Re: find-debuginfo.sh change for gdb index

[Tom Tromey <tromey@redhat.com>]

Roland> So one approach would be to replace the debugedit invocation
Roland> with the use of another shell script.

Here is a patch to just do the work directly in find-debuginfo.sh.  This
seemed simpler to me, but if you and Panu want a new script, I will do
that.

It would perhaps have been cleaner to make the gdb command simply
rewrite the objfile directly.  However, this turns out to be relatively
hairy with BFD.  So again, for simplicity I just stuck with invoking
objcopy directly.  I also verified that objcopy will preserve hard
links.

Tom

--- find-debuginfo.sh.orig	2010-06-29 16:19:42.000000000 -0600
+++ find-debuginfo.sh	2010-07-08 09:36:03.000000000 -0600
@@ -96,6 +96,15 @@
   chmod 444 "$1" || exit
 }
 
+# Create a .gdb-index file for $1.
+make_gdb_index()
+{
+  local f="$1"
+  local d="${f%/*}"
+  # We don't care if gdb gives an error.
+  gdb --batch-silent -ex "file $f" -ex "maintenance save-gdb-index $d" > /dev/null 2>&1
+}
+
 # Make a relative symlink to $1 called $3$2
 shopt -s extglob
 link_relative()
@@ -207,6 +216,12 @@
     $strict && exit 2
   fi
 
+  make_gdb_index "$f"
+  if [ -f "${f}.gdb-index" ]; then
+    objcopy --add-section .gdb_index="${f}.gdb-index" --set-section-flags .gdb_index=readonly "$f" "$f"
+    rm -f "${f}.gdb-index"
+  fi
+
   # A binary already copied into /usr/lib/debug doesn't get stripped,
   # just has its file names collected and adjusted.
   case "$dn" in