- Avoid race conditions caused by exceptions messing with signal masks. (BZ

175270, BZ 175083, maybe BZ 172938).
- Hardcode /bin and /usr/bin paths into gstack (BZ 179829).
- Build in a subdir of the source tree instead of in a sibling directory.
- Switch to versioning scheme that uses the same base revision number for
    all OSes, and uses a suffix to tell the builds apart and ensure
    upgradability.

gdb-6.3-gstack-without-path-20060414.patch

@@ -0,0 +1,33 @@
+Index: gdb-6.3/gdb/gstack.sh
+--- gdb-6.3/gdb/gstack.sh	2006-01-16 16:41:13.000000000 +0000
++++ gdb-6.3/gdb/gstack.sh	2006-02-02 09:22:12.000000000 +0000
+@@ -17,17 +17,17 @@
+ backtrace="bt"
+ if test -d /proc/$1/task ; then
+     # Newer kernel; has a task/ directory.
+-    if test `ls /proc/$1/task | wc -l` -gt 1 2>/dev/null ; then
++    if test `/bin/ls /proc/$1/task | /usr/bin/wc -l` -gt 1 2>/dev/null ; then
+ 	backtrace="thread apply all bt"
+     fi
+ elif test -f /proc/$1/maps ; then
+     # Older kernel; go by it loading libpthread.
+-    if grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
++    if /bin/grep -e libpthread /proc/$1/maps > /dev/null 2>&1 ; then
+ 	backtrace="thread apply all bt"
+     fi
+ fi
+ 
+-GDB=${GDB:-gdb}
++GDB=${GDB:-/usr/bin/gdb}
+ 
+ if $GDB -nx --quiet --batch --readnever > /dev/null 2>&1; then
+     readnever=--readnever
+@@ -39,7 +39,7 @@
+ $GDB --quiet $readnever -nx /proc/$1/exe $1 <<EOF 2>&1 | 
+ $backtrace
+ EOF
+-sed -n \
++/bin/sed -n \
+     -e 's/^(gdb) //' \
+     -e '/^#/p' \
+     -e '/^Thread/p'