Daniel Beard daniel-beard

Xcode loads xcspec files (ascii plists) that specify everything (tools, buildphases, compilers, rules, etc) based on a set of conditions.

To evaluate these conditions you have to load these files and simulate the build process and construct your own "environment"

The target's build settings will help to resolve most of the environment variables by taking the basics from the particular platform you are using for the target (resolved from the SDKROOT value xcrun --show-sdk-platform-path --sdk)

when you load the spec of the compiler there is a key on it called "Options" which is an array of dictionaries that have

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

New Build System Tricks

Command Line

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild
# THIS DOESNT WORK YET: xcbuild openIDEConsole  # … then switch to Xcode ➡️
xcbuild showSpecs
xcbuild build <foo.pif> [—target <target>]

New Build System Tricks

Command Line

# enable internal menu
defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild

	Add this to the Info.plist:

	<key>NSAppTransportSecurity</key>
	<dict>
	<key>NSAllowsArbitraryLoads</key>
	<true/>
	</dict>

	# The trick is to link the DeviceSupport folder from the beta to the stable version.
	# sudo needed if you run the Mac App Store version. Always download the dmg instead... you'll thank me later :)

	# Support iOS 15 devices (Xcode 13.0) with Xcode 12.5:
	sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/15.0 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

	# Then restart Xcode and reconnect your devices. You will need to do that for every beta of future iOS versions

	# (A similar approach works for older versions too, just change the version number after DeviceSupport)

	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <mach-o/dyld.h>
	#include <mach-o/nlist.h>
	#include <mach-o/dyld_images.h>
	#include <mach/mach_vm.h>

	/* Dyld is the OSX Dynamic Linker
	* /usr/include//mach-o/loader.h

	#!/bin/bash

	CLEAR='\033[0m'
	RED='\033[0;31m'

	function usage() {
	if [ -n "$1" ]; then
	echo -e "${RED}👉 $1${CLEAR}\n";
	fi
	echo "Usage: $0 [-n number-of-people] [-s section-id] [-c cache-file]"

	#! /usr/bin/env stack
	-- stack --resolver lts-18.8 script

	{-# LANGUAGE OverloadedStrings #-}

	{-
	This is a handy illustration of converting between five of the commonly-used
	string types in Haskell (String, ByteString, lazy ByteString, Text and lazy
	Text).

	//
	// main.m
	// EndpointSecurityDemo
	//
	// Created by Omar Ikram on 17/06/2019 - macOS Catalina 10.15 Beta 1 (19A471t)
	// Updated by Omar Ikram on 15/08/2019 - macOS Catalina 10.15 Beta 5 (19A526h)
	// Updated by Omar Ikram on 01/12/2019 - macOS Catalina 10.15 (19A583)
	// Updated by Omar Ikram on 31/01/2021 - macOS Big Sur 11.1 (20C69)
	// Updated by Omar Ikram on 07/05/2021 - macOS Big Sur 11.3.1 (20E241)
	// Updated by Omar Ikram on 04/07/2021 - macOS Monterey 12 Beta 2 (21A5268h)