jart/cosmopolitan 2.1 on GitHub

Cosmopolitan Libc makes C/C++ a build-once run-anywhere language, like Java, except it doesn't need an interpreter or virtual machine. Instead, it reconfigures stock GCC to output a POSIX-approved polyglot format that runs natively on Linux + Mac + Windows + FreeBSD + OpenBSD + NetBSD + BIOS or UEFI with the best possible performance and the tiniest footprint imaginable.

Getting Started

If you use Linux, then you can build Cosmopolitan and its included software from source as follows:

wget https://justine.lol/cosmopolitan/cosmopolitan-2.1.tar.gz
tar xf cosmopolitan-2.1.tar.gz
cd cosmopolitan
build/bootstrap/make.com -j8
o//examples/hello.com

If you're doing your development work on Linux or BSD and you want to bring your own build system, then you need just five files to get started:

wget https://justine.lol/cosmopolitan/cosmopolitan-amalgamation-2.1.zip
unzip cosmopolitan-amalgamation-2.1.zip
printf 'main() { printf("hello world\\n"); }\n' >hello.c
gcc -g -Os -static -nostdlib -nostdinc -fno-pie -no-pie -mno-red-zone -gdwarf-4 \
  -fno-omit-frame-pointer -pg -mnop-mcount -mno-tls-direct-seg-refs \
  -o hello.com.dbg hello.c -fuse-ld=bfd -Wl,-T,ape.lds -Wl,--gc-sections \
  -include cosmopolitan.h crt.o ape-no-modify-self.o cosmopolitan.a
objcopy -S -O binary hello.com.dbg hello.com

Features

Introduce POSIX threads support with locking primitives based on *NSYNC
Add VGA terminal support on bare metal (see examples/vga.c) 3fdb1c1
System call portability is now documented at https://justine.lol/cosmopolitan/functions.html
Add cosmocc and cosmoc++ scripts which can serve as an open source toolchain 6cc9e08
Add lchown(), lchmod(), statvfs(), fstatvfs() 5a632cf
Add sigpending() a849a63
Add getgroups() and setgroups() 4c40c50
Implement inet_pton for AF_INET6 d213a48
The _gc() garbage collector is now thread safe 0e2b1bf
Use OpenBSD qsort() which is faster (quicksort) and secure (heapsort fallback) d861d27
Add notpossible keyword and _npassert() 0c70e89
IPv6 is now polyfilled on non-Linux 0547eab
Introduce MODE=fastbuild and shorthand notation m=fastbuild

Bug Fixes

Upgrade to the latest Chromium Zlib. This improves security and performance 224c12f 775944a
Fix out of bounds read in IP address parser 775944a
APE binaries now work better with BusyBox 0305194
Numerous fixes to bare metal support 3733b43 8569704 e0fabd1
Fix bug where SIG_IGN and SIG_DFL weren't working as advertised on BSDs c5c4dfc
Improve quality of raise(), abort(), and tkill() c5c4dfc
Improve quality of uname(), gethostname(), and getdomainname() b66bd06
Improve quality of clock() 12d9e1e
Improve quality of copy_file_range(), sendfile(), splice(), openpty(), closefrom(), close_range(), fadvise() and posix_fadvise() c7a8cd2 9fa6725
Fix _Thread_local with fork() on Windows bf757c4
Improve zipos path handling 1ef955c
Fix preadv() and pwritev() for old distros 3f49889
Support fcntl(F_DUPFD_CLOEXEC) on more systems 3f49889
Fix POSIX advisory locks on Windows 3f49889
Fix race condition in makedirs() 571c2c3
Fix pledge() thread kill semantics 1ea01fc
Improve open source compatibility b73e35c dbf12c3 55c6297
Make SIG_DFL and SIG_IGN C++ compatible 8cd4248
Discard ignored signals on New Technology 7de2f22
Fix inability to add some signals to mask on NT 5986408
Fix issue with ZipOS file descriptors in MODE=asan 3265324
The virtual memory layout is now more optimized b69f3d2
Repository is now buildable by GCC11

Breaking changes

Underscore added to many non-standard APIs to improve open source compatibility 6f7d0cb
Windows 7 and Vista support has now been moved to our vista branch 134ffee
Add sys_ prefix to unwrapped system calls to improve open source compatibility aab4ee4
Debug symbols now removed from MODE=tiny* builds by default
Removed testonly keyword

Third Party

FreeBSD's o//examples/script.com can record and playback terminal screencasts on five OSes 1ad2f53
NetBSD's sed command is now available in third_party/sed/
The One True Awk is now available in third_party/awk/ and https://justine.lol/awk/

Community

We built an online game (https://ipv4.games/) based on Redbean that handled 600 qps on just 2 vcpu (Loam and https://github.com/shamblesides/turfwar/)
We got Actually Portable Perl 96% passing test suites (G4Vi https://github.com/G4Vi/perl5/blob/cosmo/README.cosmo)
We got Actually Portable Python 3.11.0rc1 passing 96% test suites (ahgamut https://github.com/ahgamut/cpython/tree/cosmo_py311)
We got 176 Actually Portable Rust demo programs to build (ahgamut https://github.com/ahgamut/rust-ape-example)

jart/cosmopolitan 2.1 Cosmopolitan v2.1 on GitHub