loosely document supported architectures (#1899)

- add script to generate a table of bins that compile
- add section in README

README.md

@@ -372,6 +372,34 @@ Utilities
 | whoami    |           |        |
 | yes       |           |        |
 
+Targets that compile
+-------
+
+This is an auto-generated table showing which binaries compile for each target-triple. Note that this **does not** indicate that they are fully implemented, or that the tests pass.
+
+|######OS######|###ARCH####|arch|base32|base64|basename|cat|chgrp|chmod|chown|chroot|cksum|comm|cp|csplit|cut|date|df|dircolors|dirname|du|echo|env|expand|expr|factor|false|fmt|fold|groups|hashsum|head|hostid|hostname|id|install|join|kill|link|ln|logname|ls|mkdir|mkfifo|mknod|mktemp|more|mv|nice|nl|nohup|nproc|numfmt|od|paste|pathchk|pinky|printenv|printf|ptx|pwd|readlink|realpath|relpath|rm|rmdir|seq|shred|shuf|sleep|sort|split|stat|stdbuf|sum|sync|tac|tail|tee|test|timeout|touch|tr|true|truncate|tsort|tty|uname|unexpand|uniq|unlink|uptime|users|wc|who|whoami|yes|
+|--------------|-----------|----|------|------|--------|---|-----|-----|-----|------|-----|----|--|------|---|----|--|---------|-------|--|----|---|------|----|------|-----|---|----|------|-------|----|------|--------|--|-------|----|----|----|--|-------|--|-----|------|-----|------|----|--|----|--|-----|-----|------|--|-----|-------|-----|--------|------|---|---|--------|--------|-------|--|-----|---|-----|----|-----|----|-----|----|------|---|----|---|----|---|----|-------|-----|--|----|--------|-----|---|-----|--------|----|------|------|-----|--|---|------|---|
+|linux-gnu|aarch64|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|linux-gnu|i686|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|linux-gnu|powerpc64|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|linux-gnu|riscv64gc| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+|linux-gnu|x86_64|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|windows-msvc|aarch64|y|y|y|y|y| | | | |y|y|y|y|y|y|y|y|y| |y|y|y| |y|y|y|y| |y|y|y|y| | |y| |y|y|y| |y| | |y|y|y| |y| |y|y|y|y| | |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| | |y|y|y|y|y|y| |y|y|y|y|y| |y|y|y| |y| |y| | |y|
+|windows-gnu|i686|y|y|y|y|y| | | | |y|y|y|y|y|y|y|y|y| |y|y|y| |y|y|y|y| |y|y|y|y| | |y| |y|y|y|y|y| | |y|y|y| |y| |y|y|y|y| | |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| | |y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y| |y| |y| |y|y|
+|windows-msvc|i686|y|y|y|y|y| | | | |y|y|y|y|y|y|y|y|y| |y|y|y| |y|y|y|y| |y|y|y|y| | |y| |y|y|y|y|y| | |y|y|y| |y| |y|y|y|y| | |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| | |y|y|y|y|y|y| |y|y|y|y|y| |y|y|y| |y| |y| |y|y|
+|windows-gnu|x86_64|y|y|y|y|y| | | | |y|y|y|y|y|y|y|y|y| |y|y|y| |y|y|y|y| |y|y|y|y| | |y| |y|y|y|y|y| | |y|y|y| |y| |y|y|y|y| | |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| | |y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y| |y| |y| |y|y|
+|windows-msvc|x86_64|y|y|y|y|y| | | | |y|y|y|y|y|y|y|y|y| |y|y|y| |y|y|y|y| |y|y|y|y| | |y| |y|y|y|y|y| | |y|y|y| |y| |y|y|y|y| | |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| | |y|y|y|y|y|y| |y|y|y|y|y| |y|y|y| |y| |y| |y|y|
+|apple MacOS|x86_64|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|freebsd|x86_64|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|
+|netbsd|x86_64|y|y|y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y| |y|y| |y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y| | |y| |y|y|
+|android|aarch64|y|y|y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y| |y|y| |y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| |y|y| |y|y|y|y| |y|y|y|y|y|y| |y|y|y| | |y| |y|y|
+|android|x86_64|y|y|y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y| |y|y|y|y|y|y|y|y|y| |y|y| |y|y|y|y|y|y|y|y|y|y|y|y| |y|y|y|y|y| |y|y|y|y|y|y|y|y|y|y|y|y|y|y|y| |y|y| |y|y|y|y| |y|y|y|y|y|y| |y|y|y| | |y| |y|y|
+|solaris|x86_64| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+|wasi|wasm32| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+|redox|x86_64| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+|fuchsia|aarch64| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+|fuchsia|x86_64| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
+
 License
 -------
 

docs/compiles_table.csv

@@ -0,0 +1,21 @@
+target,arch,base32,base64,basename,cat,chgrp,chmod,chown,chroot,cksum,comm,cp,csplit,cut,date,df,dircolors,dirname,du,echo,env,expand,expr,factor,false,fmt,fold,groups,hashsum,head,hostid,hostname,id,install,join,kill,link,ln,logname,ls,mkdir,mkfifo,mknod,mktemp,more,mv,nice,nl,nohup,nproc,numfmt,od,paste,pathchk,pinky,printenv,printf,ptx,pwd,readlink,realpath,relpath,rm,rmdir,seq,shred,shuf,sleep,sort,split,stat,stdbuf,sum,sync,tac,tail,tee,test,timeout,touch,tr,true,truncate,tsort,tty,uname,unexpand,uniq,unlink,uptime,users,wc,who,whoami,yes
+aarch64-unknown-linux-gnu,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+i686-unknown-linux-gnu,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+powerpc64-unknown-linux-gnu,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+riscv64gc-unknown-linux-gnu,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101
+x86_64-unknown-linux-gnu,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+aarch64-pc-windows-msvc,0,0,0,0,0,101,101,101,101,0,0,0,0,0,0,0,0,0,101,0,0,0,101,0,0,0,0,101,0,0,0,0,101,101,0,101,0,0,0,101,0,101,101,0,0,0,101,0,101,0,0,0,0,101,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,101,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,101,0,101,0,101,101,0
+i686-pc-windows-gnu,0,0,0,0,0,101,101,101,101,0,0,0,0,0,0,0,0,0,101,0,0,0,101,0,0,0,0,101,0,0,0,0,101,101,0,101,0,0,0,0,0,101,101,0,0,0,101,0,101,0,0,0,0,101,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,101,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,101,0,101,0,101,0,0
+i686-pc-windows-msvc,0,0,0,0,0,101,101,101,101,0,0,0,0,0,0,0,0,0,101,0,0,0,101,0,0,0,0,101,0,0,0,0,101,101,0,101,0,0,0,0,0,101,101,0,0,0,101,0,101,0,0,0,0,101,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,101,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,101,0,101,0,101,0,0
+x86_64-pc-windows-gnu,0,0,0,0,0,101,101,101,101,0,0,0,0,0,0,0,0,0,101,0,0,0,101,0,0,0,0,101,0,0,0,0,101,101,0,101,0,0,0,0,0,101,101,0,0,0,101,0,101,0,0,0,0,101,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,101,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,101,0,101,0,101,0,0
+x86_64-pc-windows-msvc,0,0,0,0,0,101,101,101,101,0,0,0,0,0,0,0,0,0,101,0,0,0,101,0,0,0,0,101,0,0,0,0,101,101,0,101,0,0,0,0,0,101,101,0,0,0,101,0,101,0,0,0,0,101,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,101,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,101,0,101,0,101,0,0
+x86_64-apple-darwin,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+x86_64-unknown-freebsd,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+x86_64-unknown-netbsd,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,101,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,101,101,0,101,0,0
+aarch64-linux-android,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,101,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,101,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,101,101,0,101,0,0
+x86_64-linux-android,0,0,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,101,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,0,0,0,101,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,101,0,0,101,0,0,0,0,101,0,0,0,0,0,0,101,0,0,0,101,101,0,101,0,0
+x86_64-sun-solaris,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101
+wasm32-wasi,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101
+x86_64-unknown-redox,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101
+aarch64-fuchsia,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101
+x86_64-fuchsia,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101,101

docs/compiles_table.py

@@ -0,0 +1,234 @@
+#!/usr/bin/env python3
+import multiprocessing
+import subprocess
+import argparse
+import csv
+import sys
+from collections import defaultdict
+from pathlib import Path
+
+# third party dependencies
+from tqdm import tqdm
+
+BINS_PATH=Path("../src/uu")
+CACHE_PATH=Path("compiles_table.csv")
+TARGETS = [
+    # Linux - GNU
+    "aarch64-unknown-linux-gnu",
+    "i686-unknown-linux-gnu",
+    "powerpc64-unknown-linux-gnu",
+    "riscv64gc-unknown-linux-gnu",
+    "x86_64-unknown-linux-gnu",
+    # Windows
+    "aarch64-pc-windows-msvc",
+    "i686-pc-windows-gnu",
+    "i686-pc-windows-msvc",
+    "x86_64-pc-windows-gnu",
+    "x86_64-pc-windows-msvc",
+    # Apple
+    "x86_64-apple-darwin",
+    "aarch64-apple-ios",
+    "x86_64-apple-ios",
+    # BSDs
+    "x86_64-unknown-freebsd",
+    "x86_64-unknown-netbsd",
+    # Android
+    "aarch64-linux-android",
+    "x86_64-linux-android",
+    # Solaris
+    "x86_64-sun-solaris",
+    # WASM
+    "wasm32-wasi",
+    # Redox
+    "x86_64-unknown-redox",
+    # Fuchsia
+    "aarch64-fuchsia",
+    "x86_64-fuchsia",
+]
+
+class Target(str):
+    def __new__(cls, content):
+        obj = super().__new__(cls, content)
+        obj.arch, obj.platfrom, obj.os = Target.parse(content)
+        return obj
+
+    @staticmethod
+    def parse(s):
+        elem = s.split("-")
+        if len(elem) == 2:
+            arch, platform, os = elem[0], "n/a", elem[1]
+        else:
+            arch, platform, os = elem[0], elem[1], "-".join(elem[2:])
+        if os == "ios":
+            os = "apple IOS"
+        if os == "darwin":
+            os = "apple MacOS"
+        return (arch, platform, os)
+
+    @staticmethod
+    def get_heading():
+        return ["OS", "ARCH"]
+
+    def get_row_heading(self):
+        return [self.os, self.arch]
+
+    def requires_nightly(self):
+        return "redox" in self
+
+    # Perform the 'it-compiles' check
+    def check(self, binary):
+        if self.requires_nightly():
+            args = [ "cargo", "+nightly", "check",
+                    "-p", f"uu_{binary}", "--bin", binary,
+                    f"--target={self}"]
+        else:
+            args = ["cargo", "check",
+                    "-p", f"uu_{binary}", "--bin", binary,
+                    f"--target={self}"]
+
+        res = subprocess.run(args, capture_output=True)
+        return res.returncode
+
+    # Validate that the dependencies for running this target are met
+    def is_installed(self):
+        # check IOS sdk is installed, raise exception otherwise
+        if "ios" in self:
+            res = subprocess.run(["which", "xcrun"], capture_output=True)
+            if len(res.stdout) == 0:
+                raise Exception("Error: IOS sdk does not seem to be installed. Please do that manually")
+        if not self.requires_nightly():
+            # check std toolchains are installed
+            toolchains = subprocess.run(["rustup", "target", "list"], capture_output=True)
+            toolchains = toolchains.stdout.decode('utf-8').split("\n")
+            if "installed" not in next(filter(lambda x: self in x, toolchains)):
+                raise Exception(f"Error: the {t} target is not installed. Please do that manually")
+        else:
+            # check nightly toolchains are installed
+            toolchains = subprocess.run(["rustup", "+nightly", "target", "list"], capture_output=True)
+            toolchains = toolchains.stdout.decode('utf-8').split("\n")
+            if "installed" not in next(filter(lambda x: self in x, toolchains)):
+                raise Exception(f"Error: the {t} nightly target is not installed. Please do that manually")
+        return True
+
+def install_targets():
+    cmd = ["rustup", "target", "add"] + TARGETS
+    print(" ".join(cmd))
+    ret = subprocess.run(cmd)
+    assert(ret.returncode == 0)
+
+def get_all_bins():
+    bins = map(lambda x: x.name, BINS_PATH.iterdir())
+    return sorted(list(bins))
+
+def get_targets(selection):
+    if "all" in selection:
+        return list(map(Target, TARGETS))
+    else:
+        # preserve the same order as in TARGETS
+        return list(map(Target, filter(lambda x: x in selection, TARGETS)))
+
+def test_helper(tup):
+    bin, target = tup
+    retcode = target.check(bin)
+    return (target, bin, retcode)
+
+def test_all_targets(targets, bins):
+    pool = multiprocessing.Pool()
+    inputs = [(b, t) for b in bins for t in targets]
+
+    outputs = list(tqdm(pool.imap(test_helper, inputs), total=len(inputs)))
+
+    table = defaultdict(dict)
+    for (t, b, r) in outputs:
+        table[t][b] = r
+    return table
+
+def save_csv(file, table):
+    targets = get_targets(table.keys()) # preserve order in CSV
+    bins = list(list(table.values())[0].keys())
+    with open(file, "w") as csvfile:
+        header = ["target"] + bins
+        writer = csv.DictWriter(csvfile, fieldnames=header)
+        writer.writeheader()
+        for t in targets:
+            d = {"target" : t}
+            d.update(table[t])
+            writer.writerow(d)
+
+def load_csv(file):
+    table = {}
+    cols = []
+    rows = []
+    with open(file, "r") as csvfile:
+        reader = csv.DictReader(csvfile)
+        cols = list(filter(lambda x: x!="target", reader.fieldnames))
+        for row in reader:
+            t = Target(row["target"])
+            rows += [t]
+            del row["target"]
+            table[t] = dict([k, int(v)] for k, v in row.items())
+    return (table, rows, cols)
+
+def merge_tables(old, new):
+    from copy import deepcopy
+    tmp = deepcopy(old)
+    tmp.update(deepcopy(new))
+    return tmp
+
+def render_md(fd, table, headings: str, row_headings: Target):
+    def print_row(lst, lens=[]):
+        lens = lens + [0] * (len(lst) - len(lens))
+        for e, l in zip(lst, lens):
+            fmt = '|{}' if l == 0 else '|{:>%s}' % len(header[0])
+            fd.write(fmt.format(e))
+        fd.write("|\n")
+    def cell_render(target, bin):
+        return "y" if table[target][bin] == 0 else " "
+
+    # add some 'hard' padding to specific columns
+    lens = [
+        max(map(lambda x: len(x.os), row_headings)) + 2,
+        max(map(lambda x: len(x.arch), row_headings)) + 2
+        ]
+    header = Target.get_heading()
+    header[0] = ("{:#^%d}" % lens[0]).format(header[0])
+    header[1] = ("{:#^%d}" % lens[1]).format(header[1])
+
+    header += headings
+    print_row(header)
+    lines = list(map(lambda x: '-'*len(x), header))
+    print_row(lines)
+
+    for t in row_headings:
+        row = list(map(lambda b: cell_render(t, b), headings))
+        row = t.get_row_heading() + row
+        print_row(row)
+
+if __name__ == "__main__":
+    # create the top-level parser
+    parser = argparse.ArgumentParser(prog='compiles_table.py')
+    subparsers = parser.add_subparsers(help='sub-command to execute', required=True, dest="cmd")
+    # create the parser for the "check" command
+    parser_a = subparsers.add_parser('check', help='run cargo check on specified targets and update csv cache')
+    parser_a.add_argument("targets", metavar="TARGET", type=str, nargs='+', choices=["all"]+TARGETS,
+                            help="target-triple to check, as shown by 'rustup target list'")
+    # create the parser for the "render" command
+    parser_b = subparsers.add_parser('render', help='print a markdown table to stdout')
+    parser_b.add_argument("--equidistant", action="store_true",
+                            help="NOT IMPLEMENTED: render each column with an equal width (in plaintext)")
+    args = parser.parse_args()
+
+    if args.cmd == "render":
+        table, targets, bins = load_csv(CACHE_PATH)
+        render_md(sys.stdout, table, bins, targets)
+
+    if args.cmd == "check":
+        targets = get_targets(args.targets)
+        bins = get_all_bins()
+
+        assert(all(map(Target.is_installed, targets)))
+        table = test_all_targets(targets, bins)
+
+        prev_table, _, _ = load_csv(CACHE_PATH)
+        new_table = merge_tables(prev_table, table)
+        save_csv(CACHE_PATH, new_table)