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* c-common.h (has_c_linkage): New interface. * c-cppbuiltin.c: Include target.h. (c_cpp_builtins): Define __PRAGMA_REDEFINE_EXTNAME and __PRAGMA_EXTERN_PREFIX when appropriate. * c-pragma.c: Include target.h. Document clarified semantics of symbol-renaming #pragmas. (handle_pragma_redefine_extname, handle_pragma_extern_prefix) (maybe_apply_renaming_pragma): Rewrite according to clarified semantics. Always recognize, but do not necessarily execute. (init_pragma): Unconditionally register symbol-renaming pragmas. * system.h: Poison HANDLE_PRAGMA_REDEFINE_EXTNAME and HANDLE_PRAGMA_EXTERN_PREFIX. * target.h (struct gcc_target): Add handle_pragma_redefine_extname and handle_pragma_extern_prefix flags. * target-def.h: Add defaults for TARGET_HANDLE_PRAGMA_REDEFINE_EXTNAME and TARGET_HANDLE_PRAGMA_EXTERN_PREFIX. * Makefile.in (c-pragma.o, c-cppbuiltin.o): Update dependencies. * config/sol2.h: Define TARGET_HANDLE_PRAGMA_REDEFINE_EXTNAME, not HANDLE_PRAGMA_REDEFINE_EXTNAME. (TARGET_OS_CPP_BUILTINS): No need to define __PRAGMA_REDEFINE_EXTNAME. (TRANSFER_FROM_TRAMPOLINE): Prototype mprotect. * config/alpha/osf.h: Define TARGET_HANDLE_PRAGMA_EXTERN_PREFIX, not HANDLE_PRAGMA_EXTERN_PREFIX. (TARGET_OS_CPP_BUILTINS): No need to define __PRAGMA_EXTERN_PREFIX. * doc/extend.texi (Solaris Pragmas, Tru64 Pragmas): Combine into one section "Symbol-Renaming Pragmas"; clarify; document adjusted semantics. * builtins.c (expand_builtin): Do not issue error for a builtin with no special case code and no DECL_ASSEMBLER_NAME; just do the library call. * c-decl.c (builtin_function): Don't call make_decl_rtl. * c-objc-common.c (has_c_linkage): Stub implementation. * cgraphunit.c (cgraph_expand_function) (cgraph_remove_unreachable_nodes): Don't clear DECL_ARGUMENTS. cp: * cp-lang.c (has_c_linkage): Implement. * cp-tree.h (set_mangled_name_for_decl): Don't prototype. * decl.c (duplicate_decls): Use COPY_DECL_RTL. (builtin_function_1): Don't call make_decl_rtl. (build_cp_library_fn): Don't call set_mangled_name_for_decl. (grokvardecl): Don't call mangle_decl. * except.c (nothrow_libfn_p): Look at DECL_NAME, not DECL_ASSEMBLER_NAME. * method.c (set_mangled_name_for_decl): Delete. * name-lookup.c (pushdecl): When a local extern shadows a file-scope declaration of the same object, give both DECLs the same DECL_UID. * typeck.c (cxx_mark_addressable): Don't set TREE_ADDRESSABLE on DECL_ASSEMBLER_NAME. testsuite: * g++.dg/expr/enum1.C, g++.dg/opt/const3.C: Declare abort with extern "C". * g++.dg/other/pragma-re-1.C: Add comments. From-SVN: r83405
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