MFEM: add new version v4.7 (#44010)

* Core change: logic for extracting RPATHs from modules may return
  `None`: filter this out of the set of RPATHs that is auto-generated
* Core change: `CachedCMakePackage` no longer adds ldflags to
  `CMAKE_STATIC_LINKER_FLAGS`: generally these flags are not appropriate
  for static linking (e.g. invocation of `ar`)
* [mfem] Add version 4.7
* [mfem] Add variant for precision (single/double). Enforce consistency
  for precision amongst mfem and hypre/petsc/mumps dependencies
* [mfem] Add cxxstd (and related constraints preventing use of
  old cxxstd values for newer versions of some dependencies)
* [hypre] In line with prior point, added support for specifying
  precision
* [petsc] Add config option to avoid error when building against
  `superlu-dist+rocm`
* [hiop] add proper `raja`/`umpire`/`camp` version constraints for
  `hiop` versions 0.3.99-0.4.x; require `+raja` for `+rocm`, and
  add dependency on `hiprand` for `+rocm`
* [butterflypack, mfem, strumpack, suite-sparse] Require
  `CRAYLIBS_{target-family}` env var to be defined
* [suite-sparse] versions `@7.4:` changed install location of headers:
  add symlink from old location to new location
* [zlib-ng] Fix error where shared libs were not successfully built for
  `%cce@17` (the build did not fail, but the finished `zlib-ng%cce@17`
  install did not have shared libs)

lib/spack/spack/build_environment.py

@@ -740,7 +740,9 @@ def get_rpaths(pkg):
     # Second module is our compiler mod name. We use that to get rpaths from
     # module show output.
     if pkg.compiler.modules and len(pkg.compiler.modules) > 1:
-        rpaths.append(path_from_modules([pkg.compiler.modules[1]]))
+        mod_rpath = path_from_modules([pkg.compiler.modules[1]])
+        if mod_rpath:
+            rpaths.append(mod_rpath)
     return list(dedupe(filter_system_paths(rpaths)))
 
 

lib/spack/spack/build_systems/cached_cmake.py

@@ -162,7 +162,9 @@ def initconfig_compiler_entries(self):
             ld_flags = " ".join(flags["ldflags"])
             ld_format_string = "CMAKE_{0}_LINKER_FLAGS"
             # CMake has separate linker arguments for types of builds.
-            for ld_type in ["EXE", "MODULE", "SHARED", "STATIC"]:
+            # 'ldflags' should not be used with CMAKE_STATIC_LINKER_FLAGS which
+            # is used by the archiver, so don't include "STATIC" in this loop:
+            for ld_type in ["EXE", "MODULE", "SHARED"]:
                 ld_string = ld_format_string.format(ld_type)
                 entries.append(cmake_cache_string(ld_string, ld_flags))