diff -r 7939e7e0573d -r 1974075aa641 config/cc/gcc.in
--- a/config/cc/gcc.in	Mon May 24 16:34:55 2010 +0200
+++ b/config/cc/gcc.in	Thu Jun 17 21:26:23 2010 +0200
@@ -268,6 +268,18 @@
 
       This will compile crossgcc's libs with -Os.
 
+config CC_GCC_DISABLE_PCH
+    bool
+    prompt "Do not build PCH"
+    default n
+    help
+      Say 'y' here to not use Pre-Compiled Headers in the resulting toolchain.
+      at the expense of speed when compiling C++ code.
+      
+      For some configurations (most notably canadian?), PCH are broken, and
+      need to be disabled.  Please see:
+        http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40974
+
 config CC_PKGVERSION
     string
     prompt "gcc ID string"