CVS commit: src/usr.bin/make

["Roland Illig" <rillig%netbsd.org@localhost>]

Module Name:    src
Committed By:   rillig
Date:           Sun Apr 11 22:53:46 UTC 2021

Modified Files:
        src/usr.bin/make: str.h var.c

Log Message:
make: improve performance for LazyBuf

The previous O(n^2) time complexity for parsing a long string with many
variable expressions was not meant to last for long.  I had hoped to fix
it within a few minutes, but that will take more time.

For now, make LazyBuf simpler by using a traditional C string for the
expected part instead of a Substring.  This avoids a strlen call per
Var_Parse.

No functional change, only performance.


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/usr.bin/make/str.h
cvs rdiff -u -r1.922 -r1.923 src/usr.bin/make/var.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.