build.bat works incorrectly because REM commands have illegal )'s in them

[aoney@…]

The Windows cmd interpreter badly handles )'s in rem statements, *sometimes* (but not always) closing "if" statements they are nested within. Per docs, parens are illegal in rem commands (see technet.microsoft.com/en-us/library/bb490986.aspx).

On my Win7 64bit box, this was causing bootstrap vc12 to go down bizarre paths. One potential fix is to escape the parens, i.e. use ^( and ^) instead of () in comments. I wish I were making this up (sigh).

[aoney@…]

(thanks WikiFormatting). That should be "use caret-openParen and caret-closeParen", since caret is the escape character for batch files.

[Steven Watanabe]

Fixed in ​http://github.com/boostorg/build/commit/23032af425c3940810d5ff22e52475a02632c998