NetCDF: fix constraints. (#16719)

var/spack/repos/builtin/packages/netcdf-c/package.py

@@ -97,26 +97,15 @@ def url_for_version(self, version):
 
     # High-level API of HDF5 1.8.9 or later is required for netCDF-4 support:
     # http://www.unidata.ucar.edu/software/netcdf/docs/getting_and_building_netcdf.html
-    depends_on('hdf5@1.8.9:+hl~mpi', when='~mpi')
+    depends_on('hdf5@1.8.9:+hl')
-    depends_on('hdf5@1.8.9:+hl+mpi', when='+mpi')
 
     # Starting version 4.4.0, it became possible to disable parallel I/O even
     # if HDF5 supports it. For previous versions of the library we need
-    # HDF5 without mpi support to disable parallel I/O.
+    # HDF5 without mpi support to disable parallel I/O:
-    # The following doesn't work if hdf5+mpi by default and netcdf-c~mpi is
+    depends_on('hdf5~mpi', when='@:4.3~mpi')
-    # specified in packages.yaml
-    # depends_on('hdf5~mpi', when='@:4.3~mpi')
-    # Thus, we have to introduce a conflict
-    conflicts('~mpi', when='@:4.3^hdf5+mpi',
-              msg='netcdf-c@:4.3~mpi requires hdf5~mpi')
 
     # We need HDF5 with mpi support to enable parallel I/O.
-    # The following doesn't work if hdf5~mpi by default and netcdf-c+mpi is
+    depends_on('hdf5+mpi', when='+mpi')
-    # specified in packages.yaml
-    # depends_on('hdf5+mpi', when='+mpi')
-    # Thus, we have to introduce a conflict
-    conflicts('+mpi', when='^hdf5~mpi',
-              msg='netcdf-c+mpi requires hdf5+mpi')
 
     # NetCDF 4.4.0 and prior have compatibility issues with HDF5 1.10 and later
     # https://github.com/Unidata/netcdf-c/issues/250

var/spack/repos/builtin/packages/netcdf-fortran/package.py

@@ -22,19 +22,12 @@ class NetcdfFortran(AutotoolsPackage):
     version('4.4.4', sha256='b2d395175f8d283e68c8be516e231a96b191ade67ad0caafaf7fa01b1e6b5d75')
     version('4.4.3', sha256='330373aa163d5931e475b5e83da5c1ad041e855185f24e6a8b85d73b48d6cda9')
 
-    variant('mpi', default=True,
-            description='Enable parallel I/O for netcdf-4')
     variant('pic', default=True,
             description='Produce position-independent code (for shared libs)')
     variant('shared', default=True, description='Enable shared library')
     variant('doc', default=False, description='Enable building docs')
 
-    # We need to build with MPI wrappers if parallel I/O features is enabled:
+    depends_on('netcdf-c')
-    # https://www.unidata.ucar.edu/software/netcdf/docs/building_netcdf_fortran.html
-    depends_on('mpi', when='+mpi')
-
-    depends_on('netcdf-c~mpi~parallel-netcdf', when='~mpi')
-    depends_on('netcdf-c+mpi', when='+mpi')
     depends_on('doxygen', when='+doc', type='build')
 
     # The default libtool.m4 is too old to handle NAG compiler properly:
@@ -66,17 +59,15 @@ class NetcdfFortran(AutotoolsPackage):
     def flag_handler(self, name, flags):
         config_flags = None
 
-        if '+pic' in self.spec:
+        if name == 'cflags':
-            # Unlike NetCDF-C, we add PIC flag only when +pic. Adding the
+            if '+pic' in self.spec:
-            # flags also when ~shared would make it impossible to build a
+                flags.append(self.compiler.cc_pic_flag)
-            # static-only version of the library with NAG.
+        elif name == 'fflags':
-            if name == 'cflags':
+            if '+pic' in self.spec:
-                config_flags = [self.compiler.cc_pic_flag]
+                flags.append(self.compiler.f77_pic_flag)
-            elif name == 'fflags':
+            if self.spec.satisfies('%gcc@10:'):
-                config_flags = [self.compiler.f77_pic_flag]
+                # https://github.com/Unidata/netcdf-fortran/issues/212
-
+                flags.append('-fallow-argument-mismatch')
-        if name == 'cppflags':
-            config_flags = [self.spec['netcdf-c'].headers.cpp_flags]
         elif name == 'ldflags':
             # We need to specify LDFLAGS to get correct dependency_libs
             # in libnetcdff.la, so packages that use libtool for linking
@@ -84,11 +75,6 @@ def flag_handler(self, name, flags):
             # building takes place outside of Spack environment, i.e.
             # without Spack's compiler wrappers.
             config_flags = [self.spec['netcdf-c'].libs.search_flags]
-        elif name == 'fflags' and self.spec.satisfies('%gcc@10:'):
-            # https://github.com/Unidata/netcdf-fortran/issues/212
-            if config_flags is None:
-                config_flags = []
-            config_flags.append('-fallow-argument-mismatch')
 
         return flags, None, config_flags
 
@@ -122,7 +108,11 @@ def configure_args(self):
         config_args = self.enable_or_disable('shared')
         config_args.append('--enable-static')
 
-        if '+mpi' in self.spec:
+        # We need to build with MPI wrappers if either of the parallel I/O
+        # features is enabled in netcdf-c:
+        # https://www.unidata.ucar.edu/software/netcdf/docs/building_netcdf_fortran.html
+        netcdf_c_spec = self.spec['netcdf-c']
+        if '+mpi' in netcdf_c_spec or '+parallel-netcdf' in netcdf_c_spec:
             config_args.append('CC=%s' % self.spec['mpi'].mpicc)
             config_args.append('FC=%s' % self.spec['mpi'].mpifc)
             config_args.append('F77=%s' % self.spec['mpi'].mpif77)