| #!/bin/bash | |
| # Copyright 2013 The Flutter 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 makes sure that no __OBJC,__image_info section appears in the | |
| # executable file built by the Xcode target that runs the script. If such a | |
| # section appears, the script prints an error message and exits nonzero. | |
| # | |
| # Why is this important? | |
| # | |
| # On 10.5, there's a bug in CFBundlePreflightExecutable that causes it to | |
| # crash when operating in an executable that has not loaded at its default | |
| # address (that is, when it's a position-independent executable with the | |
| # MH_PIE bit set in its mach_header) and the executable has an | |
| # __OBJC,__image_info section. See http://crbug.com/88697. | |
| # | |
| # Chrome's main executables don't use any Objective-C at all, and don't need | |
| # to carry this section around. Not linking them as Objective-C when they | |
| # don't need it anyway saves about 4kB in the linked executable, although most | |
| # of that 4kB is just filled with zeroes. | |
| # | |
| # This script makes sure that nobody goofs and accidentally introduces these | |
| # sections into the main executables. | |
| set -eu | |
| executable="${BUILT_PRODUCTS_DIR}/${EXECUTABLE_PATH}" | |
| if xcrun otool -arch i386 -o "${executable}" | grep -q '^Contents.*section$'; \ | |
| then | |
| echo "${0}: ${executable} has an __OBJC,__image_info section" 2>&1 | |
| exit 1 | |
| fi | |
| if [[ ${PIPESTATUS[0]} -ne 0 ]]; then | |
| echo "${0}: otool failed" 2>&1 | |
| exit 1 | |
| fi | |
| exit 0 |