Use lld linker for clangOmpss2 for LTO

test/compilers/lto.nix

@@ -0,0 +1,43 @@
+{ stdenv, writeText, which, strace }:
+
+let
+  hello_c = writeText "hello.c" ''
+    #include <stdio.h>
+    #include <limits.h>
+    #include <xmmintrin.h>
+
+    int main()
+    {
+            printf("Hello world!\n");
+            return 0;
+    }
+  '';
+in
+
+stdenv.mkDerivation rec {
+  version = "0.0.1";
+  name = "lto-c";
+  buildInputs = [ stdenv which strace ];
+  src = hello_c;
+  dontUnpack = true;
+  dontConfigure = true;
+  NIX_DEBUG = 0;
+  buildPhase = ''
+    set -x
+    echo CC=$CC
+    echo LD=$LD
+    echo -------------------------------------------
+    env
+    echo -------------------------------------------
+
+    cp ${hello_c} hello.c
+    $CC -v -flto hello.c -o hello
+    ./hello
+
+    set +x
+  '';
+
+  installPhase = ''
+    touch $out
+  '';
+}