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builtin: Add zig_version

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This will enable code to perform version checks and make it easier to
support multiple versions of Zig.

Within the SemVer implementation, an intermediate value needed to be
coerced to a slice to workaround a comptime bug.

Closes #6466
This commit is contained in:
Jay Petacat 2021-01-04 23:48:34 -05:00 committed by Andrew Kelley
parent 5c49a137d5
commit a0ad2dee6a
2 changed files with 16 additions and 1 deletions
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11
lib/std/SemanticVersion.zig
View File

@ -102,7 +102,7 @@ pub fn parse(text: []const u8) !Version {
if (extra_index == null) return ver;
// Slice optional pre-release or build metadata components.
const extra = text[extra_index.?..text.len];
const extra: []const u8 = text[extra_index.?..text.len];
if (extra[0] == '-') {
const build_index = std.mem.indexOfScalar(u8, extra, '+');
ver.pre = extra[1..(build_index orelse extra.len)];
@ -293,3 +293,12 @@ fn testFmt(expected: []const u8, comptime template: []const u8, args: anytype) !
std.debug.warn("\n======================================\n", .{});
return error.TestFailed;
}
test "zig_version" {
// An approximate Zig build that predates this test.
const older_version = .{ .major = 0, .minor = 8, .patch = 0, .pre = "dev.874" };
// Simulated compatibility check using Zig version.
const compatible = comptime @import("builtin").zig_version.order(older_version) == .gt;
if (!compatible) @compileError("zig_version test failed");
}

6
src/Compilation.zig
View File

@ -2703,6 +2703,11 @@ pub fn generateBuiltinZigSource(comp: *Compilation, allocator: *Allocator) ![]u8
\\pub const arch = Target.current.cpu.arch;
\\/// Deprecated
\\pub const endian = Target.current.cpu.arch.endian();
\\
\\/// Zig version. When writing code that supports multiple versions of Zig, prefer
\\/// feature detection (i.e. with `@hasDecl` or `@hasField`) over version checks.
\\pub const zig_version = try @import("std").SemanticVersion.parse("{s}");
\\
\\pub const output_mode = OutputMode.{};
\\pub const link_mode = LinkMode.{};
\\pub const is_test = {};
@ -2714,6 +2719,7 @@ pub fn generateBuiltinZigSource(comp: *Compilation, allocator: *Allocator) ![]u8
\\ .features = Target.{}.featureSet(&[_]Target.{}.Feature{{
\\
, .{
build_options.version,
std.zig.fmtId(@tagName(comp.bin_file.options.output_mode)),
std.zig.fmtId(@tagName(comp.bin_file.options.link_mode)),
comp.bin_file.options.is_test,