[cfe-dev] clang finds errors in its own header files

[icloud via cfe-dev]

I am writing a parser for c++.

I am developing on a Mac. OS X Sierra 10.12.1

I am frustrated by the fact that I cannot compile even the simplest c++ 
code because clang 3.9 finds errors in the clang headers themselves! for 
example:

#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/ASTConsumers.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Tooling.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
#include <memory>


int main( void )
{
     return 0;
}


---

My output from running make is:

"/Applications/Xcode.app/Contents/Developer/usr/bin/make" -f 
nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
"/Applications/Xcode.app/Contents/Developer/usr/bin/make"  -f 
nbproject/Makefile-Debug.mk dist/Debug/CLang-MacOSX/parser
mkdir -p build/Debug/CLang-MacOSX
rm -f "build/Debug/CLang-MacOSX/main.o.d"
clang++    -c -g -I/usr/local/include -I/usr/include/c++/4.2.1 
-I/usr/include/c++/4.2.1 -std=c++14 -MMD -MP -MF 
"build/Debug/CLang-MacOSX/main.o.d" -o build/Debug/CLang-MacOSX/main.o 
main.cpp
In file included from main.cpp:2:
In file included from /usr/local/include/clang/AST/AST.h:18:
In file included from /usr/local/include/clang/AST/ASTContext.h:18:
In file included from /usr/local/include/clang/AST/ASTTypeTraits.h:20:
In file included from /usr/local/include/clang/AST/Decl.h:17:
In file included from /usr/local/include/clang/AST/APValue.h:17:
In file included from /usr/local/include/clang/Basic/LLVM.h:22:
In file included from /usr/local/include/llvm/Support/Casting.h:19:
In file included from /usr/local/include/llvm/Support/type_traits.h:18:
In file included from /usr/include/c++/4.2.1/utility:67:
/usr/include/c++/4.2.1/bits/stl_pair.h:96:22: error: unknown type name 
'pair'
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
                      ^
/usr/include/c++/4.2.1/bits/stl_pair.h:96:26: error: expected ')'
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
                          ^
/usr/include/c++/4.2.1/bits/stl_pair.h:96:15: note: to match this '('
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
               ^
/usr/include/c++/4.2.1/bits/stl_pair.h:97:14: error: use of undeclared 
identifier '__x'
     { return __x.first == __y.first && __x.second == __y.second; }
              ^
/usr/include/c++/4.2.1/bits/stl_pair.h:97:27: error: use of undeclared 
identifier '__y'
     { return __x.first == __y.first && __x.second == __y.second; }
                           ^
/usr/include/c++/4.2.1/bits/stl_pair.h:97:40: error: use of undeclared 
identifier '__x'
     { return __x.first == __y.first && __x.second == __y.second; }
                                        ^
/usr/include/c++/4.2.1/bits/stl_pair.h:97:54: error: use of undeclared 
identifier '__y'
     { return __x.first == __y.first && __x.second == __y.second; }
                                                      ^
/usr/include/c++/4.2.1/bits/stl_pair.h:102:21: error: unknown type name 
'pair'
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
                     ^
/usr/include/c++/4.2.1/bits/stl_pair.h:102:25: error: expected ')'
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
                         ^
/usr/include/c++/4.2.1/bits/stl_pair.h:102:14: note: to match this '('
     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
              ^
/usr/include/c++/4.2.1/bits/stl_pair.h:103:26: error: use of undeclared 
identifier '__y'; did you mean '__1'?
     { return __x.first < __y.first
                          ^
/usr/local/bin/../include/c++/v1/type_traits:393:1: note: '__1' declared 
here
_LIBCPP_BEGIN_NAMESPACE_STD
^
/usr/local/bin/../include/c++/v1/__config:353:69: note: expanded from 
macro '_LIBCPP_BEGIN_NAMESPACE_STD'
#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std {inline namespace 
_LIBCPP_NAMESPACE {
                                                                     ^
/usr/local/bin/../include/c++/v1/__config:67:27: note: expanded from 
macro '_LIBCPP_NAMESPACE'
#define _LIBCPP_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION)
                           ^
... and so on ... until:

fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [build/Debug/CLang-MacOSX/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2

If I were to take a completely wild stab in the dark I would say clang 
thinks I'm compiling C code, not C++.

maybe some missing extern "C"{  statements?

Help will be greatly appreciated.

-- 

Paul


-- 

Paul

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