fms: add 32bit variant, add protections (#35010)

The GEOS Earth System Model currently requires the 32-bit variant of FMS. This PR adds that variant.

1 files changed, 13 insertions, 7 deletions

diff --git a/var/spack/repos/builtin/packages/fms/package.py b/var/spack/repos/builtin/packages/fms/package.py
index eeaa46d096..1b14765977 100644
--- a/var/spack/repos/builtin/packages/fms/package.py
+++ b/var/spack/repos/builtin/packages/fms/package.py
@@ -43,15 +43,20 @@ class Fms(CMakePackage):
     version(
         "2020.04.01", sha256="2c409242de7dea0cf29f8dbf7495698b6bcac1eeb5c4599a728bdea172ffe37c"
     )
-    version(
-        "2019.01.03", sha256="60a5181e883e141f2fdd4a30c535a788d609bcbbbca4af7e1ec73f66f4e58dc0"
-    )
 
     variant(
-        "64bit",
-        default=True,
-        description="Build a version of the library with default 64 bit reals",
+        "precision",
+        values=("32", "64"),
+        description="Build a version of the library with default 32 or 64 bit reals or both",
+        default="32",
+        multi=True,
     )
+    conflicts(
+        "precision=32,64",
+        when="@:2022.03",
+        msg="FMS versions prior to 2022.04 do not support both 32 and 64 bit precision",
+    )
+
     variant("gfs_phys", default=True, description="Use GFS Physics")
     variant("openmp", default=True, description="Use OpenMP")
     variant("quad_precision", default=True, description="quad precision reals")
@@ -80,13 +85,14 @@ class Fms(CMakePackage):
 
     def cmake_args(self):
         args = [
-            self.define_from_variant("64BIT"),
             self.define_from_variant("GFS_PHYS"),
             self.define_from_variant("OPENMP"),
             self.define_from_variant("ENABLE_QUAD_PRECISION", "quad_precision"),
             self.define_from_variant("WITH_YAML", "yaml"),
             self.define_from_variant("CONSTANTS"),
             self.define_from_variant("FPIC"),
+            self.define("32BIT", "precision=32" in self.spec),
+            self.define("64BIT", "precision=64" in self.spec),
         ]
 
         args.append(self.define("CMAKE_C_COMPILER", self.spec["mpi"].mpicc))