[clang] [Flang] Add fortran runtime libraries to AIX driver (PR #75921)

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https://github.com/madanial0 created https://github.com/llvm/llvm-project/pull/75921

Add fortran runtime libraries to flang-new on AIX

>From 08757c1fe91bb849699bddfa3543cc230e0012d9 Mon Sep 17 00:00:00 2001
From: Mark Danial <madanial at dixon.rtp.raleigh.ibm.com>
Date: Tue, 19 Dec 2023 05:43:44 -0500
Subject: [PATCH] [Flang] Add fortran libraries to AIX driver

---
 clang/lib/Driver/ToolChains/AIX.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/AIX.cpp b/clang/lib/Driver/ToolChains/AIX.cpp
index aed8734b2bab0f..71f93bca374852 100644
--- a/clang/lib/Driver/ToolChains/AIX.cpp
+++ b/clang/lib/Driver/ToolChains/AIX.cpp
@@ -328,6 +328,12 @@ void aix::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     }
   }
 
+  if (D.IsFlangMode()) {
+    addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+    addFortranRuntimeLibs(ToolChain, Args, CmdArgs);
+    CmdArgs.push_back("-lm");
+    CmdArgs.push_back("-lpthread");
+  }
   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));