Added IM_DEBUG_BREAK() handler for GCC+AArch64/ARM64.

docs/CHANGELOG.txt

@@ -80,6 +80,8 @@ Other Changes:
 - Demo:
   - Extract 'Widgets->Tree Nodes->Selectable Nodes' out of the 'Advanced'
     demo for clarity (manual reimplementation of basic selection).
+- Misc:
+  - Added IM_DEBUG_BREAK() handler for GCC+AArch64/ARM64. [@tom-seddon]
 - Backends:
   - OpenGL3:
     - GLSL version detection assume GLSL 410 when GL context is 4.1.

imconfig.h

@@ -55,7 +55,7 @@
 //#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
 
 //---- Enable Test Engine / Automation features.
-//#define IMGUI_ENABLE_TEST_ENGINE                          // Enable imgui_test_engine hooks. Generally set automatically by include "imgui_te_config.h", see Test Engine for details.
+//#define IMGUI_ENABLE_TEST_ENGINE                          // Enable imgui_test_engine hooks. Generally set automatically by include "imgui_te_imconfig.h", see Test Engine for details.
 
 //---- Include imgui_user.h at the end of imgui.h as a convenience
 // May be convenient for some users to only explicitly include vanilla imgui.h and have extra stuff included.

imgui_internal.h

@@ -322,6 +322,8 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 #define IM_DEBUG_BREAK()    __asm__ volatile(".inst 0xde01")
 #elif defined(__GNUC__) && defined(__arm__) && !defined(__thumb__)
 #define IM_DEBUG_BREAK()    __asm__ volatile(".inst 0xe7f001f0")
+#elif defined(__GNUC__) && defined(__aarch64__)
+#define IM_DEBUG_BREAK()    __asm__ volatile(".inst 0xd4200000")    // GDB needs 'set $pc=($pc+4)' to skip this :(
 #else
 #define IM_DEBUG_BREAK()    IM_ASSERT(0)    // It is expected that you define IM_DEBUG_BREAK() into something that will break nicely in a debugger!
 #endif