From eaf06dcdde5208a71bdf77d8af7e7902544c1f52 Mon Sep 17 00:00:00 2001
From: Ed Holmes <ed@kronus.io>
Date: Tue, 14 Jul 2026 09:41:00 +1000
Subject: [PATCH] Adds library configuration support for the __builtin_ctz,
 __builtin_ctzl, and __builtin_ctzll trailing zero count functions.

---
 cfg/gnu.cfg | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 1c8d1597a7f..6135d7e35ef 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -247,7 +247,10 @@
   <!-- int __builtin_ffsl (long) -->
   <!-- int __builtin_ffsll (long long) -->
   <!-- int __builtin_clz (unsigned int x) -->
-  <function name="__builtin_popcount,__builtin_parity,__builtin_ffs,__builtin_ffsl,__builtin_ffsll,__builtin_clz">
+  <!-- int __builtin_ctz (unsigned int x) -->
+  <!-- int __builtin_ctzl (unsigned long x) -->
+  <!-- int __builtin_ctzll (unsigned long long x) -->
+  <function name="__builtin_popcount,__builtin_parity,__builtin_ffs,__builtin_ffsl,__builtin_ffsll,__builtin_clz,__builtin_ctz,__builtin_ctzl,__builtin_ctzll">
     <noreturn>false</noreturn>
     <returnValue type="int"/>
     <use-retval/>