From the upstream NEWS file:
v1.7.5
lz4hc : new high compression mode : levels 10-12 compress more and slower, by Przemyslaw Skibinski
lz4cat : fix : works with relative path (#284) and stdin (#285) (reported by @beiDei8z)
cli : fix minor notification when using -r recursive mode
API : lz4frame : LZ4F_frameBound(0) gives upper bound of *flush() and *End() operations (#290, #280)
doc : markdown version of man page, by Takayuki Matsuoka (#279)
build : Makefile : fix make -jX lib+exe concurrency (#277)
build : cmake : improvements by Michał Górny (#296)
v1.7.4.2
fix : Makefile : release build compatible with PIE and customized compilation directives provided through environment variables (#274, reported by Antoine Martin)
v1.7.4
Improved : much better speed in -mx32 mode
cli : fix : Large file support in 32-bits mode on Mac OS-X
fix : compilation on gcc 4.4 (#272), reported by Antoine Martin
v1.7.3
Changed : moved to versioning; package, cli and library have same version number
Improved: Small decompression speed boost
Improved: Small compression speed improvement on 64-bits systems
Improved: Small compression ratio and speed improvement on small files
Improved: Significant speed boost on ARMv6 and ARMv7
Fix : better ratio on 64-bits big-endian targets
Improved cmake build script, by Evan Nemerson
New liblz4-dll project, by Przemyslaw Skibinki
Makefile: Generates object files (*.o) for faster (re)compilation on low power systems
cli : new : --rm and --help commands
cli : new : preserved file attributes, by Przemyslaw Skibinki
cli : fix : crash on some invalid inputs
cli : fix : -t correctly validates lz4-compressed files, by Nick Terrell
cli : fix : detects and reports fread() errors, thanks to Hiroshi Fujishima report #243
cli : bench : new : -r recursive mode
lz4cat : can cat multiple files in a single command line (#184)
Added : doc/lz4_manual.html, by Przemyslaw Skibinski
Added : dictionary compression and frame decompression examples, by Nick Terrell
Added : Debianization, by Evgeniy Polyakov
Signed-off-by: Darik Horn <dajhorn@vanadac.com>
2e4f0aa862