Brief crash output for exit() crashes

If a crash happens while exit() callbacks are being processed then just
output a bare minimum of info to stderr, since anything we might want to
reference would likely have been free'd, and we don't want to reference
free'd memory (plus information about the player, level and monsters
probably won't be of any help in tracking down a crash of that kind).

1 files changed, 7 insertions, 0 deletions

diff --git a/crawl-ref/source/stuff.cc b/crawl-ref/source/stuff.cc
index 9ca0204e12..d7f211bdea 100644
--- a/crawl-ref/source/stuff.cc
+++ b/crawl-ref/source/stuff.cc
@@ -356,6 +356,12 @@ void clear_globals_on_exit()
     clear_zap_info_on_exit();
 }
 
+// Used by do_crash_dump() to tell if the crash happened during exit() hooks.
+// Not a part of crawl_state, since that's a global C++ instance which is
+// free'd by exit() hooks when exit() is called, and we don't want to reference
+// free'd memory.
+bool CrawlIsExiting = false;
+
 void end(int exit_code, bool print_error, const char *format, ...)
 {
     std::string error = print_error? strerror(errno) : "";
@@ -395,6 +401,7 @@ void end(int exit_code, bool print_error, const char *format, ...)
     }
 #endif
 
+    CrawlIsExiting = true;
     exit(exit_code);
 }