[Bug bootstrap/52513] New: gcc-4.7.0-RC-20120302 fails to build for i686-pc-cygwin

["scovich at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52513

             Bug #: 52513
           Summary: gcc-4.7.0-RC-20120302 fails to build for
                    i686-pc-cygwin
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: scovich@gmail.com


The RC doesn't build on i686-pc-cygwin:

gcc -c -DHAVE_CONFIG_H -g -fkeep-inline-functions  -I.
-I../../gcc-4.7.0-RC-20120302/libiberty/../include  -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -pedantic 
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c -o pex-unix.o
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c: In function
âpex_unix_exec_childâ:
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c:549:2: warning: implicit
declaration of function âspawnvpeâ [-Wimplicit-function-declaration]
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c:549:18: error: â_P_NOWAITOâ
undeclared (first use in this function)
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c:549:18: note: each undeclared
identifier is reported only once for each function it appears in
../../gcc-4.7.0-RC-20120302/libiberty/pex-unix.c:551:2: warning: implicit
declaration of function âspawnveâ [-Wimplicit-function-declaration]
Makefile:892: recipe for target `pex-unix.o' failed
make[3]: *** [pex-unix.o] Error 1
make[3]: Leaving directory `/home/Ryan/apps/gcc-4.7.0-obj/libiberty'
Makefile:8642: recipe for target `all-stage1-libiberty' failed
make[2]: *** [all-stage1-libiberty] Error 2
make[2]: Leaving directory `/home/Ryan/apps/gcc-4.7.0-obj'
Makefile:15771: recipe for target `stage1-bubble' failed
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/Ryan/apps/gcc-4.7.0-obj'
Makefile:897: recipe for target `all' failed
make: *** [all] Error 2

The needed declarations seem to live in Windows headers (process.h?)

This is using all official (and latest) cygwin packages:
binutils-2.22.51
cygwin-1.7.11s(0.259/5/3)
gcc-4.5.3
gmp-4.3.2
make-3.82.90
mpfr-3.0.1

Configure command: ../gcc-4.7.0-RC-20120302/configure
--prefix=$HOME/apps/gcc-4.7 --enable-languages=c,c++,lto