrinsics code by default. */
 #     define PNG_ARM_NEON_IMPLEMENTATION 1
 #  endif
+#else /* PNG_ARM_NEON_OPT == 0 */
+#     define PNG_ARM_NEON_IMPLEMENTATION 0
 #endif /* PNG_ARM_NEON_OPT > 0 */
 
 #ifndef PNG_MIPS_MSA_OPT