Libpng 1.6.31 - July 27, 2017 This is a public release of libpng, intended for use in production codes. Files available for download: Source files with LF line endings (for Unix/Linux) and with a "configure" script libpng-1.6.31.tar.xz (LZMA-compressed, recommended) libpng-1.6.31.tar.gz Source files with CRLF line endings (for Windows), without the "configure" script lpng1631.7z (LZMA-compressed, recommended) lpng1631.zip Other information: libpng-1.6.31-README.txt libpng-1.6.31-LICENSE.txt libpng-1.6.31-*.asc (armored detached GPG signatures) Changes since the last public release (1.6.30): Guard the definition of _POSIX_SOURCE in pngpriv.h (AIX already defines it; bug report by Michael Felt). Revised pngpriv.h to work around failure to compile arm/filter_neon.S ("typedef" directive is unrecognized by the assembler). The problem was introduced in libpng-1.6.30beta01. Added "Requires: zlib" to libpng.pc.in (Pieter Neerincx). Added special case for FreeBSD in arm/filter_neon.S (Maya Rashish). Added instructions for disabling hardware optimizations in INSTALL. Added "--enable-hardware-optimizations" configuration flag to enable or disable all hardware optimizations with one flag. Updated CMakeLists.txt to add INTEL_SSE and MIPS_MSA platforms. Changed "int" to "png_size_t" in intel/filter_sse2.c to prevent possible integer overflow (Bug report by John Bowler). Quieted "declaration after statement" warnings in intel/filter_sse2.c. Added scripts/makefile-linux-opt, which has hardware optimizations enabled. Removed one of the GCC-7.1.0 'strict-overflow' warnings that result when integers appear on both sides of a compare. Worked around the others by forcing the strict-overflow setting in the relevant functions to a level where they are not reported (John Bowler). Changed "FALL THROUGH" comments to "FALLTHROUGH" because GCC doesn't like the space. Worked around some C-style casts from (void*) because g++ 5.4.0 objects to them. Increased the buffer size for 'sprint' to pass the gcc 7.1.0 'sprint overflow' check that is on by default with -Wall -Wextra. Added eXIf chunk support. Added a minimal eXIf chunk (with Orientation and FocalLengthIn35mmFilm tags) to pngtest.png. Send comments/corrections/commendations to png-mng-implement at lists.sf.net (subscription required; visit https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe) or to glennrp at users.sourceforge.net Glenn R-P