From 7d6555b11f181bdc24ba56577f753a07add6e8c7 Mon Sep 17 00:00:00 2001
From: Matt Jolly <kangie@gentoo.org>
Date: Tue, 16 Jun 2026 21:57:07 -0700
Subject: [PATCH] build: Fix get_path_info on empty ar in unbundle toolchain

Some toolchains leave ar empty during initial setup, causing GN to error
when get_path_info() is called with an empty string. Guard the check to
only run when ar is not empty.

Signed-off-by: Matt Jolly <kangie@gentoo.org>
Change-Id: I87615806ddfda6f262a7500b0c5b6fed1f452985
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7949777
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Matt Stark <msta@google.com>
Cr-Commit-Position: refs/heads/main@{#1648076}
---

diff --git a/build/toolchain/gcc_toolchain.gni b/build/toolchain/gcc_toolchain.gni
index ec66ab3..d8457bfa 100644
--- a/build/toolchain/gcc_toolchain.gni
+++ b/build/toolchain/gcc_toolchain.gni
@@ -409,8 +409,9 @@
       } else {
         command = "rm -f {{output}} && $command"
 
-        # Add ar to inputs if it's not from $PATH.
-        if (get_path_info(ar, "file") != ar) {
+        # Add ar to inputs if it's not from $PATH. Some toolchains leave
+        # |ar| empty during toolchain setup, so guard get_path_info() here.
+        if (ar != "" && get_path_info(ar, "file") != ar) {
           inputs =
               [ get_path_info(rebase_path(ar, ".", root_out_dir), "abspath") ]
         }