1. the makefile of clearmake

-
Causes clearmake to ignore any errors during execution of the command. By
default, an error causes clearmake to terminate.

The command-line option -i suppresses termination-on-error for all command
lines.
@
Suppresses display of the command line. By default, clearmake displays each
command line just before executing it.

The command-line option -s suppresses display of all command lines. The -n
option displays commands, but does not execute them.
-@ @-
These two prefixes combine the effect of - and @.

The -k option provides for partial recovery from errors. If an error occurs,
execution of the current target (that is, the set of commands for the current
target) stops, but execution continues on other targets that do not depend on
that target.
The command-line option -s suppresses display of all command lines. The -n
option displays commands, but does not execute them.
2. resued and wink in(其中的图片，很好的说明了什么是wink in)

http://publib.boulder.ibm.com/infocenter/cchelp/v7r0m0/index.jsp?topic=/com.ibm.rational.clearcase.books.cc_build_unix.doc/clearcase_build_concepts.htm
3. clearmake options

http://publib.boulder.ibm.com/infocenter/cchelp/v7r0m0/topic/com.ibm.rational.clearcase.cc_ref.doc/topics/clearmake.htm
4. Setting Up a Parallel Build

http://publib.boulder.ibm.com/infocenter/cchelp/v7r0m0/index.jsp?topic=/com.ibm.rational.clearcase.books.cc_build_windows.doc/setting_up_a_parallel_build.htm