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From: "nico at josuttis dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/54834] bootstrap fails when building libbacktrace
Date: Thu, 01 Nov 2012 10:14:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54834

Nicolai Josuttis <nico at josuttis dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nico at josuttis dot de

--- Comment #7 from Nicolai Josuttis <nico at josuttis dot de> 2012-11-01 10:14:30 UTC ---
I got the same problem when switching from revision 1191942 (Oct 1st, 2012) to
revision 193061 (Nov 1st, 2012).
The effect was that the following files existed in the build tree:
 -rw-r--r-- 1 nico None 10659 Sep 21 10:16 gcc/include/unwind.h
 lrwxrwxrwx 1 nico None    36 Oct  2 00:04 i686-pc-cygwin/libgcc/unwind.h ->
../../../src/libgcc/unwind-generic.h

After removing 
 gcc/include/unwind.h
the problem disappeared.

As you can see, my environment was:
 CygWin under Windows 7 x64
 (i686-pc-cygwin)

Config settings were:
../src/configure \
 --enable-languages=c++ \
 --disable-bootstrap \
 --prefix=/cygdrive/p/gcc/gcc$VERSION \
 --program-suffix=$VERSION \
 --with-gxx-include-dir=/cygdrive/p/gcc/gcc$VERSION-include \
 --disable-lto \
 --disable-sjlj-exceptions \
  2>&1 | tee -a ../make.log