[clang] [clang] recognize hexagon-*-ld.lld variants (PR #117338)

[Brian Cain via cfe-commits]

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

>From af213f3a80964faa3b80c95f8575a08c3dbd18c8 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
consider it as lld as long as it ends in "ld.lld".

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);