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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/52513] gcc-4.7.0-RC-20120302 fails to build for i686-pc-cygwin
Date: Wed, 07 Mar 2012 09:45:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52513

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |i686-pc-cygwin
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2012-03-07
                 CC|                            |davek at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org,
                   |                            |rth at gcc dot gnu.org
               Host|                            |i686-pc-cygwin
     Ever Confirmed|0                           |1
              Build|                            |i686-pc-cygwin

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-07 09:44:34 UTC ---
Probably caused by

2010-11-04  Richard Henderson  <rth@redhat.com>

        * configure.ac (AC_CHECK_HEADERS): Add process.h.
        (checkfuncs): Add dup3, spawnve, spawnvpe; sort the list.
        (AC_CHECK_FUNCS): Add dup3, spawnve, spawnvpe.
        * configure, config.in: Rebuild.
        * pex-unix.c [HAVE_SPAWNVE] (pex_unix_exec_child): New function.
        [HAVE_SPAWNVE] (save_and_install_fd, restore_fd): New functions.

thus 4.6 should be broken as well for you?

Can you check why configure thinks spawnve is available in process.h
(contrary to the warning we see in your snippet)?

What Windows version are you using?