diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31d19db0..52b541e8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -344,7 +344,9 @@ get_target_property(SWIG_FILES sta_swig SOURCES)
 foreach(SWIG_FILE ${SWIG_FILES})
   set_source_files_properties(${SWIG_FILE}
     PROPERTIES
-    COMPILE_OPTIONS "-Wno-cast-qual;-Wno-missing-braces"
+    # No simple way to modify the swig template that emits code full of warnings
+    # so suppress them.
+    COMPILE_OPTIONS "-Wno-cast-qual;-Wno-missing-braces;-Wno-deprecated-declarations"
   )
 endforeach()
 
diff --git a/sdf/SdfWriter.cc b/sdf/SdfWriter.cc
index e5055278..19c1edfb 100644
--- a/sdf/SdfWriter.cc
+++ b/sdf/SdfWriter.cc
@@ -729,8 +729,9 @@ SdfWriter::sdfPathName(const Pin *pin)
   else {
     char *inst_path = sdfPathName(inst);
     const char *port_name = sdfPortName(pin);
-    char *sdf_name = makeTmpString(strlen(inst_path)+1+strlen(port_name)+1);
-    sprintf(sdf_name, "%s%c%s", inst_path, sdf_divider_, port_name);
+    size_t length = strlen(inst_path) + 1 + strlen(port_name) + 1;
+    char *sdf_name = makeTmpString(length);
+    snprintf(sdf_name, length, "%s%c%s", inst_path, sdf_divider_, port_name);
     return sdf_name;
   }
 }