Add clangNosvOpenmp-ld compiler test

Add a test to verify that "clang -fopenmp=libompv" links correctly with
nOS-V even though it is not placed in the buildInputs.

Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>
Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Tested-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>

overlay.nix

@@ -79,6 +79,9 @@ in bscPkgs // {
       clangNosvOpenmp-nosv = callPackage ./test/compilers/clang-openmp-nosv.nix {
         stdenv = final.stdenvClangOmpss2Nodes;
       };
+      clangNosvOpenmp-ld = callPackage ./test/compilers/clang-openmp-ld.nix {
+        stdenv = final.stdenvClangOmpss2Nodes;
+      };
     };
 
     pkgs = final.runCommand "ci-pkgs" { }

test/compilers/clang-openmp-ld.nix

@@ -0,0 +1,46 @@
+{
+  stdenv
+, writeText
+, openmp
+}:
+
+let
+  hello_c = writeText "hello.c" ''
+  int main(int argc, char *argv[])
+  {
+    #pragma omp parallel
+    {
+    }
+
+    return 0;
+  }
+  '';
+
+in stdenv.mkDerivation {
+  pname = "openmp-test-ld";
+  version = "1.0.0";
+
+  dontUnpack = true;
+  dontConfigure = true;
+
+  # nOS-V requires access to /sys/devices to request NUMA information. It will
+  # fail to run otherwise, so we disable the sandbox for this test.
+  __noChroot = true;
+
+  buildInputs = [ openmp ];
+
+  buildPhase = ''
+    set -x
+
+    cp ${hello_c} hello.c
+    clang -fopenmp=libompv ./hello.c -o hello
+
+    set +x
+  '';
+
+  installPhase = ''
+    touch $out
+  '';
+
+}
+