On 2018-06-06 02:02 +0800, 李宗霖 wrote: > Hello, > > I'm a gcc beginner from Taiwan. > Nice to meet you. > > I would like to add some new rule into compiler so that it can detect the > extra error/warning. > But I don't know which file is the one do the action. > Can you give some advice about the relationship of gcc files? info gccint. Though it is quite outdated :( Generally at first you should add an option like "Wfoo" in common.opt or other (language specific) opt file, for e.g.: Wfoo Common Var(flag_warn_foo) Warning Warn about misusage of foo. Then you can get the value of this option from the variable flag_warn_foo in (auto generated) options.h. Then just implement the warning option (call warning_at to output the diagnostic) in language FE or the middle end. At last add a test for -Wfoo in gcc/testsuite/gcc.dg (for C) or gcc/testsuite/g++.dg (for C++). Now you can build modified GCC and run the testsuite to make sure there is no regression, and -Wfoo is working properly. -- Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
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