[llvm-branch-commits] [clang] release/18.x: [clang] Don't assume location of compiler-rt for OpenBSD (#92183) (PR #92293)

[via llvm-branch-commits]

https://github.com/llvmbot created https://github.com/llvm/llvm-project/pull/92293

Backport be10746

Requested by: @Ericson2314

>From 5b09e6bf5aaeb21256e86455f8d6c42d01f71b95 Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson at Obsidian.Systems>
Date: Wed, 15 May 2024 12:43:55 -0400
Subject: [PATCH] [clang] Don't assume location of compiler-rt for OpenBSD
 (#92183)

If the `/usr/lib/...` path where compiler-rt is conventionally installed
on OpenBSD does not exist, fall back to the regular logic to find it.

This is a minimal change to allow OpenBSD cross compilation from a
toolchain that doesn't adopt all of OpenBSD's monorepo's conventions.

(cherry picked from commit be10746f3a4381456eb5082a968766201c17ab5d)
---
 clang/lib/Driver/ToolChains/OpenBSD.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Driver/ToolChains/OpenBSD.cpp b/clang/lib/Driver/ToolChains/OpenBSD.cpp
index fd6aa4d7e6844..00b6c520fcdd7 100644
--- a/clang/lib/Driver/ToolChains/OpenBSD.cpp
+++ b/clang/lib/Driver/ToolChains/OpenBSD.cpp
@@ -371,7 +371,8 @@ std::string OpenBSD::getCompilerRT(const ArgList &Args, StringRef Component,
   if (Component == "builtins") {
     SmallString<128> Path(getDriver().SysRoot);
     llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a");
-    return std::string(Path);
+    if (getVFS().exists(Path))
+      return std::string(Path);
   }
   SmallString<128> P(getDriver().ResourceDir);
   std::string CRTBasename =