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Date:	Fri, 13 Jul 2012 12:39:07 +0100
From:	Paul Keir <paul AT codeplay DOT com>
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Subject:	test -f //dot
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Hi,

While running configure on llvm I get a hang on:

...
checking for Graphviz... echo Graphviz
checking for dot...

The configure script has a line starting:
if { test -f "$as_dir/$ac_word$ac_exec_ext" && ...

The problem occurs when $as_dir is /

test -f //dot

...also hangs (at least 15 mins.). I tested it on Linux and another 
cygwin machine, and test returns promptly there.

(I *had* introduced / to the PATH by adding cygwin's install dir to my 
Windows PATH; to ease access to cygwin.bat.)

Thanks,
Paul

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