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Enable -Wtrampolines by default.
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -611,7 +611,7 @@ 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
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -3766,6 +3766,8 @@ headers---for that, @option{-Wunknown-pragmas} must also be used.
@opindex Wno-trampolines
Warn about trampolines generated for pointers to nested functions.
+ In Gentoo, @option{-Wtrampolines} is enabled by default.
+
A trampoline is a small piece of data or code that is created at run
time on the stack when the address of a nested function is taken, and
is used to call the nested function indirectly. For some targets, it
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