1 #!/bin/bash 2 3 # Copyright (c) 2011 The Chromium Authors. All rights reserved. 4 # Use of this source code is governed by a BSD-style license that can be 5 # found in the LICENSE file. 6 7 # This script makes sure that no __OBJC,__image_info section appears in the 8 # executable file built by the Xcode target that runs the script. If such a 9 # section appears, the script prints an error message and exits nonzero. 10 # 11 # Why is this important? 12 # 13 # On 10.5, there's a bug in CFBundlePreflightExecutable that causes it to 14 # crash when operating in an executable that has not loaded at its default 15 # address (that is, when it's a position-independent executable with the 16 # MH_PIE bit set in its mach_header) and the executable has an 17 # __OBJC,__image_info section. See http://crbug.com/88697. 18 # 19 # Chrome's main executables don't use any Objective-C at all, and don't need 20 # to carry this section around. Not linking them as Objective-C when they 21 # don't need it anyway saves about 4kB in the linked executable, although most 22 # of that 4kB is just filled with zeroes. 23 # 24 # This script makes sure that nobody goofs and accidentally introduces these 25 # sections into the main executables. 26 27 set -eu 28 29 executable="${BUILT_PRODUCTS_DIR}/${EXECUTABLE_PATH}" 30 31 if xcrun otool -arch i386 -o "${executable}" | grep -q '^Contents.*section$'; \ 32 then 33 echo "${0}: ${executable} has an __OBJC,__image_info section" 2>&1 34 exit 1 35 fi 36 37 if [[ ${PIPESTATUS[0]} -ne 0 ]]; then 38 echo "${0}: otool failed" 2>&1 39 exit 1 40 fi 41 42 exit 0 43
