[PATCH] [ASan/Win] Don't crash when ASAN_OPTIONS have disable_core=1

[Timur Iskhodzhanov]

Hi kcc,

http://reviews.llvm.org/D3610

Files:
  lib/asan/asan_rtl.cc
  lib/sanitizer_common/sanitizer_win.cc

Index: lib/asan/asan_rtl.cc
===================================================================
--- lib/asan/asan_rtl.cc
+++ lib/asan/asan_rtl.cc
@@ -178,7 +178,8 @@
 
   ParseFlag(str, &f->disable_core, "disable_core",
       "Disable core dumping. By default, disable_core=1 on 64-bit to avoid "
-      "dumping a 16T+ core file.");
+      "dumping a 16T+ core file. "
+      "Ignored on architectures that don't dump core by default.");
 
   ParseFlag(str, &f->allow_reexec, "allow_reexec",
       "Allow the tool to re-exec the program. This may interfere badly with "
Index: lib/sanitizer_common/sanitizer_win.cc
===================================================================
--- lib/sanitizer_common/sanitizer_win.cc
+++ lib/sanitizer_common/sanitizer_win.cc
@@ -185,7 +185,7 @@
 }
 
 void DisableCoreDumper() {
-  UNIMPLEMENTED();
+  // Do nothing.
 }
 
 void ReExec() {
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