From 3e1ab4191cc4a09e267f2a3e945a64f3000fa9cc Mon Sep 17 00:00:00 2001
From: Xavier Bouchoux <xavierb@gmail.com>
Date: Sat, 26 Oct 2024 10:37:39 +0200
Subject: [PATCH] link/Elf.zig: ensure capacity before appending linker args.

fixes e567abb339e1edaf5a3c86fe632522a3b8005275 "rework linker inputs"
closes https://github.com/ziglang/zig/issues/21801
---
 src/link/Elf.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/link/Elf.zig b/src/link/Elf.zig
index d02d98800dd9..8a5e8f928263 100644
--- a/src/link/Elf.zig
+++ b/src/link/Elf.zig
@@ -1962,7 +1962,8 @@ fn linkWithLLD(self: *Elf, arena: Allocator, tid: Zcu.PerThread.Id, prog_node: s
         if (is_exe_or_dyn_lib) {
             // Worst-case, we need an --as-needed argument for every lib, as well
             // as one before and one after.
-            try argv.append("--as-needed");
+            try argv.ensureUnusedCapacity(2 * self.base.comp.link_inputs.len + 2);
+            argv.appendAssumeCapacity("--as-needed");
             var as_needed = true;
 
             for (self.base.comp.link_inputs) |link_input| switch (link_input) {