HB Improvements: Fix compiler warnings on modern compilers

Resolve warnings when compiling with gcc 4.8. Compiled with GCC 7.3,
no more compile errors/warnings; build ends with caught exception from
linker. This commit compiles with GCC 8.2, no more error/warnings; except
for a linking warning.

Change-Id: Ib5d7c2b5bd350edc76ee2c7de96896154cd44420
RTC: 202716
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/72271
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>
Reviewed-by: Ilya Smirnov <ismirno@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/src/usr/devicefw/driverif.C b/src/usr/devicefw/driverif.C
index acd2a5a1d..9f7c68995 100644
--- a/src/usr/devicefw/driverif.C
+++ b/src/usr/devicefw/driverif.C
@@ -5,7 +5,9 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* COPYRIGHT International Business Machines Corp. 2011,2014              */
+/* Contributors Listed Below - COPYRIGHT 2011,2019                        */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
 /*                                                                        */
 /* Licensed under the Apache License, Version 2.0 (the "License");        */
 /* you may not use this file except in compliance with the License.       */
@@ -31,6 +33,16 @@
 
 namespace DeviceFW
 {
+
+// This extension will silence warnings relating to the mis-match of argument
+// types used in the various aliases created in this document.
+
+// The following flag is only available in GCC 8
+#if __GNUC__ >= 8
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+#endif
+
     /** @brief Wrapper function to call singleton instance for registerRoute.
      *
      *  This is defined as an extern "C" function so that it can be aliased
@@ -199,4 +211,8 @@ namespace DeviceFW
                           AccessType_DriverOnly i_accessType, va_list i_args)
         __attribute__((alias("DeviceFW_deviceOpValist")));        
 
+#if __GNUC__ >= 8
+#pragma GCC diagnostic pop
+#endif
+
 };