| author |  Alex Rønne Petersen <alex@alexrp.com> 2026-04-14 14:08:32+02:00 |
| committer | Alex Rønne Petersen <alex@alexrp.com> 2026-04-17 12:07:57+02:00 |
| log | 5464392e116b590cc9c2b662e967bc544b7d0a64 |
| tree | 962fa999dd3b447e7aeb587ba1850aa39060fe92 |
| parent | adb1f3efc21adad67fe2638c889178401ca602a1 |
| signature |  Signed by SSH key SHA256:7B/LJ7bpR1eX8aCXSr4mtd5M45VMPKcx9zY8e95b5QM |
std.os: add APIs to determine whether Zig std requires libc for a target
This is distinct from the question of whether the target formally considers libc
to be the only stable syscall interface; for example, FreeBSD and NetBSD have
stable syscalls, but we don't yet have syscall layers for them in std.os.3 files changed, 43 insertions(+), 14 deletions(-)
lib- std
- src
- Compilation
- test
lib/std/os.zig+41
| ... | @@ -1,4 +1,5 @@ | ... | @@ -1,4 +1,5 @@ |
| 1 | const builtin = @import("builtin"); | 1 | const builtin = @import("builtin"); |
| 2 | const std = @import("std.zig"); | ||
| 2 | const native_os = builtin.os.tag; | 3 | const native_os = builtin.os.tag; |
| 3 | 4 | ||
| 4 | pub const linux = @import("os/linux.zig"); | 5 | pub const linux = @import("os/linux.zig"); |
| ... | @@ -8,6 +9,46 @@ pub const wasi = @import("os/wasi.zig"); | ... | @@ -8,6 +9,46 @@ pub const wasi = @import("os/wasi.zig"); |
| 8 | pub const emscripten = @import("os/emscripten.zig"); | 9 | pub const emscripten = @import("os/emscripten.zig"); |
| 9 | pub const windows = @import("os/windows.zig"); | 10 | pub const windows = @import("os/windows.zig"); |
| 10 | 11 | ||
| 12 | /// Returns whether the Zig standard library requires libc in order to interface | ||
| 13 | /// with the operating system on the given target. | ||
| 14 | pub fn targetRequiresLibC(target: *const std.Target) bool { | ||
| 15 | if (target.requiresLibC()) return true; | ||
| 16 | return switch (target.os.tag) { | ||
| 17 | .linux => switch (target.cpu.arch) { | ||
| 18 | // https://codeberg.org/ziglang/zig/issues/30940 | ||
| 19 | .alpha, | ||
| 20 | // https://codeberg.org/ziglang/zig/issues/30942 | ||
| 21 | .csky, | ||
| 22 | // https://codeberg.org/ziglang/zig/issues/30943 | ||
| 23 | .hppa, | ||
| 24 | .hppa64, | ||
| 25 | // https://codeberg.org/ziglang/zig/issues/30944 | ||
| 26 | .microblaze, | ||
| 27 | .microblazeel, | ||
| 28 | // https://codeberg.org/ziglang/zig/issues/30946 | ||
| 29 | .sh, | ||
| 30 | .sheb, | ||
| 31 | // https://codeberg.org/ziglang/zig/issues/30945 | ||
| 32 | .sparc, | ||
| 33 | // https://codeberg.org/ziglang/zig/issues/30947 | ||
| 34 | .xtensa, | ||
| 35 | .xtensaeb, | ||
| 36 | => true, | ||
| 37 | else => false, | ||
| 38 | }, | ||
| 39 | .freebsd => true, // https://codeberg.org/ziglang/zig/issues/30981 | ||
| 40 | .netbsd => true, // https://codeberg.org/ziglang/zig/issues/30980 | ||
| 41 | .openbsd => true, // https://codeberg.org/ziglang/zig/issues/30982 | ||
| 42 | else => false, | ||
| 43 | }; | ||
| 44 | } | ||
| 45 | |||
| 46 | /// Returns whether the Zig standard library requires libc in order to interface | ||
| 47 | /// with the operating system on the current target. | ||
| 48 | pub fn requiresLibC() bool { | ||
| 49 | return targetRequiresLibC(&builtin.target); | ||
| 50 | } | ||
| 51 | |||
| 11 | test { | 52 | test { |
| 12 | _ = linux; | 53 | _ = linux; |
| 13 | if (native_os == .uefi) _ = uefi; | 54 | if (native_os == .uefi) _ = uefi; |
src/Compilation/Config.zig+1-10
| ... | @@ -234,19 +234,10 @@ pub fn resolve(options: Options) ResolveError!Config { | ... | @@ -234,19 +234,10 @@ pub fn resolve(options: Options) ResolveError!Config { |
| 234 | break :b true; | 234 | break :b true; |
| 235 | } | 235 | } |
| 236 | if (options.link_libc) |x| break :b x; | 236 | if (options.link_libc) |x| break :b x; |
| 237 | switch (target.os.tag) { | ||
| 238 | // These targets don't require libc, but we don't yet have a syscall layer for them, | ||
| 239 | // so we default to linking libc for now. | ||
| 240 | .freebsd, | ||
| 241 | .netbsd, | ||
| 242 | .openbsd, | ||
| 243 | => break :b true, | ||
| 244 | else => {}, | ||
| 245 | } | ||
| 246 | if (options.ensure_libc_on_non_freestanding and target.os.tag != .freestanding) | 237 | if (options.ensure_libc_on_non_freestanding and target.os.tag != .freestanding) |
| 247 | break :b true; | 238 | break :b true; |
| 248 | 239 | ||
| 249 | break :b target.requiresLibC(); | 240 | break :b std.os.targetRequiresLibC(target); |
| 250 | }; | 241 | }; |
| 251 | 242 | ||
| 252 | const link_mode = b: { | 243 | const link_mode = b: { |
test/src/StackTrace.zig+1-4
| ... | @@ -58,10 +58,7 @@ fn addCaseTarget( | ... | @@ -58,10 +58,7 @@ fn addCaseTarget( |
| 58 | .fuchsia => false, | 58 | .fuchsia => false, |
| 59 | else => true, | 59 | else => true, |
| 60 | }; | 60 | }; |
| 61 | const both_libc = switch (target.result.os.tag) { | 61 | const both_libc = !std.os.targetRequiresLibC(&target.result); |
| 62 | .freebsd, .netbsd, .openbsd => false, | ||
| 63 | else => !target.result.requiresLibC(), | ||
| 64 | }; | ||
| 65 | 62 | ||
| 66 | // See `std.debug.StackIterator.fp_usability` logic. | 63 | // See `std.debug.StackIterator.fp_usability` logic. |
| 67 | const fp_usability: enum { useless, unsafe, safe, ideal } = switch (target.result.cpu.arch) { | 64 | const fp_usability: enum { useless, unsafe, safe, ideal } = switch (target.result.cpu.arch) { |