update ChangeLog

Bug: webp:627
Change-Id: I67a011b62087a8ad64df3b5eb0a1c051adeea60f

ChangeLog

@@ -1,3 +1,6 @@
+8a6a55bb update NEWS
+cf7c5a5d provide a way to opt-out/override WEBP_NODISCARD
+cc34288a update ChangeLog (tag: v1.4.0-rc1)
 f13c0886 NEWS: fix date
 74555950 Merge "vwebp: fix window title when options are given" into 1.4.0
 d781646c vwebp: fix window title when options are given

NEWS

@@ -1,4 +1,4 @@
-- 4/2/2024: version 1.4.0
+- 4/12/2024: version 1.4.0
   This is a binary compatible release.
   * API changes:
     - libwebpmux: WebPAnimEncoderSetChunk, WebPAnimEncoderGetChunk,
@@ -7,6 +7,8 @@
     - extras: SharpYuvEstimate420Risk
   * further security related hardening in libwebp & examples
   * some minor optimizations in the lossless encoder
+  * added WEBP_NODISCARD to report unused result warnings; enable with
+    -DWEBP_ENABLE_NODISCARD=1
   * improvements and corrections in webp-container-spec.txt and
     webp-lossless-bitstream-spec.txt (#611)
   * miscellaneous warning, bug & build fixes (#615, #619, #632, #635)

src/webp/types.h

@@ -36,8 +36,9 @@ typedef long long int int64_t;
 #define WEBP_INLINE __forceinline
 #endif  /* _MSC_VER */
 
-#if defined(WEBP_ENABLE_NODISCARD) ||                   \
-    (defined(__cplusplus) && __cplusplus >= 201700L) || \
+#ifndef WEBP_NODISCARD
+#if defined(WEBP_ENABLE_NODISCARD) && WEBP_ENABLE_NODISCARD
+#if (defined(__cplusplus) && __cplusplus >= 201700L) || \
     (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
 #define WEBP_NODISCARD [[nodiscard]]
 #else
@@ -47,11 +48,16 @@ typedef long long int int64_t;
 #define WEBP_NODISCARD __attribute__((warn_unused_result))
 #else
 #define WEBP_NODISCARD
-#endif
+#endif  /* __has_attribute(warn_unused_result) */
 #else
 #define WEBP_NODISCARD
-#endif
-#endif
+#endif  /* defined(__clang__) && defined(__has_attribute) */
+#endif  /* (defined(__cplusplus) && __cplusplus >= 201700L) ||
+           (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) */
+#else
+#define WEBP_NODISCARD
+#endif  /* defined(WEBP_ENABLE_NODISCARD) && WEBP_ENABLE_NODISCARD */
+#endif  /* WEBP_NODISCARD */
 
 #ifndef WEBP_EXTERN
 // This explicitly marks library functions and allows for changing the