gxsview: compiles against system qt and vtk on rhel8 (#43722)

* gxsview: compiles againts system qt and vtk on rhel8
* Update gxsview/package.py for blanks around operator
* Update gxsview/package.py import blank line
* Update gxsview/package.py for style
* Update gxsview/package.py checking vtk version

1 files changed, 21 insertions, 5 deletions

diff --git a/var/spack/repos/builtin/packages/gxsview/package.py b/var/spack/repos/builtin/packages/gxsview/package.py
index ea45246d1c..a041847752 100644
--- a/var/spack/repos/builtin/packages/gxsview/package.py
+++ b/var/spack/repos/builtin/packages/gxsview/package.py
@@ -3,6 +3,8 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
+import os
+
 from spack.package import *
 
 
@@ -51,11 +53,25 @@ class Gxsview(QMakePackage):
         vtk_suffix = self.spec["vtk"].version.up_to(2)
         vtk_lib_dir = self.spec["vtk"].prefix.lib
         vtk_include_dir = join_path(self.spec["vtk"].prefix.include, "vtk-{0}".format(vtk_suffix))
-        args = [
-            "VTK_LIB_DIR={0}".format(vtk_lib_dir),
-            "VTK_INC_DIR={0}".format(vtk_include_dir),
-            "VTK_MAJOR_VER={0}".format(str(vtk_suffix)),
-        ]
+        args = []
+        if not os.path.exists(vtk_include_dir):
+            vtk_include_dir = join_path(self.spec["vtk"].prefix.include, "vtk")
+            args.append("VTK_NO_VER_SUFFIX=ON")
+        args.extend(
+            [
+                "VTK_LIB_DIR={0}".format(vtk_lib_dir),
+                "VTK_INC_DIR={0}".format(vtk_include_dir),
+                "VTK_MAJOR_VER={0}".format(str(vtk_suffix)),
+            ]
+        )
+        # Below to avoid undefined reference to `std::filesystem::__cxx11::path::_M_split_cmpts()'
+        if self.spec.satisfies("%gcc@8.0:8.9") or self.spec.satisfies("%fj"):
+            if "^vtk@9:" in self.spec:
+                fic = "vtk9.pri"
+            else:
+                fic = "vtk8.pri"
+            with open(fic, "a") as fh:
+                fh.write("-lstdc++fs\n")
         return args
 
     def install(self, spec, prefix):