revert detection of rtti and exceptions

This caused link errors in c++ code because it was not correct to pass
these flags to child codegens. And that was the only reason to detect
these flags. Otherwise we can safely rely on non-explicitly-detected
flag forwarding.

src-self-hosted/clang_options_data.zig

@@ -2554,14 +2554,7 @@ flagpd1("femulated-tls"),
 flagpd1("fencode-extended-block-signature"),
 sepd1("ferror-limit"),
 flagpd1("fescaping-block-tail-calls"),
-.{
-    .name = "fexceptions",
-    .syntax = .flag,
-    .zig_equivalent = .exceptions,
-    .pd1 = true,
-    .pd2 = false,
-    .psl = false,
-},
+flagpd1("fexceptions"),
 flagpd1("fexperimental-isel"),
 flagpd1("fexperimental-new-constant-interpreter"),
 flagpd1("fexperimental-new-pass-manager"),
@@ -2765,14 +2758,7 @@ flagpd1("fno-elide-type"),
 flagpd1("fno-eliminate-unused-debug-symbols"),
 flagpd1("fno-emulated-tls"),
 flagpd1("fno-escaping-block-tail-calls"),
-.{
-    .name = "fno-exceptions",
-    .syntax = .flag,
-    .zig_equivalent = .no_exceptions,
-    .pd1 = true,
-    .pd2 = false,
-    .psl = false,
-},
+flagpd1("fno-exceptions"),
 flagpd1("fno-experimental-isel"),
 flagpd1("fno-experimental-new-pass-manager"),
 flagpd1("fno-fast-math"),
@@ -2861,14 +2847,7 @@ flagpd1("fno-rewrite-includes"),
 flagpd1("fno-ropi"),
 flagpd1("fno-rounding-math"),
 flagpd1("fno-rtlib-add-rpath"),
-.{
-    .name = "fno-rtti",
-    .syntax = .flag,
-    .zig_equivalent = .no_rtti,
-    .pd1 = true,
-    .pd2 = false,
-    .psl = false,
-},
+flagpd1("fno-rtti"),
 flagpd1("fno-rtti-data"),
 flagpd1("fno-rwpi"),
 flagpd1("fno-sanitize-address-poison-custom-array-cookie"),
@@ -3016,14 +2995,7 @@ flagpd1("fno-frontend-optimize"),
 flagpd1("fropi"),
 flagpd1("frounding-math"),
 flagpd1("frtlib-add-rpath"),
-.{
-    .name = "frtti",
-    .syntax = .flag,
-    .zig_equivalent = .rtti,
-    .pd1 = true,
-    .pd2 = false,
-    .psl = false,
-},
+flagpd1("frtti"),
 flagpd1("frwpi"),
 flagpd1("fsanitize-address-globals-dead-stripping"),
 flagpd1("fsanitize-address-poison-custom-array-cookie"),

src-self-hosted/stage2.zig

@@ -1286,10 +1286,6 @@ pub const ClangArgIterator = extern struct {
         sanitize,
         linker_script,
         verbose_cmds,
-        exceptions,
-        no_exceptions,
-        rtti,
-        no_rtti,
         for_linker,
         linker_input_z,
     };

src/all_types.hpp

@@ -2262,8 +2262,6 @@ struct CodeGen {
     bool emit_asm;
     bool emit_llvm_ir;
     bool test_is_evented;
-    bool cpp_rtti;
-    bool cpp_exceptions;
     CodeModel code_model;
 
     Buf *root_out_name;

src/codegen.cpp

@@ -8784,8 +8784,6 @@ static Error define_builtin_compile_vars(CodeGen *g) {
     cache_bool(&cache_hash, g->is_test_build);
     cache_bool(&cache_hash, g->is_single_threaded);
     cache_bool(&cache_hash, g->test_is_evented);
-    cache_bool(&cache_hash, g->cpp_rtti);
-    cache_bool(&cache_hash, g->cpp_exceptions);
     cache_int(&cache_hash, g->code_model);
     cache_int(&cache_hash, g->zig_target->is_native_os);
     cache_int(&cache_hash, g->zig_target->is_native_cpu);
@@ -9259,14 +9257,6 @@ void add_cc_args(CodeGen *g, ZigList<const char *> &args, const char *out_dep_pa
         case CSourceKindAsm:
             break;
     }
-    if (source_kind == CSourceKindCpp) {
-        if (!g->cpp_rtti) {
-            args.append("-fno-rtti");
-        }
-        if (!g->cpp_exceptions) {
-            args.append("-fno-exceptions");
-        }
-    }
     for (size_t i = 0; i < g->zig_target->llvm_cpu_features_asm_len; i += 1) {
         args.append(g->zig_target->llvm_cpu_features_asm_ptr[i]);
     }
@@ -9714,8 +9704,6 @@ Error create_c_object_cache(CodeGen *g, CacheHash **out_cache_hash, bool verbose
     cache_bool(cache_hash, g->have_sanitize_c);
     cache_bool(cache_hash, want_valgrind_support(g));
     cache_bool(cache_hash, g->function_sections);
-    cache_bool(cache_hash, g->cpp_rtti);
-    cache_bool(cache_hash, g->cpp_exceptions);
     cache_int(cache_hash, g->code_model);
 
     for (size_t arg_i = 0; arg_i < g->clang_argv_len; arg_i += 1) {
@@ -10550,8 +10538,6 @@ static Error check_cache(CodeGen *g, Buf *manifest_dir, Buf *digest) {
     cache_bool(ch, g->emit_bin);
     cache_bool(ch, g->emit_llvm_ir);
     cache_bool(ch, g->emit_asm);
-    cache_bool(ch, g->cpp_rtti);
-    cache_bool(ch, g->cpp_exceptions);
     cache_usize(ch, g->version_major);
     cache_usize(ch, g->version_minor);
     cache_usize(ch, g->version_patch);
@@ -10856,8 +10842,6 @@ CodeGen *create_child_codegen(CodeGen *parent_gen, Buf *root_src_path, OutType o
         parent_gen->build_mode, parent_gen->zig_lib_dir, libc, get_global_cache_dir(), false, child_progress_node);
     child_gen->root_out_name = buf_create_from_str(name);
     child_gen->disable_gen_h = true;
-    child_gen->cpp_rtti = parent_gen->cpp_rtti;
-    child_gen->cpp_exceptions = parent_gen->cpp_exceptions;
     child_gen->want_stack_check = WantStackCheckDisabled;
     child_gen->want_sanitize_c = WantCSanitizeDisabled;
     child_gen->verbose_tokenize = parent_gen->verbose_tokenize;

src/main.cpp

@@ -458,8 +458,6 @@ static int main0(int argc, char **argv) {
     bool only_preprocess = false;
     bool ensure_libc_on_non_freestanding = false;
     bool ensure_libcpp_on_non_freestanding = false;
-    bool cpp_rtti = true;
-    bool cpp_exceptions = true;
 
     ZigList<const char *> llvm_argv = {0};
     llvm_argv.append("zig (LLVM option parsing)");
@@ -724,18 +722,6 @@ static int main0(int argc, char **argv) {
                     verbose_cc = true;
                     verbose_link = true;
                     break;
-                case Stage2ClangArgExceptions:
-                    cpp_exceptions = true;
-                    break;
-                case Stage2ClangArgNoExceptions:
-                    cpp_exceptions = false;
-                    break;
-                case Stage2ClangArgRtti:
-                    cpp_rtti = true;
-                    break;
-                case Stage2ClangArgNoRtti:
-                    cpp_rtti = false;
-                    break;
                 case Stage2ClangArgForLinker:
                     linker_args.append(buf_create_from_str(it.only_arg));
                     break;
@@ -1331,8 +1317,6 @@ static int main0(int argc, char **argv) {
             LinkLib *link_lib = codegen_add_link_lib(g, buf_create_from_str(link_libs.at(i)));
             link_lib->provided_explicitly = true;
         }
-        g->cpp_rtti = cpp_rtti;
-        g->cpp_exceptions = cpp_exceptions;
         g->subsystem = subsystem;
         g->valgrind_support = valgrind_support;
         g->want_pic = want_pic;
@@ -1481,8 +1465,6 @@ static int main0(int argc, char **argv) {
             }
             CodeGen *g = codegen_create(main_pkg_path, zig_root_source_file, &target, out_type, build_mode,
                     override_lib_dir, libc, cache_dir_buf, cmd == CmdTest, root_progress_node);
-            g->cpp_rtti = cpp_rtti;
-            g->cpp_exceptions = cpp_exceptions;
             if (llvm_argv.length >= 2) codegen_set_llvm_argv(g, llvm_argv.items + 1, llvm_argv.length - 2);
             g->valgrind_support = valgrind_support;
             g->link_eh_frame_hdr = link_eh_frame_hdr;

src/stage2.h

@@ -345,10 +345,6 @@ enum Stage2ClangArg {
     Stage2ClangArgSanitize,
     Stage2ClangArgLinkerScript,
     Stage2ClangArgVerboseCmds,
-    Stage2ClangArgExceptions,
-    Stage2ClangArgNoExceptions,
-    Stage2ClangArgRtti,
-    Stage2ClangArgNoRtti,
     Stage2ClangArgForLinker,
     Stage2ClangArgLinkerInputZ,
 };

tools/update_clang_options.zig

@@ -174,22 +174,6 @@ const known_options = [_]KnownOpt{
         .name = "###",
         .ident = "verbose_cmds",
     },
-    .{
-        .name = "fexceptions",
-        .ident = "exceptions",
-    },
-    .{
-        .name = "fno-exceptions",
-        .ident = "no_exceptions",
-    },
-    .{
-        .name = "frtti",
-        .ident = "rtti",
-    },
-    .{
-        .name = "fno-rtti",
-        .ident = "no_rtti",
-    },
 };
 
 const blacklisted_options = [_][]const u8{};