--- gcc/gcc/common.opt
+++ gcc/gcc/common.opt
@@ -712,7 +712,7 @@ Common Var(warn_system_headers) Warning
 Do not suppress warnings from system headers.
 
 Wtrampolines
-Common Var(warn_trampolines) Warning
+Common Var(warn_trampolines) Init(1) Warning
 Warn whenever a trampoline is generated.
 
 Wtype-limits
--- gcc/gcc/doc/invoke.texi
+++ gcc/gcc/doc/invoke.texi
@@ -4724,6 +4724,9 @@ made up of data only and thus requires no special treatment.  But, for
 most targets, it is made up of code and thus requires the stack to be
 made executable in order for the program to work properly.
 
+ NOTE: In ALT Linux gcc 4.9.2-alt3 and later versions this option is enabled
+ by default. To disable, use @option{-Wno-trampolines}.
+
 @item -Wfloat-equal
 @opindex Wfloat-equal
 @opindex Wno-float-equal