This modifies the build process of Zig to put all of the source files
into libcompiler.a, except main.cpp and userland.cpp.
Next, the build process links main.cpp, userland.cpp, and libcompiler.a
into zig1. userland.cpp is a shim for functions that will later be
replaced with self-hosted implementations.
Next, the build process uses zig1 to build src-self-hosted/stage1.zig
into libuserland.a, which does not depend on any of the things that
are shimmed in userland.cpp, such as translate-c.
Finally, the build process re-links main.cpp and libcompiler.a, except
with libuserland.a instead of userland.cpp. Now the shims are replaced
with .zig code. This provides all of the Zig standard library to the
stage1 C++ compiler, and enables us to move certain things to userland,
such as translate-c.
As a proof of concept I have made the `zig zen` command use text defined
in userland. I added `zig translate-c-2` which is a work-in-progress
reimplementation of translate-c in userland, which currently calls
`std.debug.panic("unimplemented")` and you can see the stack trace makes
it all the way back into the C++ main() function (Thanks LemonBoy for
improving that!).
This could potentially let us move other things into userland, such as
hashing algorithms, the entire cache system, .d file parsing, pretty
much anything that libuserland.a itself doesn't need to depend on.
This can also let us have `zig fmt` in stage1 without the overhead
of child process execution, and without the initial compilation delay
before it gets cached.
See #1964
Does NOT look at the locale the way the C functions do.
int isalnum(int c);
int isalpha(int c);
int iscntrl(int c);
int isdigit(int c);
int isgraph(int c);
int islower(int c);
int isprint(int c);
int ispunct(int c);
int isspace(int c);
int isupper(int c);
int isxdigit(int c);
int isascii(int c);
int isblank(int c);
int toupper(int c);
int tolower(int c);
Tested to match glibc (when using C locale) with this program:
const c = @cImport({
// See https://github.com/ziglang/zig/issues/515
@cDefine("_NO_CRT_STDIO_INLINE", "1");
@cInclude("stdio.h");
@cInclude("string.h");
@cInclude("ctype.h");
});
const std = @import("std");
const ascii = std.ascii;
const abort = std.os.abort;
export fn main(argc: c_int, argv: **u8) c_int {
var i: u8 = undefined;
i = 0;
while (true) {
if (ascii.isAlNum(i) != (c.isalnum(i) > 0)) { abort(); }
if (ascii.isAlpha(i) != (c.isalpha(i) > 0)) { abort(); }
if (ascii.isCtrl(i) != (c.iscntrl(i) > 0)) { abort(); }
if (ascii.isDigit(i) != (c.isdigit(i) > 0)) { abort(); }
if (ascii.isGraph(i) != (c.isgraph(i) > 0)) { abort(); }
if (ascii.isLower(i) != (c.islower(i) > 0)) { abort(); }
if (ascii.isPrint(i) != (c.isprint(i) > 0)) { abort(); }
if (ascii.isPunct(i) != (c.ispunct(i) > 0)) { abort(); }
if (ascii.isSpace(i) != (c.isspace(i) > 0)) { abort(); }
if (ascii.isUpper(i) != (c.isupper(i) > 0)) { abort(); }
if (ascii.isXDigit(i) != (c.isxdigit(i) > 0)) { abort(); }
if (i == 255) { break; }
i += 1;
}
_ = c.printf(c"Success!\n");
return 0;
}
Unlike the other glibc source code checked into the repo, `csu/init.c`
did not have a license clause that allowed linking without restrictions.
`_IO_stdin_used` is the only symbol in the file and appears to be a 20
year old compatibility shim for the glibc 2.0 ABI. Obsolete in 2.1.
closes#2024
there's a new cli option `--main-pkg-path` which you can use to choose
a different root package directory besides the one inferred from the
root source file
and a corresponding build.zig API:
foo.setMainPkgPath(path)
* better libc detection
This introduces a new command `zig libc` which prints
the various paths of libc files. It outputs them to stdout
in a simple text file format that it is capable of parsing.
You can use `zig libc libc.txt` to validate a file.
These arguments are gone:
--libc-lib-dir [path] directory where libc crt1.o resides
--libc-static-lib-dir [path] directory where libc crtbegin.o resides
--msvc-lib-dir [path] (windows) directory where vcruntime.lib resides
--kernel32-lib-dir [path] (windows) directory where kernel32.lib resides
Instead we have this argument:
--libc [file] Provide a file which specifies libc paths
This is used to pass a libc text file (which can be generated with
`zig libc`). So it is easier to manage multiple cross compilation
environments.
`--cache on` now works when linking against libc.
`ZigTarget` now has a bool field `is_native`
Better error messaging when you try to link against libc or use
`@cImport` but the various paths cannot be found. It should also be
faster.
* save native_libc.txt in zig-cache
This avoids having to detect libc at runtime on every invocation.
Mostly picking the same paths as FreeBSD.
We need a little special handling for crt files, as netbsd uses its
own (and not GCC's) for those, with slightly different names.
Andrew Kelley
Shritesh Bhattarai
Marc Tiehuis
vegecode
emekoi
Shawn Landden
Jay Weisskopf
John Schmidt
daurnimator
Maya Rashish