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This adds a warning switch for the existing "returning address of local variable" warnings in the C and C++ FEs which are enabled by default but have no switch controlling them. Adding a switch allows it to be turned into an error with -Werror=return-local-addr. I've added two tests checking the -Werror form works. gcc/c-family: PR c++/54930 * c.opt (Wreturn_local_addr): Define new option. gcc/c: PR c++/54930 * c-typeck.c (c_finish_return): Use OPT_Wreturn_local_addr. gcc/cp: PR c++/54930 * typeck.c (maybe_warn_about_returning_address_of_local): Use OPT_Wreturn_local_addr. gcc: PR c++/54930 * doc/invoke.texi (Warning Options): Document -Wno-return-local-addr. gcc/testsuite: PR c++/54930 * gcc.dg/Wreturn-local-addr.c: New. * g++.dg/warn/Wno-return-local-addr.C: New. * g++.dg/warn/Wreturn-local-addr.C: New. Tested x86_64-linux, OK for trunk?
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