[Flang] Link -lflang_rt.runtime if available on the device

[jhuber6]

Summary:
Now that we can build the Fortran runtime on the GPU (mostly) we should
be able to implicitly link it if it exists. This matches the normal
behavior where it is included implicity. No tests because it
would require a full VFS and is fairly trivial.

[llvmbot]

@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-clang

Author: Joseph Huber (jhuber6)

Changes

Summary:
Now that we can build the Fortran runtime on the GPU (mostly) we should
be able to implicitly link it if it exists. This matches the normal
behavior where it is included implicity. No tests because it
would require a full VFS and is fairly trivial.

---

Full diff: https://github.com/llvm/llvm-project/pull/132737.diff

1 Files Affected:

• (modified) clang/lib/Driver/ToolChains/Clang.cpp (+5)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index fb3ed2db0e3c0..d7da2af321e7b 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -9337,6 +9337,11 @@ void LinkerWrapper::ConstructJob(Compilation &C, const JobAction &JA,
         CmdArgs.push_back(
             Args.MakeArgString("--device-linker=" + TC.getTripleString() + "=" +
                                "-lclang_rt.builtins"));
+      bool HasFlangRT = HasCompilerRT && C.getDriver().IsFlangMode();
+      if (HasCompilerRT)
+        CmdArgs.push_back(
+            Args.MakeArgString("--device-linker=" + TC.getTripleString() + "=" +
+                               "-lflang_rt.runtime"));
     });
   }
 

[Meinersbur]

LGTM