diff --git a/sys-devel/llvm/patches/llvm20-20.1.0.patchset b/sys-devel/llvm/patches/llvm20-20.1.0.patchset
index 888ef6e9f..88f5081ad 100644
--- a/sys-devel/llvm/patches/llvm20-20.1.0.patchset
+++ b/sys-devel/llvm/patches/llvm20-20.1.0.patchset
@@ -370,7 +370,7 @@ index a1e9eca..cc563d7 100644
 2.45.2
 
 
-From fe2ce5b227045fa7431fa1974506b983127b982a Mon Sep 17 00:00:00 2001
+From 8e4dcdc6b46688e5067bef2bdc07a81d932af3ed Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
 Date: Thu, 6 Feb 2025 21:08:43 +0100
 Subject: Haiku: Address sanitizer on x86_64
@@ -505,21 +505,22 @@ index cf729c3..e3310b1 100644
  else()
    set(COMPILER_RT_HAS_UBSAN FALSE)
 diff --git a/compiler-rt/lib/asan/asan_linux.cpp b/compiler-rt/lib/asan/asan_linux.cpp
-index 4cabca3..6fcd4e0 100644
+index 4cabca3..b047eec 100644
 --- a/compiler-rt/lib/asan/asan_linux.cpp
 +++ b/compiler-rt/lib/asan/asan_linux.cpp
-@@ -12,8 +12,9 @@
+@@ -12,8 +12,10 @@
  //===----------------------------------------------------------------------===//
  
  #include "sanitizer_common/sanitizer_platform.h"
 +#define _DEFAULT_SOURCE 1
++#define _GNU_SOURCE 1
  #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
 -    SANITIZER_SOLARIS
 +    SANITIZER_SOLARIS || SANITIZER_HAIKU
  
  #  include <dlfcn.h>
  #  include <fcntl.h>
-@@ -22,7 +23,9 @@
+@@ -22,7 +24,9 @@
  #  include <stdio.h>
  #  include <sys/mman.h>
  #  include <sys/resource.h>
@@ -529,7 +530,7 @@ index 4cabca3..6fcd4e0 100644
  #  include <sys/time.h>
  #  include <sys/types.h>
  #  include <unistd.h>
-@@ -37,7 +40,7 @@
+@@ -37,7 +41,7 @@
  #  include "sanitizer_common/sanitizer_libc.h"
  #  include "sanitizer_common/sanitizer_procmaps.h"
  
@@ -538,7 +539,7 @@ index 4cabca3..6fcd4e0 100644
  #    include <sys/link_elf.h>
  #  endif
  
-@@ -45,8 +48,12 @@
+@@ -45,8 +49,12 @@
  #    include <link.h>
  #  endif
  
@@ -552,7 +553,7 @@ index 4cabca3..6fcd4e0 100644
  #  elif SANITIZER_NETBSD
  #    include <link_elf.h>
  #    include <ucontext.h>
-@@ -125,6 +132,12 @@ static int FindFirstDSOCallback(struct dl_phdr_info *info, size_t size,
+@@ -125,6 +133,12 @@ static int FindFirstDSOCallback(struct dl_phdr_info *info, size_t size,
      return 0;
    }