From 2f3c7cae61aa618f94b6078c2e66372d1a12f82e Mon Sep 17 00:00:00 2001
From: Michael Zillgith <michael.zillgith@mz-automation.de>
Date: Sat, 12 Nov 2022 07:22:33 +0000
Subject: [PATCH] - added -Wundef compiler flag and removed some of the
 resulting warnings

---
 CMakeLists.txt                       | 5 +++++
 src/iec61850/client/client_control.c | 2 +-
 src/mms/iso_mms/asn1c/asn_internal.h | 2 ++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 618916e9..6172e302 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,6 +144,11 @@ if (SUPPORT_REDUNDANT_DECLS)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wredundant-decls")
 endif(SUPPORT_REDUNDANT_DECLS)
 
+check_c_compiler_flag("-Wundef" SUPPORT_UNDEF)
+if (SUPPORT_UNDEF)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wundef")
+endif(SUPPORT_UNDEF)
+
 # write the detected stuff to this file
 configure_file(
     ${CMAKE_CURRENT_LIST_DIR}/config/stack_config.h.cmake
diff --git a/src/iec61850/client/client_control.c b/src/iec61850/client/client_control.c
index caa07148..ee9ec9e9 100644
--- a/src/iec61850/client/client_control.c
+++ b/src/iec61850/client/client_control.c
@@ -29,7 +29,7 @@
 #include "mms_client_connection.h"
 #include "ied_connection_private.h"
 
-#if _MSC_VER
+#ifdef _MSC_VER
 #define snprintf _snprintf
 #endif
 
diff --git a/src/mms/iso_mms/asn1c/asn_internal.h b/src/mms/iso_mms/asn1c/asn_internal.h
index 493b4336..5d6910d8 100644
--- a/src/mms/iso_mms/asn1c/asn_internal.h
+++ b/src/mms/iso_mms/asn1c/asn_internal.h
@@ -11,6 +11,8 @@
 
 #include "asn_application.h"	/* Application-visible API */
 
+#define EMIT_ASN_DEBUG 0
+
 #include "lib_memory.h"
 
 #ifndef	__NO_ASSERT_H__		/* Include assert.h only for internal use. */