/usr/src/gcc-4.6/debian/patches/hurd-fixes.diff is in gcc-4.6-source 4.6.4-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | --- a/src/libgcc/generic-morestack.c.orig 2011-12-19 21:14:52.000000000 +0100
+++ b/src/libgcc/generic-morestack.c 2011-12-19 21:15:35.000000000 +0100
@@ -507,7 +507,7 @@
sigemptyset (&__morestack_initial_sp.mask);
sigfillset (&__morestack_fullmask);
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && defined(__SIGRTMIN)
/* In glibc, the first two real time signals are used by the NPTL
threading library. By taking them out of the set of signals, we
avoiding copying the signal mask in pthread_sigmask. More
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