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std/build: fix ?[:0]const u8 build options

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As per the other string types, `?[:0]const u8` needs its own case
as otherwise it will raise an error about using `{}` with slices.

There's no reasonable workaround for this, as you would have to
either discount the use of the empty string value or manually
rework the string to be sentinel-terminated at runtime. It's
useful for passing build options to code making use of C libraries
that make strong use of sentinel-terminated arrays for strings.
This commit is contained in:
Michael Holmes 2021-04-05 22:54:04 +01:00 committed by Andrew Kelley
parent 89df41e5d8
commit 38d8aab4d2
1 changed files with 9 additions and 0 deletions
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9
lib/std/build.zig
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@ -1939,6 +1939,15 @@ pub const LibExeObjStep = struct {
out.print("pub const {}: []const u8 = \"{}\";\n", .{ std.zig.fmtId(name), std.zig.fmtEscapes(value) }) catch unreachable;
return;
},
?[:0]const u8 => {
out.print("pub const {}: ?[:0]const u8 = ", .{std.zig.fmtId(name)}) catch unreachable;
if (value) |payload| {
out.print("\"{}\";\n", .{std.zig.fmtEscapes(payload)}) catch unreachable;
} else {
out.writeAll("null;\n") catch unreachable;
}
return;
},
?[]const u8 => {
out.print("pub const {}: ?[]const u8 = ", .{std.zig.fmtId(name)}) catch unreachable;
if (value) |payload| {