[clang] [clang] recognize any *-ld.lld variant (PR #117338)

[Brian Cain via cfe-commits]

https://github.com/androm3da updated https://github.com/llvm/llvm-project/pull/117338

>From 607746891ed8683262c468be8d2848c7ad88b320 Mon Sep 17 00:00:00 2001
From: Brian Cain <bcain at quicinc.com>
Date: Thu, 21 Nov 2024 19:46:04 -0800
Subject: [PATCH] [clang] recognize hexagon-*-ld.lld variants

If we create a cross toolchain with a ${triple}-ld.lld symlink, clang finds
that symlink and when it uses it, it's not recognized as "lld".  Let's
resolve that symlink and consider it when determining lld-ness.

For example, clang provides hexagon-link specific link arguments such as
`-mcpu=hexagonv65` and `-march=hexagon` when hexagon-unknown-linux-musl-ld.lld
is found.  lld rejects this with the following error:

    hexagon-unknown-linux-musl-ld.lld: error: unknown emulation: cpu=hexagonv65
---
 clang/lib/Driver/ToolChains/Hexagon.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Hexagon.cpp b/clang/lib/Driver/ToolChains/Hexagon.cpp
index 29781399cbab44..829703d25b1516 100644
--- a/clang/lib/Driver/ToolChains/Hexagon.cpp
+++ b/clang/lib/Driver/ToolChains/Hexagon.cpp
@@ -294,9 +294,10 @@ constructHexagonLinkArgs(Compilation &C, const JobAction &JA,
   bool IncStartFiles = !Args.hasArg(options::OPT_nostartfiles);
   bool IncDefLibs = !Args.hasArg(options::OPT_nodefaultlibs);
   bool UseG0 = false;
-  const char *Exec = Args.MakeArgString(HTC.GetLinkerPath());
-  bool UseLLD = (llvm::sys::path::filename(Exec).equals_insensitive("ld.lld") ||
-                 llvm::sys::path::stem(Exec).equals_insensitive("ld.lld"));
+  bool UseLLD = false;
+  const char *Exec = Args.MakeArgString(HTC.GetLinkerPath(&UseLLD));
+  UseLLD = UseLLD || llvm::sys::path::filename(Exec).endswith("ld.lld") ||
+           llvm::sys::path::stem(Exec).endswith("ld.lld");
   bool UseShared = IsShared && !IsStatic;
   StringRef CpuVer = toolchains::HexagonToolChain::GetTargetCPUVersion(Args);