[libpng17] Comment that PNG_RELEASE_BUILD has to be 0 or 1; illustrate
usage in contrib/pngminim/*/pngusr.h
diff --git a/contrib/pngminim/decoder/pngusr.h b/contrib/pngminim/decoder/pngusr.h
index cbd7890..a396e5b 100644
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -18,6 +18,7 @@
* affect the API (so are not recorded in pnglibconf.h)
*/
+#define PNG_RELEASE_BUILD 1
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINRDPNGCONF_H */
diff --git a/contrib/pngminim/encoder/pngusr.h b/contrib/pngminim/encoder/pngusr.h
index 997d44f..046c81b 100644
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -18,6 +18,7 @@
* affect the API (so are not recorded in pnglibconf.h)
*/
+#define PNG_RELEASE_BUILD 1
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINWRPNGCONF_H */
diff --git a/contrib/pngminim/preader/pngusr.h b/contrib/pngminim/preader/pngusr.h
index 80db3bb..6e0561e 100644
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -18,6 +18,7 @@
* affect the API (so are not recorded in pnglibconf.h)
*/
+#define PNG_RELEASE_BUILD 1
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINPRDPNGCONF_H */
diff --git a/pngpriv.h b/pngpriv.h
index 8e35c71..138505a 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -338,7 +338,7 @@
* default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
* with either:
*
- * -DPNG_RELEASE_BUILD Turns on the release compile path
+ * -DPNG_RELEASE_BUILD=1 Turns on the release compile path
* -DPNG_RELEASE_BUILD=0 Turns it off
*/
#ifndef PNG_RELEASE_BUILD
