Fixes #234 ("dlmalloc_ext_2_8_6.c:warning: iteration 2305843009213693951 invokes undefined behavior")

Author: igaztanaga

doc/container.qbk

@@ -1425,6 +1425,7 @@ use [*Boost.Container]? There are several reasons for that:
 
 * Fixed bugs/issues:
    * [@https://github.com/boostorg/container/issues/297 GitHub #297: ['"flat_map::try_emplace does not compile if allocator has construct"]].
+   * [@https://github.com/boostorg/container/issues/234 GitHub #234: ['"dlmalloc_ext_2_8_6.c:warning: iteration 2305843009213693951 invokes undefined behavior"]].
 
 [endsect]
 

src/dlmalloc_ext_2_8_6.c

@@ -36,6 +36,8 @@
 #define FORCEINLINE inline
 #endif
 
+#define DLMALLOC_EXT_GCC_VERSION 
+
 #ifdef _MSC_VER
 #pragma warning (push)
 #pragma warning (disable : 4127)
@@ -47,6 +49,18 @@
 #pragma warning (disable : 4057) /*differs in indirection to slightly different base types from*/
 #pragma warning (disable : 4702) /*unreachable code*/
 #pragma warning (disable : 4127) /*conditional expression is constant*/
+#elif defined(__GNUC__)
+
+# if ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 48000)
+   //Disable false positives triggered by -Waggressive-loop-optimizations
+#  pragma GCC diagnostic ignored "-Waggressive-loop-optimizations"
+#  endif
+
+# if ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 46000)
+   //Disable false positives triggered by -Warray-bounds
+#  pragma GCC diagnostic ignored "-Warray-bounds"
+#  endif
+
 #endif
 
 #include "dlmalloc_2_8_6.c"