From f21a78b5a31b13d5b6bb84c23c4a35e64402d0e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Tue, 14 Oct 2025 23:18:20 +0200
Subject: [PATCH] std.debug.SelfInfo.Elf: don't support DWARF unwinding for
 Hexagon and PowerPC

As for SPARC, FP-based unwinding is superior on these.
---
 lib/std/debug/SelfInfo/Elf.zig | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/lib/std/debug/SelfInfo/Elf.zig b/lib/std/debug/SelfInfo/Elf.zig
index f10dc3cd63..bee04a5eef 100644
--- a/lib/std/debug/SelfInfo/Elf.zig
+++ b/lib/std/debug/SelfInfo/Elf.zig
@@ -94,28 +94,22 @@ pub const can_unwind: bool = s: {
     // Notably, we are yet to support unwinding on ARM. There, unwinding is not done through
     // `.eh_frame`, but instead with the `.ARM.exidx` section, which has a different format.
     const archs: []const std.Target.Cpu.Arch = switch (builtin.target.os.tag) {
-        // Not supported yet: arm, m68k, sparc64
+        // Not supported yet: arm, m68k
         .haiku => &.{
             .aarch64,
-            .powerpc,
             .riscv64,
             .x86,
             .x86_64,
         },
-        // Not supported yet: arc, arm/armeb/thumb/thumbeb, csky, m68k, or1k, sparc/sparc64, xtensa
+        // Not supported yet: arc, arm/armeb/thumb/thumbeb, csky, m68k, or1k, xtensa
         .linux => &.{
             .aarch64,
             .aarch64_be,
-            .hexagon,
             .loongarch64,
             .mips,
             .mipsel,
             .mips64,
             .mips64el,
-            .powerpc,
-            .powerpcle,
-            .powerpc64,
-            .powerpc64le,
             .riscv32,
             .riscv64,
             .s390x,
@@ -134,28 +128,23 @@ pub const can_unwind: bool = s: {
         // Not supported yet: arm
         .freebsd => &.{
             .aarch64,
-            .powerpc64,
-            .powerpc64le,
             .riscv64,
             .x86_64,
         },
-        // Not supported yet: arm/armeb, m68k, mips64/mips64el, sparc/sparc64
+        // Not supported yet: arm/armeb, m68k, mips64/mips64el
         .netbsd => &.{
             .aarch64,
             .aarch64_be,
             .mips,
             .mipsel,
-            .powerpc,
             .x86,
             .x86_64,
         },
-        // Not supported yet: arm, sparc64
+        // Not supported yet: arm
         .openbsd => &.{
             .aarch64,
             .mips64,
             .mips64el,
-            .powerpc,
-            .powerpc64,
             .riscv64,
             .x86,
             .x86_64,
@@ -165,7 +154,6 @@ pub const can_unwind: bool = s: {
             .x86,
             .x86_64,
         },
-        // Not supported yet: sparc64
         .solaris => &.{
             .x86_64,
         },