unable to parse header files

Hi everyone,

I would like to parse c++ files with clang. While the code below works for self written code, it generates error messages as soon as I include stdlib headers. Can you tell me what I’m doing wrong?

input.cpp:
#include “stdio.h”
#include
int main(){
std::map<int, int> m;
printf("%d",1);
return 0;
}

error messages:

/usr/include/c++/4.4/cstddef:50:11: error: no member named ‘ptrdiff_t’ in the global namespace
using ::ptrdiff_t;
~~^
/usr/include/c++/4.4/cstddef:51:11: error: no member named ‘size_t’ in the global namespace
using ::size_t;
~~^
In file included from test.cpp:2:
In file included from /usr/include/c++/4.4/map:59:
In file included from /usr/include/c++/4.4/bits/stl_tree.h:62:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:63:
/usr/include/c++/4.4/bits/cpp_type_traits.h:80:12: error: unknown type name ‘bool’
template
^
/usr/include/c++/4.4/bits/cpp_type_traits.h:85:25: error: use of undeclared identifier ‘true’
struct __truth_type

test.cpp:5:3: error: use of undeclared identifier ‘printf’
printf("%d",1);

main.cpp:
#include
#include “llvm/Support/raw_ostream.h”
#include “llvm/System/Host.h”
#include “clang/Frontend/DiagnosticOptions.h”
#include “clang/Frontend/TextDiagnosticPrinter.h”
#include “clang/Basic/LangOptions.h”
#include “clang/Basic/FileSystemOptions.h”
#include “clang/Basic/SourceManager.h”
#include “clang/Lex/HeaderSearch.h”
#include “clang/Basic/FileManager.h”
#include “clang/Frontend/HeaderSearchOptions.h”
#include “clang/Frontend/Utils.h”
#include “clang/Basic/TargetOptions.h”
#include “clang/Basic/TargetInfo.h”
#include “clang/Lex/Preprocessor.h”
#include “clang/Frontend/PreprocessorOptions.h”
#include “clang/Frontend/FrontendOptions.h”
#include “clang/Basic/IdentifierTable.h”
#include “clang/Basic/Builtins.h”
#include “clang/AST/ASTContext.h”
#include “clang/AST/ASTConsumer.h”
#include “clang/Sema/Sema.h”
#include “clang/AST/DeclBase.h”
#include “clang/AST/Type.h”
#include “clang/AST/Decl.h”
#include “clang/Sema/Lookup.h”
#include “clang/Sema/Ownership.h”
#include “clang/AST/DeclGroup.h”
#include “clang/Parse/Parser.h”
#include “clang/Parse/ParseAST.h”

int main()
{
clang::DiagnosticOptions diagnosticOptions;
llvm::IntrusiveRefCntPtrclang::DiagnosticIDs pDiagIDs;
clang::TextDiagnosticPrinter *pTextDiagnosticPrinter =
new clang::TextDiagnosticPrinter(llvm::outs(), diagnosticOptions);
clang::Diagnostic diagnostic(pDiagIDs, pTextDiagnosticPrinter);

clang::LangOptions languageOptions;
languageOptions.CPlusPlus= 1;

clang::FileSystemOptions fileSystemOptions;
clang::FileManager fileManager(fileSystemOptions);
clang::SourceManager sourceManager(diagnostic, fileManager);

clang::HeaderSearch headerSearch(fileManager);
clang::HeaderSearchOptions headerSearchOptions;
headerSearchOptions.AddPath("/usr/include/linux",
clang::frontend::Angled,
false,
false,
false);
headerSearchOptions.AddPath("/usr/include/c++/4.4",
clang::frontend::Angled,
false,
false,
false);

headerSearchOptions.AddPath("/usr/include/c++/4.4/tr1",
clang::frontend::Angled,
false,
false,
false);

clang::TargetOptions targetOptions;
targetOptions.Triple = llvm::sys::getHostTriple();

clang::TargetInfo *pTargetInfo =
clang::TargetInfo::CreateTargetInfo(
diagnostic,
targetOptions);

clang::ApplyHeaderSearchOptions(
headerSearch,
headerSearchOptions,
languageOptions,
pTargetInfo->getTriple());

clang::Preprocessor preprocessor(
diagnostic,
languageOptions,
*pTargetInfo,
sourceManager,
headerSearch);

clang::PreprocessorOptions preprocessorOptions;
clang::FrontendOptions frontendOptions;
clang::InitializePreprocessor(
preprocessor,
preprocessorOptions,
headerSearchOptions,
frontendOptions);
const clang::FileEntry *pFile = fileManager.getFile(“test.cpp”);
sourceManager.createMainFileID(pFile);

const clang::TargetInfo &targetInfo = *pTargetInfo;

clang::IdentifierTable identifierTable(languageOptions);
clang::SelectorTable selectorTable;

clang::Builtin::Context builtinContext(targetInfo);
clang::ASTContext astContext(
languageOptions,
sourceManager,
targetInfo,
identifierTable,
selectorTable,
builtinContext,
0);
clang::ASTConsumer astConsumer;
pTextDiagnosticPrinter->BeginSourceFile(languageOptions, &preprocessor);
clang::ParseAST(preprocessor, &astConsumer, astContext);

pTextDiagnosticPrinter->EndSourceFile();

return 0;
}

thanks, Alex

Hi Alex,

/usr/include/c++/4.4/cstddef:50:11: error: no member named 'ptrdiff_t' in
the global namespace
  using ::ptrdiff_t;
        ~~^
/usr/include/c++/4.4/cstddef:51:11: error: no member named 'size_t' in the
global namespace
  using ::size_t;
        ~~^

You need to set HeaderSearchOptions::ResourceDir so that Clang can
find its own header files including stddef.h. It's proably picking
up another stddef.h here which does not define the symbols correctly.
Something like this (CLANG_VERSION_STRING is defined by the header
but you need to define LLVM_PREFIX yourself, which is the LLVM/Clang
installation prefix):

#include "clang/Basic/Version.h"
...
headerSearchOptions.ResourceDir = LLVM_PREFIX "/lib/clang/" CLANG_VERSION_STRING;

In file included from test.cpp:2:
In file included from /usr/include/c++/4.4/map:59:
In file included from /usr/include/c++/4.4/bits/stl_tree.h:62:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:63:
/usr/include/c++/4.4/bits/cpp_type_traits.h:80:12: error: unknown type name
'bool'
  template<bool>
           ^
/usr/include/c++/4.4/bits/cpp_type_traits.h:85:25: error: use of undeclared
identifier 'true'
    struct __truth_type<true>

From your code:
    languageOptions.CPlusPlus= 1;

You need to set other language options for C++, including
LangOptions::Bool. You can set all the correct language options
automatically using CompilerInvocation::setLangDefaults:

CompilerInvocation::setLangDefaults(languageOptions, IK_CXX);

Thanks,