plasma: add code generation step for develop version (#31668)

Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

var/spack/repos/builtin/packages/plasma/package.py

@@ -40,6 +40,9 @@ class Plasma(CMakePackage):
     variant("shared", default=True, description="Build shared library (disables static library)")
     variant("lua", default=False, description="Build Lua support for tuning tile sizes")
 
+    # need a Python version to generate all precisions' code in repo
+    depends_on("python", when="@develop", type="build")
+
     depends_on("lua", when="+lua")
 
     depends_on("blas")
@@ -74,6 +77,10 @@ class Plasma(CMakePackage):
     patch("protect_cmake_version.patch", when="@19.8.0:19.8.9")
     patch("fix_cmake_include.patch", when="@19.8.0:19.8.9")
 
+    @when("@develop:")
+    def patch(self):
+        python("tools/generate_precisions.py")
+
     @when("@18.9.0:")
     def cmake_args(self):
         options = list()