hdf5: Protect call to check_min_cppstd() when appropriate (#28381)

Author: robomics

recipes/hdf5/all/conanfile.py

@@ -96,7 +96,8 @@ def validate(self):
             raise ConanInvalidConfiguration("with_zlib and with_zlibng cannot be enabled at the same time")
         if self.options.get_safe("with_zlibng") and Version(self.version) < "1.14.5":
             raise ConanInvalidConfiguration("with_zlibng=True is incompatible with versions prior to v1.14.5")
-        check_min_cppstd(self, "11")
+        if self.options.enable_cxx:
+            check_min_cppstd(self, "11")
 
     def validate_build(self):
         if cross_building(self) and Version(self.version) < "1.14.4.3":