Libpng 1.6.31rc02 - July 25, 2017

This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version.

Files available for download:

Source files with LF line endings (for Unix/Linux) and with a
"configure" script

   1.6.31rc02.tar.xz (LZMA-compressed, recommended)
   1.6.31rc02.tar.gz

Source files with CRLF line endings (for Windows), without the
"configure" script

   lp1631r02.7z  (LZMA-compressed, recommended)
   lp1631r02.zip

Other information:

   1.6.31rc02-README.txt
   1.6.31rc02-LICENSE.txt
   libpng-1.6.31rc02-*.asc (armored detached GPG signatures)

Changes since the last public release (1.6.30):

Version 1.6.31beta01 [July 5, 2017]
  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).

Version 1.6.31beta02 [July 8, 2017]
  Added instructions for disabling hardware optimizations in INSTALL.
  Added "--enable-hardware-optimizations" configuration flag to enable
    or disable all hardware optimizations with one flag.

Version 1.6.31beta03 [July 9, 2017]
  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.

Version 1.6.31beta04 [July 11, 2017]
  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.

Version 1.6.31beta05 [July 13, 2017]
  Added eXIf chunk support.

Version 1.6.31beta06 [July 17, 2017]
  Added a minimal eXIf chunk (with Orientation and FocalLengthIn35mmFilm
    tags) to pngtest.png.

Version 1.6.31beta07 [July 18, 2017]
  Revised the eXIf chunk in pngtest.png to fix "Bad IFD1 Directory" warning.

Version 1.6.31rc01 [July 19, 2017]
  No changes.

Version 1.6.31rc02 [July 25, 2017]
  Fixed typo in example.c (png_free_image should be png_image_free) (Bug
    report by John Smith)

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