[clang][driver] Add -fno-visibility-inlines-hidden option

[kongyi]

Summary

This allows overriding -fvisibility-inlines-hidden.

Original change by andrewjcg, rebased to top of trunk.

[MaskRay]

clang/include/clang/Driver/Options.td

2679

Use NegFlag. Just add a driver option, avoid the CC1 option.

[MaskRay]

clang/lib/Driver/ToolChains/Clang.cpp

5647–5651

AddLastArg is not recommended for fno- if `fno- doesn't need to be a CC1 option.
The case below OPT_fvisibility_inlines_hidden_static_local_var is a workaround (will be deleted in few weeks) and should not be used as a reference.

[MaskRay]

clang/test/Driver/visibility-inlines-hidden.cpp

12

The two invocations are sufficient.

[MaskRay]

clang/test/Driver/visibility-inlines-hidden.cpp

10

I think there is little additional value testing both -fno- and -fpos- -fneg-. Testing the latter should be sufficient.

Other tests just use 2>&1 | FileCheck - it is more convenient though providing a bit less of guarantee (combined stdout/stderr instead of stderr) but we have dedicated tests for stderr testing. It's not this test file's responsibility for that.

16

This can be shared with CHECK-1.

[MaskRay]

clang/test/Driver/visibility-inlines-hidden.cpp

2

A common pattern is to place | either at the beginning of the continuation line or the end of the last line.
The continuation needs 2-column indentation.

clang/include/clang/Driver/Options.td

def fvisibility_externs_dllimport_EQ : Joined<["-"], "fvisibility-externs-dllimport=">, Group<f_Group>, Flags<[CC1Option]>,
   MarshallingInfoVisibility<LangOpts<"ExternDeclDLLImportVisibility">, "DefaultVisibility">,
   ShouldParseIf<fvisibility_from_dllstorageclass.KeyPath>;
 def fvisibility_externs_nodllstorageclass_EQ : Joined<["-"], "fvisibility-externs-nodllstorageclass=">, Group<f_Group>, Flags<[CC1Option]>,
   HelpText<"The visibility for external declarations without an explicit DLL dllstorageclass [-fvisibility-from-dllstorageclass]">,
   MarshallingInfoVisibility<LangOpts<"ExternDeclNoDLLStorageClassVisibility">, "HiddenVisibility">,
   ShouldParseIf<fvisibility_from_dllstorageclass.KeyPath>;
 def fvisibility_EQ : Joined<["-"], "fvisibility=">, Group<f_Group>,
   HelpText<"Set the default symbol visibility for all global declarations">, Values<"hidden,default">;
-def fvisibility_inlines_hidden : Flag<["-"], "fvisibility-inlines-hidden">, Group<f_Group>,
-  HelpText<"Give inline C++ member functions hidden visibility by default">,
-  Flags<[CC1Option]>, MarshallingInfoFlag<LangOpts<"InlineVisibilityHidden">>;
+defm visibility_inlines_hidden : BoolFOption<"visibility-inlines-hidden",
+  LangOpts<"InlineVisibilityHidden">, DefaultFalse,
+  PosFlag<SetTrue, [CC1Option], "Give inline C++ member functions hidden visibility by default">,
+  NegFlag<SetFalse>>;
 defm visibility_inlines_hidden_static_local_var : BoolFOption<"visibility-inlines-hidden-static-local-var",
   LangOpts<"VisibilityInlinesHiddenStaticLocalVar">, DefaultFalse,
   PosFlag<SetTrue, [CC1Option], "When -fvisibility-inlines-hidden is enabled, static variables in"
             " inline C++ member functions will also be given hidden visibility by default">,
   NegFlag<SetFalse, [], "Disables -fvisibility-inlines-hidden-static-local-var"
          " (this is the default on non-darwin targets)">, BothFlags<[CC1Option]>>;
 def fvisibility_ms_compat : Flag<["-"], "fvisibility-ms-compat">, Group<f_Group>,
   HelpText<"Give global types 'default' visibility and global functions and "

clang/lib/Driver/ToolChains/Clang.cpp

#endif
   if (const Arg *A = Args.getLastArg(options::OPT_mignore_xcoff_visibility)) {
     if (Triple.isOSAIX())
       CmdArgs.push_back("-mignore-xcoff-visibility");
     else
       D.Diag(diag::err_drv_unsupported_opt_for_target)
           << A->getAsString(Args) << TripleStr;
   }
 
-  Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden);
+
+  if (Args.hasFlag(options::OPT_fvisibility_inlines_hidden,
+                    options::OPT_fno_visibility_inlines_hidden, false))
+    CmdArgs.push_back("-fvisibility-inlines-hidden");
+
   Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden_static_local_var,
                            options::OPT_fno_visibility_inlines_hidden_static_local_var);
   Args.AddLastArg(CmdArgs, options::OPT_fvisibility_global_new_delete_hidden);
 
   Args.AddLastArg(CmdArgs, options::OPT_ftlsmodel_EQ);
 
   // Forward -f (flag) options which we can pass directly.
   Args.AddLastArg(CmdArgs, options::OPT_femit_all_decls);

clang/test/Driver/visibility-inlines-hidden.cpp

+// RUN: %clang -### -S -fno-visibility-inlines-hidden -fvisibility-inlines-hidden %s \
+// RUN: 2>&1 | FileCheck -check-prefix=CHECK-1 %s
+// CHECK-1: "-fvisibility-inlines-hidden"
+
+// RUN: %clang -### -S -fvisibility-inlines-hidden -fno-visibility-inlines-hidden %s \
+// RUN: 2>&1 | FileCheck -check-prefix=CHECK-2 %s
+// CHECK-2-NOT: "-fvisibility-inlines-hidden"