Add ignores for GCC 11 compiler warnings.

(Internal change: 2346268)

Author: comand

pxr/base/arch/pragmas.h

@@ -48,6 +48,9 @@
     #define ARCH_PRAGMA_UNUSED_FUNCTION \
         _Pragma("GCC diagnostic ignored \"-Wunused-function\"")
 
+    #define ARCH_PRAGMA_STRINGOP_OVERFLOW \
+        _Pragma("GCC diagnostic ignored \"-Wstringop-overflow=\"")
+
 #elif defined(ARCH_COMPILER_CLANG)
 
     #define ARCH_PRAGMA_PUSH \
@@ -181,6 +184,10 @@
     #define ARCH_PRAGMA_UNUSED_FUNCTION
 #endif
 
+#if !defined ARCH_PRAGMA_STRINGOP_OVERFLOW
+    #define ARCH_PRAGMA_STRINGOP_OVERFLOW
+#endif
+
 #if !defined ARCH_PRAGMA_UNUSED_PRIVATE_FIELD
     #define ARCH_PRAGMA_UNUSED_PRIVATE_FIELD
 #endif

pxr/base/vt/testenv/testVtCpp.cpp

@@ -53,6 +53,7 @@
 
 #include "pxr/base/arch/defines.h"
 #include "pxr/base/arch/fileSystem.h"
+#include "pxr/base/arch/pragmas.h"
 
 #include <cstdio>
 #include <cmath>
@@ -505,6 +506,9 @@ static void testArray() {
         // Test that attempts to create overly large arrays throw
         // std::bad_alloc
 
+ARCH_PRAGMA_PUSH
+ARCH_PRAGMA_STRINGOP_OVERFLOW
+
         VtIntArray ia;
         try {
             ia.resize(std::numeric_limits<size_t>::max());
@@ -530,6 +534,8 @@ static void testArray() {
         catch (std::bad_alloc const &) {
             // pass
         }
+
+ARCH_PRAGMA_POP
     }
 }