Nicholas Baron Nicholas-Baron

How to try out the new `mold` linker with your CMake C/C++ project

Here is a quick how-to if you want to try out the new (supposedly fast) C/C++ linker https://github.com/rui314/mold

In this document I used Ubuntu-22.04 docker container with

RaspberryPi SDIO

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Using perf:

$ perf record -g binary
$ perf script | stackcollapse-perf.pl | rust-unmangle | flamegraph.pl > flame.svg

NOTE: See @GabrielMajeri's comments below about the -g option.

	// % clang++ $(llvm-config --cxxflags --ldflags --system-libs --libs core) -o hello_world_llvm hello_world_llvm.cpp
	// % ./hello_world_llvm
	// hello world

	#include <llvm/ExecutionEngine/ExecutionEngine.h>
	#include <llvm/ExecutionEngine/GenericValue.h>
	#include <llvm/IR/IRBuilder.h>
	#include <stdio.h>

	using namespace llvm;

	#if 0
	ifneq ($(shell grep -a -h -i microsoft /proc/version),)
	# // For use on Windows (WSL) with cygwinX
	# // Requires xinit, xauth and xhost probably
	# // Start the X11 server with `path\to\cygwin64\bin\run.exe --quote /usr/bin/bash.exe -l -c "cd; exec /usr/bin/startxwin -- +iglx -listen tcp"`
	# // If you get "Authorization required, but no authorization protocol specified"
	# // then try running `DISPLAY=:0.0 xhost +` in the cygwin terminal after
	# // starting the X11 server.
	DISPLAY = "`cat /etc/resolv.conf \| grep nameserver \| awk '{ print $$2 }'`:0.0"
	LIBGLARGS = LIBGL_ALWAYS_INDIRECT=1 LIBGL_ALWAYS_SOFTWARE=1

	#include <sys/ioctl.h>
	#include <stdio.h>
	#include <unistd.h>

	int
	main(void) {
	struct winsize ws;
	ioctl(STDIN_FILENO, TIOCGWINSZ, &ws);

	printf ("lines %d\n", ws.ws_row);

	syntax on " enable syntax highlighting
	set background=dark " we like it dark!
	try \| colorscheme gruvbox \| catch \| endtry " use this awesome theme if possible
	highlight Pmenu ctermbg=black guibg=black \| " fix popup color so it's easier to read
	filetype plugin on " load plugins based on file type
	filetype indent on " load indent settings based on file type
	set shiftwidth=2 " number of spaces to use for indenting
	set softtabstop=2 " number of spaces to use when inserting a tab
	set tabstop=2 " show tabs as 2 spaces
	set expandtab " convert tabs into spaces

	-- Remove the history from
	rm -rf .git

	-- recreate the repos from the current content only
	git init
	git add .
	git commit -m "Initial commit"

	-- push to the github remote repos ensuring you overwrite history
	git remote add origin git@github.com:<YOUR ACCOUNT>/<YOUR REPOS>.git