In G_fatal_error(): raise SIGSEGV if environment variable GRASS_SIGSEGV_ON_ERROR is set.

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@40532 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/gis/error.c

@@ -17,10 +17,10 @@
 #include <unistd.h>
 #include <time.h>
 #include <stdarg.h>
+#include <signal.h>
 #include <sys/types.h>
 #include <grass/glocale.h>
 #include <grass/gis.h>
-
 /*!
  * \def MSG
  *
@@ -159,6 +159,13 @@ void G_fatal_error(const char *msg, ...)
 
     G__call_error_handlers();
 
+    /* Raise SIGSEGV, useful for debugging only.
+     * Type "export GRASS_SIGSEGV_ON_ERROR=1"
+     * to enable this feature using bash.
+     */
+    if (getenv("GRASS_SIGSEGV_ON_ERROR"))
+        raise(SIGSEGV);
+
     exit(EXIT_FAILURE);
 }