LZ4 Makefile test

Makefile-version

## Old
##
## LIBVER_MAJOR=`sed -n '/LZ4_VERSION_MAJOR/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`
## LIBVER_MINOR=`sed -n '/LZ4_VERSION_MINOR/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`
## LIBVER_PATCH=`sed -n '/LZ4_VERSION_RELEASE/s/.*\s\+\([0-9]\+\).*/\1/p' < lz4.h`

## New
## 
##   (1) Need 'define ' to match only one line.
##   (2) Use ' ' instead of '\s' for the compatibility. (Perhaps '[:blank:]' is better)
##   (3) Use 'XX*' instead of 'X+' for the compatibility.
## 
LIBVER_MAJOR=`sed -n '/define LZ4_VERSION_MAJOR/s/.* \([0-9][0-9]*\).*/\1/p' < lz4.h`
LIBVER_MINOR=`sed -n '/define LZ4_VERSION_MINOR/s/.* \([0-9][0-9]*\).*/\1/p' < lz4.h`
LIBVER_PATCH=`sed -n '/define LZ4_VERSION_RELEASE/s/.* \([0-9][0-9]*\).*/\1/p' < lz4.h`

LIBVER=$(LIBVER_MAJOR).$(LIBVER_MINOR).$(LIBVER_PATCH)

default:
	@echo $(LIBVER)

• Differences between sed on Mac OSX and other “standard” sed?
• Basic Regular Expressions