Reconcile BSD and GNU sed

third_party/libvpx/generate_gypi.sh

 #!/bin/bash -e
 #
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script is used to generate .gypi, .gni files and files in the
 # config/platform directories needed to build libvpx.
 # Every time libvpx source code is updated just run this script.
 #
@@ skipping 440 matching lines @@
   make_clean
   rm -rf vpx_config.*
 }
 
 function update_readme {
   local IFS=$'\n'
   # Split git log output '<date>\n<commit hash>' on the newline to produce 2
   # array entries.
   local vals=($(git --no-pager log -1 --format="%cd%n%H" \
     --date=format:"%A %B %d %Y"))
-  sed -E -i '' \

[jzern, 2016/08/30 23:57:53]

this was my mistake, when testing I think I had the conditions backwards. I had
it correct in an earlier patch, -i'' (no space) should work. Linux reports the
same error with a space between params.

[jzern, 2016/08/31 18:19:09]

I was wrong, abutting it on OSX will consume the next arg '-e' and use that as
the extension

+  sed -E -i.bak \
     -e "s/^(Date:)[[:space:]]+.*$/\1 ${vals[0]}/" \
     -e "s/^(Commit:)[[:space:]]+[a-f0-9]{40}/\1 ${vals[1]}/" \
     ${BASE_DIR}/README.chromium
+  rm ${BASE_DIR}/README.chromium.bak
   cat <<EOF
 
 README.chromium updated with:
 Date: ${vals[0]}
 Commit: ${vals[1]}
 EOF
 }
 
 find_duplicates
 
@@ skipping 136 matching lines @@
 
 gn format --in-place $BASE_DIR/BUILD.gn
 gn format --in-place $BASE_DIR/libvpx_srcs.gni
 
 cd $BASE_DIR/$LIBVPX_SRC_DIR
 update_readme
 
 cd $BASE_DIR
 
 # TODO(fgalligan): Can we turn on "--enable-realtime-only" for mipsel?