build: update libghostty-vt vendor

vendor ghostty 063ac3e and remove the musl libc++ link workaround.

expose the new selection formatter and hyperlink uri apis for follow-up rendering work.

add manual artifact validation for static linux builds.

1 files changed, 65 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/pkg/highway/src/detect/aarch64_linux.zig b/vendor/libghostty-vt/pkg/highway/src/detect/aarch64_linux.zig
new file mode 100644
index 00000000..a4e74e67
--- /dev/null
+++ b/vendor/libghostty-vt/pkg/highway/src/detect/aarch64_linux.zig
@@ -0,0 +1,65 @@
+const HwyTargets = @import("../targets.zig").Targets;
+const linux = @import("linux.zig");
+
+pub fn detect(t: *HwyTargets) i64 {
+    // Linux exposes AArch64 features via getauxval(AT_HWCAP / AT_HWCAP2).
+    const AT_HWCAP: usize = 16;
+    const AT_HWCAP2: usize = 26;
+
+    const hwcap = linux.getauxval(AT_HWCAP);
+    const hwcap2 = linux.getauxval(AT_HWCAP2);
+
+    // Bit positions from Linux UAPI asm/hwcap.h
+    const HWCAP_AES: usize = 1 << 3;
+    const HWCAP_FPHP: usize = 1 << 9; // FEAT_FP16
+    const HWCAP_ASIMDDP: usize = 1 << 20; // DotProd
+    const HWCAP_SVE: usize = 1 << 22;
+
+    const HWCAP2_BF16: usize = 1 << 14;
+    const HWCAP2_SVE2: usize = 1 << 1;
+    const HWCAP2_SVEAES: usize = 1 << 2;
+
+    if (hwcap & HWCAP_AES != 0) {
+        t.neon = true;
+
+        if (hwcap & HWCAP_FPHP != 0 and
+            hwcap & HWCAP_ASIMDDP != 0 and
+            hwcap2 & HWCAP2_BF16 != 0)
+        {
+            t.neon_bf16 = true;
+        }
+    }
+
+    if (hwcap & HWCAP_SVE != 0) {
+        const vec_bytes = sveVectorBytes();
+
+        if (vec_bytes >= 32) {
+            t.sve = true;
+            if (vec_bytes == 32) {
+                t.sve_256 = true;
+            }
+        }
+
+        if (hwcap2 & HWCAP2_SVE2 != 0 and hwcap2 & HWCAP2_SVEAES != 0) {
+            if (vec_bytes >= 32) {
+                t.sve2 = true;
+            } else if (vec_bytes == 16) {
+                t.sve2_128 = true;
+            }
+        }
+    }
+
+    return @bitCast(t.*);
+}
+
+fn sveVectorBytes() usize {
+    // PR_SVE_GET_VL returns the SVE vector length in the lower 16 bits.
+    const PR_SVE_GET_VL: i32 = 51;
+    const ret = linux.prctl(PR_SVE_GET_VL, 0, 0, 0, 0);
+    const signed: isize = @bitCast(ret);
+    if (signed >= 0) {
+        return ret & 0xFFFF;
+    }
+    // prctl failed: assume 128-bit (NEON-width, conservative).
+    return 16;
+}