c-common.c (struct disabled_builtin, [...]): New.
* c-common.c (struct disabled_builtin, disabled_builtins,
disable_builtin_function, builtin_function_disabled_p): New.
(builtin_function_2): Check for disabled built-in functions.
* c-common.h (disable_builtin_function): Declare.
* c-decl.c (c_decode_option): Handle -fno-builtin-FUNCTION.
* doc/invoke.texi: Document -fno-builtin-FUNCTION.
* doc/extend.texi: Mention -fno-builtin-FUNCTION.
testsuite:
* gcc.dg/no-builtin-1.c: New test.
From-SVN: r47133