c9152b6f14
This change switches c++ exception handling from sjlj to standard dwarf. It's needed because clang for aarch64 doesn't support sjlj. It turns out that libunwind had a bare-metal configuration that made this easy to do. This change gets the new experimental cosmocc -mclang flag in a state of working so well that it can now be used to build all of llamafile and it goes 3x faster in terms of build latency, without trading away any perf. The int_fast16_t and int_fast32_t types are now always defined as 32-bit in the interest of having more abi consistency between cosmocc -mgcc and -mclang mode. |
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|---|---|---|
| .. | ||
| calls | ||
| crt | ||
| dlopen | ||
| elf | ||
| fmt | ||
| integral | ||
| intrin | ||
| irq | ||
| isystem | ||
| log | ||
| mem | ||
| nexgen32e | ||
| nt | ||
| proc | ||
| runtime | ||
| sock | ||
| stdio | ||
| str | ||
| sysv | ||
| testlib | ||
| thread | ||
| tinymath | ||
| vga | ||
| x | ||
| ar.h | ||
| assert.h | ||
| atomic.h | ||
| BUILD.mk | ||
| complex.h | ||
| cosmo.h | ||
| ctype.h | ||
| cxxabi.h | ||
| dce.h | ||
| dos.h | ||
| empty.s | ||
| errno.h | ||
| imag.h | ||
| inttypes.h | ||
| iso646.h | ||
| limits.h | ||
| literal.h | ||
| mach.h | ||
| macho.h | ||
| macros.h | ||
| math.h | ||
| paths.h | ||
| README.md | ||
| serialize.h | ||
| stdalign.h | ||
| stdbool.h | ||
| stdckdint.h | ||
| stdlib.h | ||
| temp.h | ||
| testlib-test.txt | ||
| time.h | ||
| unistd.h | ||
| utime.h | ||
| wctype.h | ||
| zip.h | ||
Cosmopolitan Standard Library
This directory defines static archives defining functions, like
printf(), mmap(), win32, etc. Please note that the Cosmopolitan
build configuration doesn't link any C/C++ library dependencies
by default, so you still have the flexibility to choose the one
provided by your system. If you'd prefer Cosmopolitan, just add
$(LIBC) and $(CRT) to your linker arguments.
Your library is compromised of many bite-sized static archives. We use the checkdeps tool to guarantee that the contents of the archives are organized in a logical way that's easy to use with or without our makefile infrastructure, since there's no cyclic dependencies.
The Cosmopolitan Library exports only the most stable canonical
system calls for all supported operating systems, regardless of
which platform is used for compilation. We polyfill many of the
APIs, e.g. read(), write() so they work consistently everywhere
while other apis, e.g. CreateWindowEx(), might only work on one
platform, in which case they become no-op functions on others.
Cosmopolitan polyfill wrappers will usually use the dollar sign naming convention, so they may be bypassed when necessary. This same convention is used when multiple implementations of string library and other performance-critical function are provided to allow Cosmopolitan to go fast on both old and newer computers.
We take an approach to configuration that relies heavily on the
compiler's dead code elimination pass (libc/dce.h). Most of the
code is written so that, for example, folks not wanting support
for OpenBSD can flip a bit in SUPPORT_VECTOR and that code will
be omitted from the build. The same is true for builds that are
tuned using -march=native which effectively asks the library to
not include runtime support hooks for x86 processors older than
what you use.
Please note that, unlike Cygwin or MinGW, Cosmopolitan does not achieve broad support by bolting on a POSIX emulation layer. We do nothing more than (in most cases) stateless API translations that get you 90% of the way there in a fast lightweight manner. We therefore can't address some of the subtle differences, such as the nuances of absolute paths on Windows. Our approach could be compared to something more along the lines of, "the Russians just used a pencil to write in space", versus spending millions researching a pen like NASA.