From ee7e65693c0b7f58404e4f5053e0a521601e3c5b Mon Sep 17 00:00:00 2001
From: Thierry Vignaud <tv@mageia.org>
Date: Tue, 31 Jul 2012 10:36:47 +0000
Subject: shrunk debug packages through using dwz
 (https://fedoraproject.org/wiki/Features/DwarfCompressor)

---
 NEWS              |  3 +++
 build.macros.in   |  2 +-
 find-debuginfo.sh | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index 3a37a51..072a02c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+- shrunk debug packages through using dwz
+  (https://fedoraproject.org/wiki/Features/DwarfCompressor)
+
 Version 1.152 - 27 Jul 2012, by Thierry Vignaud
 - add support for mini debug packages
   (https://fedoraproject.org/wiki/Features/MiniDebugInfo)
diff --git a/build.macros.in b/build.macros.in
index aad0ffe..1992ba1 100644
--- a/build.macros.in
+++ b/build.macros.in
@@ -308,7 +308,7 @@ export CFLAGS="%optflags"; export CXXFLAGS="%optflags"; export RPM_OPT_FLAGS="%o
 %{nil}
 
 %__debug_install_post   \
-   @RPMVENDORDIR@/find-debuginfo.sh %{?_include_minidebuginfo:-m} "%{_builddir}/%{?buildsubdir}"\
+   @RPMVENDORDIR@/find-debuginfo.sh %{?_find_debuginfo_dwz_opts} %{?_include_minidebuginfo:-m} "%{_builddir}/%{?buildsubdir}"\
 %{nil}
 
 
diff --git a/find-debuginfo.sh b/find-debuginfo.sh
index c2bc7df..0feb1c0 100755
--- a/find-debuginfo.sh
+++ b/find-debuginfo.sh
@@ -4,6 +4,8 @@
 #
 # Usage: find-debuginfo.sh [--strict-build-id] [-g] [-r] [-m]
 #	 		   [-o debugfiles.list]
+#			   [--run-dwz] [--dwz-low-mem-die-limit N]
+#			   [--dwz-max-die-limit N]
 #			   [[-l filelist]... [-p 'pattern'] -o debuginfo.list]
 #			   [builddir]
 #
@@ -20,6 +22,10 @@
 # The -p argument is an grep -E -style regexp matching the a file name,
 # and must not use anchors (^ or $).
 #
+# The --run-dwz flag instructs find-debuginfo.sh to run the dwz utility
+# if available, and --dwz-low-mem-die-limit and --dwz-max-die-limit
+# provide detailed limits.  See dwz(1) -l and -L option for details.
+#
 # All file names in switches are relative to builddir (. if not given).
 #
 
@@ -35,6 +41,11 @@ include_minidebug=false
 # Barf on missing build IDs.
 strict=false
 
+# DWZ parameters.
+run_dwz=false
+dwz_low_mem_die_limit=
+dwz_max_die_limit=
+
 BUILDDIR=.
 out=debugfiles.list
 nout=0
@@ -43,6 +54,17 @@ while [ $# -gt 0 ]; do
   --strict-build-id)
     strict=true
     ;;
+  --run-dwz)
+    run_dwz=true
+    ;;
+  --dwz-low-mem-die-limit)
+    dwz_low_mem_die_limit=$2
+    shift
+    ;;
+  --dwz-max-die-limit)
+    dwz_max_die_limit=$2
+    shift
+    ;;
   -g)
     strip_g=true
     ;;
@@ -313,6 +335,37 @@ while read nlinks inum f; do
   fi
 done || exit
 
+# Invoke the DWARF Compressor utility.
+if $run_dwz && type dwz >/dev/null 2>&1 \
+   && [ -d "${RPM_BUILD_ROOT}/usr/lib/debug" ]; then
+  dwz_files="`cd "${RPM_BUILD_ROOT}/usr/lib/debug"; find -type f -name \*.debug`"
+  if [ -n "${dwz_files}" ]; then
+    dwz_multifile_name="${RPM_PACKAGE_NAME}-${RPM_PACKAGE_VERSION}-${RPM_PACKAGE_RELEASE}.${RPM_ARCH}"
+    dwz_multifile_suffix=
+    dwz_multifile_idx=0
+    while [ -f "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz/${dwz_multifile_name}${dwz_multifile_suffix}" ]; do
+      let ++dwz_multifile_idx
+      dwz_multifile_suffix=".${dwz_multifile_idx}"
+    done
+    dwz_multfile_name="${dwz_multifile_name}${dwz_multifile_suffix}"
+    dwz_opts="-h -q -r -m .dwz/${dwz_multifile_name}"
+    mkdir -p "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz"
+    [ -n "${dwz_low_mem_die_limit}" ] \
+      && dwz_opts="${dwz_opts} -l ${dwz_low_mem_die_limit}"
+    [ -n "${dwz_max_die_limit}" ] \
+      && dwz_opts="${dwz_opts} -L ${dwz_max_die_limit}"
+    ( cd "${RPM_BUILD_ROOT}/usr/lib/debug" && dwz $dwz_opts $dwz_files )
+    # Remove .dwz directory if empty
+    rmdir "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz" 2>/dev/null
+    if [ -f "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz/${dwz_multifile_name}" ]; then
+      id="`readelf -Wn "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz/${dwz_multifile_name}" \
+	     2>/dev/null | sed -n 's/^    Build ID: \([0-9a-f]\+\)/\1/p'`"
+      [ -n "$id" ] \
+	&& make_id_link "$id" "/usr/lib/debug/.dwz/${dwz_multifile_name}" .debug
+    fi
+  fi
+fi
+
 # For each symlink whose target has a .debug file,
 # make a .debug symlink to that file.
 find "$RPM_BUILD_ROOT" ! -path "${debugdir}/*" -type l -print |
-- 
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