[libc-commits] [libc] [libc] Fix vdso VER_FLG_BASE redefinition in overlay mod. (PR #108628)

[via libc-commits]

https://github.com/lntue created https://github.com/llvm/llvm-project/pull/108628

None

>From 09b0e8162f6b66257903d92c427d5af2b8c89f1f Mon Sep 17 00:00:00 2001
From: Tue Ly <lntue.h at gmail.com>
Date: Fri, 13 Sep 2024 19:04:16 +0000
Subject: [PATCH] [libc] Fix vdso VER_FLG_BASE redefinition in overlay mod.

---
 libc/src/__support/OSUtil/linux/vdso.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libc/src/__support/OSUtil/linux/vdso.cpp b/libc/src/__support/OSUtil/linux/vdso.cpp
index cb43764badad1f..8c9bd3e1bcc72b 100644
--- a/libc/src/__support/OSUtil/linux/vdso.cpp
+++ b/libc/src/__support/OSUtil/linux/vdso.cpp
@@ -57,7 +57,9 @@ struct Verdef {
 // https://refspecs.linuxfoundation.org/LSB_1.3.0/gLSB/gLSB/symversion.html#SYMVERTBL
 cpp::string_view find_version(Verdef *verdef, ElfW(Half) * versym,
                               const char *strtab, size_t idx) {
+#ifndef VER_FLG_BASE
   constexpr ElfW(Half) VER_FLG_BASE = 0x1;
+#endif
   if (!versym)
     return "";
   ElfW(Half) identifier = versym[idx] & 0x7FFF;