c++ - Using gcc attributes with C++11 attributes syntax -

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i trying use gcc attributes c++11 syntax. example this:

static void [[used]] foo(void) {     // ... }

but following:

warning: ‘used’ attribute ignored [-wattributes] static void [[used]] foo(void)             ^

why attribute ignored? possible use gcc attributes c++ attributes?

[[gnu::used]] static void foo(void) {}

first, attribute can appear in specific places, otherwise get:

x.cc:1:13: warning: attribute ignored [-wattributes]  static void [[gnu::used]] foo(void) {}              ^ x.cc:1:13: note: attribute appertains type-specifier ignored

second, used not standard warning, gets hidden in proprietary namespace gnu::.


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