|GNU Compiler Collection (GCC) Internals|
A back end for a target architecture in GCC has the following parts:
extra_optionsvariable in config.gcc. See Options.
__attribute__), including where the same attribute is already supported on some targets, which are enumerated in the manual.
libstdc++porting manual needs to be installed as info for this to work, or to be a chapter of this manual.
If the back end is added to the official GCC source repository, the following are also necessary: