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I’m wondering where are gcc macros like builtin_expect , __attribute ((warn_unused_result)) etc. stored ? I needed to create a tag file with ctags , for things like those above.
Thanks !
_builtin_expect is a GCC builtin, this means that the compiler has some special code to handle it. It it nowhere really defined; if you care about its implementation, look inside the file
gcc/builtins.c(&builtins.def) of the GCC 4.6 (or future 4.7) compiler source code.Likewise,
__attribute__-s are handled by the compiler.The GCC documentation lists the set of builtins & attributes understood by GCC. Plugins (or MELT extensions) for GCC can augment it.