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1f896c1bf8
This lays the groundwork for #2879. This library will be built and linked when a static libc is going to be linked into the compilation. Currently, that means musl, wasi-libc, and MinGW-w64. As a demonstration, this commit removes the musl C code for a few string functions and implements them in libzigc. This means that those libzigc functions are now load-bearing for musl and wasi-libc. Note that if a function has an implementation in compiler-rt already, libzigc should not implement it. Instead, as we recently did for memcpy/memmove, we should delete the libc copy and rely on the compiler-rt implementation. I repurposed the existing "universal libc" code to do this. That code hadn't seen development beyond basic string functions in years, and was only usable-ish on freestanding. I think that if we want to seriously pursue the idea of Zig providing a freestanding libc, we should do so only after defining clear goals (and non-goals) for it. See also #22240 for a similar case.
34 lines
931 B
Zig
34 lines
931 B
Zig
//! This is Zig's multi-target implementation of libc.
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//!
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//! When `builtin.link_libc` is true, we need to export all the functions and
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//! provide a libc API compatible with the target (e.g. musl, wasi-libc, ...).
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const builtin = @import("builtin");
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const std = @import("std");
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// Avoid dragging in the runtime safety mechanisms into this .o file, unless
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// we're trying to test zigc.
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pub const panic = if (builtin.is_test)
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std.debug.FullPanic(std.debug.defaultPanic)
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else
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std.debug.no_panic;
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comptime {
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if (builtin.target.isMuslLibC() or builtin.target.isWasiLibC()) {
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// Files specific to musl and wasi-libc.
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_ = @import("c/string.zig");
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}
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if (builtin.target.isMuslLibC()) {
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// Files specific to musl.
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}
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if (builtin.target.isWasiLibC()) {
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// Files specific to wasi-libc.
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}
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if (builtin.target.isMinGW()) {
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// Files specific to MinGW-w64.
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}
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}
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