perf build failure on Linus's tree

[Greg KH]

Linus's tree right now (3.4.rc5.67.gac001.dirty) gives me the following
build error when I try to build perf:
    CC util/parse-events-flex.o
<stdout>: In function âyy_get_next_bufferâ:
<stdout>:1510:3: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
util/parse-events.l: In function âparse_events_lexâ:
util/parse-events.l:122:1: error: ignoring return value of âfwriteâ, declared with attribute warn_unused_result [-Werror=unused-result]
cc1: all warnings being treated as errors

Do you really want to ensure that flex's build warnings fail the build?

thanks,

greg k-h
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