diff --git a/sys-devel/llvm/patches/llvm20-20.1.0.patchset b/sys-devel/llvm/patches/llvm20-20.1.0.patchset
index 88f5081ad..d303bbbd8 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 8e4dcdc6b46688e5067bef2bdc07a81d932af3ed Mon Sep 17 00:00:00 2001
+From a9e7dab82fa1952557b0da7724ba2eeef3b7f854 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
@@ -1020,13 +1020,14 @@ index 8b7874b..489c948 100644
  // Syscall wrappers.
  uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
 diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
-index e11eff1..43e9fb6 100644
+index e11eff1..950f644 100644
 --- a/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
 +++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cpp
-@@ -13,8 +13,9 @@
+@@ -13,8 +13,10 @@
  
  #include "sanitizer_platform.h"
  
++#define _GNU_SOURCE 1
 +#define _DEFAULT_SOURCE 1
  #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
 -    SANITIZER_SOLARIS
@@ -1034,7 +1035,7 @@ index e11eff1..43e9fb6 100644
  
  #  include "sanitizer_allocator_internal.h"
  #  include "sanitizer_atomic.h"
-@@ -74,6 +75,11 @@ extern "C" int __sys_sigaction(int signum, const struct sigaction *act,
+@@ -74,6 +76,11 @@ extern "C" int __sys_sigaction(int signum, const struct sigaction *act,
  #    include <thread.h>
  #  endif
  
@@ -1046,7 +1047,7 @@ index e11eff1..43e9fb6 100644
  #  if SANITIZER_ANDROID
  #    include <android/api-level.h>
  #    if !defined(CPU_COUNT) && !defined(__aarch64__)
-@@ -650,7 +656,6 @@ static void GetTls(uptr *addr, uptr *size) {
+@@ -650,7 +657,6 @@ static void GetTls(uptr *addr, uptr *size) {
        *addr = (uptr)tcb->tcb_dtv[1];
      }
    }
@@ -1054,7 +1055,7 @@ index e11eff1..43e9fb6 100644
  #      error "Unknown OS"
  #    endif
  }
-@@ -720,8 +725,13 @@ static int AddModuleSegments(const char *module_name, dl_phdr_info *info,
+@@ -720,8 +726,13 @@ static int AddModuleSegments(const char *module_name, dl_phdr_info *info,
      if (phdr->p_type == PT_LOAD) {
        uptr cur_beg = info->dlpi_addr + phdr->p_vaddr;
        uptr cur_end = cur_beg + phdr->p_memsz;
@@ -1068,7 +1069,7 @@ index e11eff1..43e9fb6 100644
        cur_module.addAddressRange(cur_beg, cur_end, executable, writable);
      } else if (phdr->p_type == PT_NOTE) {
  #  ifdef NT_GNU_BUILD_ID
-@@ -857,6 +867,10 @@ u32 GetNumberOfCPUs() {
+@@ -857,6 +868,10 @@ u32 GetNumberOfCPUs() {
    req[1] = HW_NCPU;
    CHECK_EQ(internal_sysctl(req, 2, &ncpu, &len, NULL, 0), 0);
    return ncpu;