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zig cc: pass CPU features to Clang using the new -Xclangas when assembling

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Unfortunately, we cannot yet remove the special-casing for RISC-V CPU features,
so that code stays.

Closes #10411.
This commit is contained in:
Alex Rønne Petersen 2025-08-03 16:13:01 +02:00
parent c0cfe571f9
commit 8c47dda7df
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1 changed files with 37 additions and 32 deletions
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69
src/Compilation.zig
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@ -6798,6 +6798,43 @@ pub fn addCCArgs(
else => {},
}
const xclang_flag = switch (ext) {
.assembly, .assembly_with_cpp => "-Xclangas",
else => "-Xclang",
};
if (target_util.clangSupportsTargetCpuArg(target)) {
if (target.cpu.model.llvm_name) |llvm_name| {
try argv.appendSlice(&[_][]const u8{
xclang_flag, "-target-cpu", xclang_flag, llvm_name,
});
}
}
// It would be really nice if there was a more compact way to communicate this info to Clang.
const all_features_list = target.cpu.arch.allFeaturesList();
try argv.ensureUnusedCapacity(all_features_list.len * 4);
for (all_features_list, 0..) |feature, index_usize| {
const index = @as(std.Target.Cpu.Feature.Set.Index, @intCast(index_usize));
const is_enabled = target.cpu.features.isEnabled(index);
if (feature.llvm_name) |llvm_name| {
// We communicate float ABI to Clang through the dedicated options.
if (std.mem.startsWith(u8, llvm_name, "soft-float") or
std.mem.startsWith(u8, llvm_name, "hard-float"))
continue;
// Ignore these until we figure out how to handle the concept of omitting features.
// See https://github.com/ziglang/zig/issues/23539
if (target_util.isDynamicAMDGCNFeature(target, feature)) continue;
argv.appendSliceAssumeCapacity(&[_][]const u8{ xclang_flag, "-target-feature", xclang_flag });
const plus_or_minus = "-+"[@intFromBool(is_enabled)];
const arg = try std.fmt.allocPrint(arena, "{c}{s}", .{ plus_or_minus, llvm_name });
argv.appendAssumeCapacity(arg);
}
}
if (target.cpu.arch.isArm()) {
try argv.append(if (target.cpu.arch.isThumb()) "-mthumb" else "-mno-thumb");
}
@ -7134,38 +7171,6 @@ pub fn addCCArgs(
try argv.append(try std.fmt.allocPrint(arena, "-mcmodel={s}", .{@tagName(mod.code_model)}));
}
if (target_util.clangSupportsTargetCpuArg(target)) {
if (target.cpu.model.llvm_name) |llvm_name| {
try argv.appendSlice(&[_][]const u8{
"-Xclang", "-target-cpu", "-Xclang", llvm_name,
});
}
}
// It would be really nice if there was a more compact way to communicate this info to Clang.
const all_features_list = target.cpu.arch.allFeaturesList();
try argv.ensureUnusedCapacity(all_features_list.len * 4);
for (all_features_list, 0..) |feature, index_usize| {
const index = @as(std.Target.Cpu.Feature.Set.Index, @intCast(index_usize));
const is_enabled = target.cpu.features.isEnabled(index);
if (feature.llvm_name) |llvm_name| {
// We communicate float ABI to Clang through the dedicated options.
if (std.mem.startsWith(u8, llvm_name, "soft-float") or
std.mem.startsWith(u8, llvm_name, "hard-float"))
continue;
// Ignore these until we figure out how to handle the concept of omitting features.
// See https://github.com/ziglang/zig/issues/23539
if (target_util.isDynamicAMDGCNFeature(target, feature)) continue;
argv.appendSliceAssumeCapacity(&[_][]const u8{ "-Xclang", "-target-feature", "-Xclang" });
const plus_or_minus = "-+"[@intFromBool(is_enabled)];
const arg = try std.fmt.allocPrint(arena, "{c}{s}", .{ plus_or_minus, llvm_name });
argv.appendAssumeCapacity(arg);
}
}
{
var san_arg: std.ArrayListUnmanaged(u8) = .empty;
const prefix = "-fsanitize=";