[PATCH] ConfHandler: Improve regexp to fix mis-parsing of += and no whitespace

[Richard Purdie <richard.purdie@linuxfoundation.org>]

If you have:

FOO = "a"
FOO += "b"
FOO+= "c"

The expected result is "a b c" however we were seeing "a b" with the FOO+
variable being assigned the value "c". This isn't the expected result.

We need to make the name part of the variale non-greedy so that any + character
becomes part of the operator. This patch does that. I compared the configuration
in OE-Core before and after the change and only the test case changed.

[YOCTO #3834]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/bitbake/lib/bb/parse/parse_py/ConfHandler.py b/bitbake/lib/bb/parse/parse_py/ConfHandler.py
index b3d10c6..4b62a3a 100644
--- a/bitbake/lib/bb/parse/parse_py/ConfHandler.py
+++ b/bitbake/lib/bb/parse/parse_py/ConfHandler.py
@@ -29,7 +29,7 @@ import logging
 import bb.utils
 from bb.parse import ParseError, resolve_file, ast, logger
 
-__config_regexp__  = re.compile( r"(?P<exp>export\s*)?(?P<var>[a-zA-Z0-9\-~_+.${}/]+)(\[(?P<flag>[a-zA-Z0-9\-_+.]+)\])?\s*((?P<colon>:=)|(?P<lazyques>\?\?=)|(?P<ques>\?=)|(?P<append>\+=)|(?P<prepend>=\+)|(?P<predot>=\.)|(?P<postdot>\.=)|=)\s*(?!'[^']*'[^']*'$)(?!\"[^\"]*\"[^\"]*\"$)(?P<apo>['\"])(?P<value>.*)(?P=apo)$")
+__config_regexp__  = re.compile( r"(?P<exp>export\s*)?(?P<var>[a-zA-Z0-9\-~_+.${}/]+?)(\[(?P<flag>[a-zA-Z0-9\-_+.]+)\])?\s*((?P<colon>:=)|(?P<lazyques>\?\?=)|(?P<ques>\?=)|(?P<append>\+=)|(?P<prepend>=\+)|(?P<predot>=\.)|(?P<postdot>\.=)|=)\s*(?!'[^']*'[^']*'$)(?!\"[^\"]*\"[^\"]*\"$)(?P<apo>['\"])(?P<value>.*)(?P=apo)$")
 __include_regexp__ = re.compile( r"include\s+(.+)" )
 __require_regexp__ = re.compile( r"require\s+(.+)" )
 __export_regexp__ = re.compile( r"export\s+([a-zA-Z0-9\-_+.${}/]+)$" )