Index: clang/include/clang/Basic/LangOptions.def =================================================================== --- clang/include/clang/Basic/LangOptions.def +++ clang/include/clang/Basic/LangOptions.def @@ -225,6 +225,7 @@ BENIGN_LANGOPT(DumpVTableLayouts , 1, 0, "dumping the layouts of emitted vtables") LANGOPT(NoConstantCFStrings , 1, 0, "no constant CoreFoundation strings") BENIGN_LANGOPT(InlineVisibilityHidden , 1, 0, "hidden default visibility for inline C++ methods") +BENIGN_LANGOPT(GlobalAllocationFunctionVisibilityHidden , 1, 0, "hidden default visibility for global operator new and delete declaration") BENIGN_LANGOPT(ParseUnknownAnytype, 1, 0, "__unknown_anytype") BENIGN_LANGOPT(DebuggerSupport , 1, 0, "debugger support") BENIGN_LANGOPT(DebuggerCastResultToId, 1, 0, "for 'po' in the debugger, cast the result to id if it is of unknown type") Index: clang/include/clang/Driver/Options.td =================================================================== --- clang/include/clang/Driver/Options.td +++ clang/include/clang/Driver/Options.td @@ -1724,6 +1724,8 @@ def fvisibility_ms_compat : Flag<["-"], "fvisibility-ms-compat">, Group, HelpText<"Give global types 'default' visibility and global functions and " "variables 'hidden' visibility by default">; +def fvisibility_global_new_delete_hidden : Flag<["-"], "fvisibility-global-new-delete-hidden">, Group, + HelpText<"Give global C++ operator new and delete declarations hidden visibility by default">, Flags<[CC1Option]>; def fwhole_program_vtables : Flag<["-"], "fwhole-program-vtables">, Group, Flags<[CoreOption, CC1Option]>, HelpText<"Enables whole-program vtable optimization. Requires -flto">; Index: clang/lib/Driver/ToolChains/Clang.cpp =================================================================== --- clang/lib/Driver/ToolChains/Clang.cpp +++ clang/lib/Driver/ToolChains/Clang.cpp @@ -4258,6 +4258,7 @@ } Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden); + Args.AddLastArg(CmdArgs, options::OPT_fvisibility_global_new_delete_hidden); Args.AddLastArg(CmdArgs, options::OPT_ftlsmodel_EQ); Index: clang/lib/Frontend/CompilerInvocation.cpp =================================================================== --- clang/lib/Frontend/CompilerInvocation.cpp +++ clang/lib/Frontend/CompilerInvocation.cpp @@ -2350,6 +2350,9 @@ if (Args.hasArg(OPT_fvisibility_inlines_hidden)) Opts.InlineVisibilityHidden = 1; + if (Args.hasArg(OPT_fvisibility_global_new_delete_hidden)) + Opts.GlobalAllocationFunctionVisibilityHidden = 1; + if (Args.hasArg(OPT_ftrapv)) { Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping); // Set the handler, if one is specified. Index: clang/lib/Sema/SemaExprCXX.cpp =================================================================== --- clang/lib/Sema/SemaExprCXX.cpp +++ clang/lib/Sema/SemaExprCXX.cpp @@ -2816,9 +2816,10 @@ // Global allocation functions should always be visible. Alloc->setVisibleDespiteOwningModule(); - // Implicit sized deallocation functions always have default visibility. - Alloc->addAttr( - VisibilityAttr::CreateImplicit(Context, VisibilityAttr::Default)); + Alloc->addAttr(VisibilityAttr::CreateImplicit( + Context, LangOpts.GlobalAllocationFunctionVisibilityHidden + ? VisibilityAttr::Hidden + : VisibilityAttr::Default)); llvm::SmallVector ParamDecls; for (QualType T : Params) {