vincent zhangw

Things to remember when compiling/linking C/C++ software

by Angel Leon. March 17, 2015; August 29, 2019.

Include Paths

On the compilation phase, you will usually need to specify the different include paths so that the interfaces (.h, .hpp) which define structs, classes, constans, and functions can be found.

With gcc and llvm include paths are passed with -I/path/to/includes, you can pass as many -I as you need.

In Windows, cl.exe takes include paths with the following syntax: /I"c:\path\to\includes\ you can also pass as many as you need.

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

	#!/bin/bash
	export LANG=C
	#export CC=gcc
	export CC=clang
	export COMPILER_WARNINGS_FATAL=false
	export ALLOW_DOWNLOADS=true
	export HOTSPOT_BUILD_JOBS=8
	export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
	export ALT_BOOTDIR=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
	export ALT_PARALLEL_COMPILE_JOBS=8

	## tsinghua
	cd "$(brew --repo)"
	git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

	cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
	git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

	brew update

	# brew bottles

	Port: 1080

	1. Create a file /YOUR PATH/gitproxy.sh with content:

	#!/bin/sh
	nc -X 5 -x 127.0.0.1:1080 "$@"

	2. Edit your ~/.gitconfig

	# For git://

	# see https://www.topbug.net/blog/2013/04/14/install-and-use-gnu-command-line-tools-in-mac-os-x/

	# core
	brew install coreutils

	# key commands
	brew install binutils
	brew install diffutils
	brew install ed --default-names
	brew install findutils --with-default-names

	import java.time.*;
	import java.time.format.DateTimeFormatter;
	import java.time.format.FormatStyle;
	import java.time.temporal.ChronoUnit;
	import java.time.temporal.TemporalAdjusters;
	import java.util.*;

	import static java.time.temporal.TemporalAdjusters.*;

	public class Java8DateTimeExamples {

	git branch -m old_branch new_branch # Rename branch locally
	git push origin :old_branch # Delete the old branch
	git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote

	private static String convertStringNumber(String stringNumber, Locale locale){
	BigDecimal dec = new BigDecimal(stringNumber);
	int scale = dec.scale();
	String format;
	switch (scale) {
	case 0: format = ",##0"; break;
	case 1: format = ",##0.0"; break;
	case 2: format = ",##0.00"; break;
	case 3: format = ",##0.000"; break;
	case 4: format = ",##0.0000"; break;