diff --git a/gcc/toplev.c b/gcc/toplev.c
index 1129281a09f..4804a11e385 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -601,6 +601,10 @@ int flag_gnu_linker = 1;
 /* Tag all structures with __attribute__(packed) */
 int flag_pack_struct = 0;
 
+/* Emit code to check for stack overflow; also may cause large objects
+   to be allocated dynamically.  */
+int flag_stack_check;
+
 /* Table of language-independent -f options.
    STRING is the option name.  VARIABLE is the address of the variable.
    ON_VALUE is the value to store in VARIABLE
@@ -655,6 +659,7 @@ struct { char *string; int *variable; int on_value;} f_options[] =
   {"verbose-asm", &flag_verbose_asm, 1},
   {"gnu-linker", &flag_gnu_linker, 1},
   {"pack-struct", &flag_pack_struct, 1},
+  {"stack-check", &flag_stack_check, 1},
   {"bytecode", &output_bytecode, 1}
 };