make UNAME externally definable

on top of providing a central definition place, which eases maintenance,
it might also help for #1021.

Also : updated doc

Makefile

@@ -109,7 +109,7 @@ cmake:
 endif   # POSIX_ENV
 
 
-ifneq (,$(filter MSYS%,$(shell uname)))
+ifneq (,$(filter MSYS%,$(shell $(UNAME))))
 HOST_OS = MSYS
 CMAKE_PARAMS = -G"MSYS Makefiles"
 endif

Makefile.inc

@@ -30,7 +30,9 @@
 #  - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c
 # ################################################################
 
-TARGET_OS ?= $(shell uname)
+UNAME ?= uname
+
+TARGET_OS ?= $(shell $(UNAME))
 ifeq ($(TARGET_OS),)
   TARGET_OS ?= $(OS)
 endif
@@ -67,7 +69,7 @@ WINDRES    = windres
 endif
 
 #determine if dev/nul based on host environment
-ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell uname)))
+ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell $(UNAME))))
 VOID := /dev/null
 else
   ifneq (,$(filter Windows%,$(OS)))
@@ -77,7 +79,7 @@ VOID  := /dev/null
   endif
 endif
 
-ifneq (,$(filter Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku MidnightBSD MINGW% CYGWIN% MSYS%,$(shell uname)))
+ifneq (,$(filter Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku MidnightBSD MINGW% CYGWIN% MSYS%,$(shell $(UNAME))))
 POSIX_ENV = Yes
 else
 POSIX_ENV = No
@@ -87,7 +89,7 @@ endif
 ifeq ($(WINBASED),yes)
 LN_SF = cp -p
 else
-  ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell uname)))
+  ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell $(UNAME))))
 LN_SF = cp -p
   else
     ifneq (,$(filter Windows%,$(OS)))
@@ -98,7 +100,7 @@ LN_SF  = ln -sf
   endif
 endif
 
-ifneq (,$(filter $(shell uname),SunOS))
+ifneq (,$(filter $(shell $(UNAME)),SunOS))
 INSTALL ?= ginstall
 else
 INSTALL ?= install

doc/lz4_manual.html

@@ -393,7 +393,7 @@ int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
 
 <pre><b></b><p>
  It's possible to have input and output sharing the same buffer,
- for highly contrained memory environments.
+ for highly constrained memory environments.
  In both cases, it requires input to lay at the end of the buffer,
  and decompression to start at beginning of the buffer.
  Buffer size must feature some margin, hence be larger than final size.
@@ -459,7 +459,7 @@ int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
     size_t prefixSize;
 } LZ4_streamDecode_t_internal;
 </b></pre><BR>
-<pre><b>#define LZ4_STREAMSIZE       16416  </b>/* static size, for inter-version compatibility */<b>
+<pre><b>#define LZ4_STREAMSIZE       ((1UL << LZ4_MEMORY_USAGE) + 32)  </b>/* static size, for inter-version compatibility */<b>
 #define LZ4_STREAMSIZE_VOIDP (LZ4_STREAMSIZE / sizeof(void*))
 union LZ4_stream_u {
     void* table[LZ4_STREAMSIZE_VOIDP];

doc/lz4frame_manual.html

@@ -140,7 +140,8 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
  The version provided MUST be LZ4F_VERSION. It is intended to track potential version mismatch, notably when using DLL.
  The function will provide a pointer to a fully allocated LZ4F_cctx object.
  If @return != zero, there was an error during context creation.
- Object can release its memory using LZ4F_freeCompressionContext();
+ Object can be released using LZ4F_freeCompressionContext();
+ Note: LZ4F_freeCompressionContext() works with NULL pointers (do nothing).
  
 </p></pre><BR>
 
@@ -182,8 +183,7 @@ LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
   Important rule: dstCapacity MUST be large enough to ensure operation success even in worst case situations.
   This value is provided by LZ4F_compressBound().
   If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
-  LZ4F_compressUpdate() doesn't guarantee error recovery.
-  When an error occurs, compression context must be freed or resized.
+  After an error, the state is left in a UB state, and must be re-initialized or freed.
  `cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
  @return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
            or an error code if it fails (which can be tested using LZ4F_isError())

programs/Makefile

@@ -55,7 +55,8 @@ CFLAGS   += $(DEBUGFLAGS) $(MOREFLAGS)
 
 include ../Makefile.inc
 
-ifeq ($(TARGET_OS)$(shell uname -r),SunOS5.10)
+OS_VERSION ?= $(UNAME) -r
+ifeq ($(TARGET_OS)$(shell $(OS_VERSION)),SunOS5.10)
 LDFLAGS  += -lrt
 endif
 

tests/Makefile

@@ -145,14 +145,14 @@ checkTag: checkTag.c $(LZ4DIR)/lz4.h
 ifeq ($(POSIX_ENV),Yes)
 
 MD5:=md5sum
-ifneq (,$(filter $(shell uname), Darwin ))
+ifneq (,$(filter $(shell $(UNAME)), Darwin ))
 MD5:=md5 -r
 endif
 
 # note : we should probably settle on a single compare utility
 CMP:=cmp
 DIFF:=diff
-ifneq (,$(filter $(shell uname),SunOS))
+ifneq (,$(filter $(shell $(UNAME)),SunOS))
 DIFF:=gdiff
 endif