Querying a compiler switch setting in clang

Nat · August 26, 2015, 12:22pm

Hi

I would like to query at certain points in unfortunately various files
like SemaExpr.cpp or CGCall.cpp the value of a compiler flag and branch
accordingly to custom code.

The specific flag I want to query the value of is -fobjc-runtime.

I have now spent some time in various corners of clang, certainly not
all, but I haven't come across that yet, except possibly LangOptions. Maybe extending LangOptions would be the best place, but I don't know.

Thanks for a clue.

Ciao
Nat!

jroelofs · August 26, 2015, 2:24pm

Hi

I would like to query at certain points in unfortunately various files
like SemaExpr.cpp or CGCall.cpp the value of a compiler flag and branch
accordingly to custom code.

The specific flag I want to query the value of is -fobjc-runtime.

I have now spent some time in various corners of clang, certainly not
all, but I haven't come across that yet, except possibly LangOptions.
Maybe extending LangOptions would be the best place, but I don't know.

LangOptions already has a field in it for this, called ObjCRuntime.

github.com

llvm-mirror/clang/blob/master/include/clang/Basic/LangOptions.h#L85

      
        
              CMK_None,
            
            
  /// Compiling a module from a module map.
              CMK_ModuleMap,
            
            
  /// Compiling a module from a list of header files.
              CMK_HeaderModule,
            
            
  /// Compiling a C++ modules TS module interface unit.
              CMK_ModuleInterface,
            };
            
            
enum PragmaMSPointersToMembersKind {
              PPTMK_BestCase,
              PPTMK_FullGeneralitySingleInheritance,
              PPTMK_FullGeneralityMultipleInheritance,
              PPTMK_FullGeneralityVirtualInheritance
            };
            
            
enum DefaultCallingConvention {
              DCC_None,

github.com

llvm-mirror/clang/blob/master/include/clang/Basic/ObjCRuntime.h

//===- ObjCRuntime.h - Objective-C Runtime Configuration --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Defines types useful for describing an Objective-C runtime.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_BASIC_OBJCRUNTIME_H
#define LLVM_CLANG_BASIC_OBJCRUNTIME_H

#include "clang/Basic/LLVM.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/ErrorHandling.h"

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Jon