PCH is not being found any more???

[Andrew Pinski]

I think the patch which added --enable-pch made the finding of if PCH  
is there disables PCH for every platform.

 From my config.log in libstdc++:
configure:2838: checking for compiler that seems to compile .gch files
configure:2861:  
/home/gates/pinskia/src/gnu/gcc/src/objdir.linux/gcc/xgcc  
-shared-libgcc -B/home/gates/pinskia/src/gnu/gcc/src/objdir.linux/gcc/  
-nostdinc++   
-L/home/gates/pinskia/src/gnu/gcc/src/objdir.linux/i686-pc-linux-gnu/ 
libstdc++-v3/src  
-L/home/gates/pinskia/src/gnu/gcc/src/objdir.linux/i686-pc-linux-gnu/ 
libstdc++-v3/src/.libs  
-B/home/gates/pinskia/linux/i686-pc-linux-gnu/bin/  
-B/home/gates/pinskia/linux/i686-pc-linux-gnu/lib/ -isystem  
/home/gates/pinskia/linux/i686-pc-linux-gnu/include -isystem  
/home/gates/pinskia/linux/i686-pc-linux-gnu/sys-include -c -Werror  
-Winvalid-pch -Wno-deprecated -x c++-header -O2 -g -O2 conftest.C 1>&5
configure: In function `int main()':
configure:2857: error: `yes' undeclared (first use this function)
configure:2857: error: (Each undeclared identifier is reported only  
once for
    each function it appears in.)
configure: failed program was:
#line 2853 "configure"
#include "confdefs.h"
#include <math.h>

int main() {
  yes(0);
; return 0; }

Thanks,
Andrew Pinski