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Re: libstdc++: compiling with iostream header: error: unknown type name 'char_traits'
On Sun, Jun 20, 2010 at 7:13 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> On 20 June 2010 10:14, Paolo Carlini <paolo.carlini@oracle.com> wrote:
>> On 06/20/2010 07:33 AM, Nobin Mathew wrote:
>>> Please help even if this is a dump question, I am new to the land of c++.
>>>
>> To be clear, the libstdc++ mailing list is about the *development* of
>> the library, is not a generic help list whatsoever.
>
> Which means cross-posting to libstdc++ and gcc-help is not appropriate.
Sorry for the trouble, this was not intentional.
>
> It's possible that there is a bug in the libstdc++ headers which is
> picked up by clang and not by g++, but since you didn't post a
> complete testcase that case be inspected, there's no way to know.
pasted below
>
> If you think there's a bug, please provide a complete testcase
> demonstrating it, either on the libstdc++ list or following these
> instructions: http://gcc.gnu.org/bugs/
>
> If you have a basic question about using gcc please follow-up on the
> gcc-help list.
>
>>> iosfwd uses uses char_traits but bits/char_traits.h is included after
>>> iosfwd in ios header
>
> That shouldn't matter, char_traits is declared in bits/stringfwd.h not
> bits/char_traits.h
>
#./a.out /home/nmathew/Desktop/algorithms/array.cpp gives
#include <...> search starts here:
/usr/include/linux
/usr/lib/gcc/i686-redhat-linux/4.4.3/include
/usr/include/c++/4.4.3
/usr/include/c++/4.4.3/backward
/usr/include/c++/4.4.3/i686-redhat-linux
/usr/local/include
/usr/include
End of search list.
*** HeaderSearch Stats:
0 files tracked.
0 #import/#pragma once files.
0 included exactly once.
0 max times a file is included.
0 #include/#include_next/#import.
0 #includes skipped due to the multi-include optimization.
0 framework lookups.
0 subframework lookups.
*** Preprocessor Stats:
0 directives found:
0 #define.
0 #undef.
#include/#include_next/#import:
2 source files entered.
0 max include stack depth
0 #if/#ifndef/#ifdef.
0 #else/#elif.
0 #endif.
0 #pragma.
0 #if/#ifndef#ifdef regions skipped
0/0/0 obj/fn/builtin macros expanded, 0 on the fast path.
0 token paste (##) operations performed, 0 on the fast path.
In file included from /home/nmathew/Desktop/algorithms/array.cpp:2:
In file included from /usr/include/c++/4.4.3/iostream:39:
In file included from /usr/include/c++/4.4.3/ostream:39:
In file included from /usr/include/c++/4.4.3/ios:38:
In file included from /usr/include/c++/4.4.3/iosfwd:40:
/usr/include/c++/4.4.3/bits/stringfwd.h:49:48: error: unknown type
name 'char_traits'
a.out: TextDiagnosticPrinter.cpp:293: void
clang::TextDiagnosticPrinter::EmitCaretDiagnostic(clang::SourceLocation,
clang::SourceRange*, unsigned int, const clang::SourceManager&, const
clang::FixItHint*, unsigned int, unsigned int, unsigned int, unsigned
int, unsigned int): Assertion `LangOpts && "Unexpected diagnostic
outside source file processing"' failed.
Stack dump:
0. /usr/include/c++/4.4.3/bits/stringfwd.h:49:48: current parser token
'char_traits'
1. /usr/include/c++/4.4.3/bits/stringfwd.h:41:1
<Spelling=/usr/include/c++/4.4.3/i686-redhat-linux/bits/c++config.h:114:38>:
parsing namespace
Aborted (core dumped)
I think in stringfwd.h _GLIBCXX_BEGIN_NAMESPACE(std) is parsed for the
first time.
My complete program is below.
File tut01_pp.cpp
#include "PPContext.h"
int main(int argc, char *argv[])
{
if (argc != 2)
{
cerr << "No File input " << endl;
return 0;
}
PPContext scope;
scope.headers.PrintStats();
const FileEntry *File = scope.fm.getFile(argv[1]);
if(!File)
{
cerr << "File Open Failed\t" << argv[1] << endl;
return 0;
}
scope.sm.createMainFileID(File, SourceLocation());
scope.pp->EnterMainSourceFile();
IdentifierTable identitab(scope.lang);
MinimalAction action(*(scope.pp));
Parser parse(*(scope.pp), action);
parse.ParseTranslationUnit();
identitab.PrintStats();
return 0;
}
File PPContext.h
#ifndef PP_CONTEXT
#define PP_CONTEXT
#include <iostream>
#include <string>
using namespace std;
#include <llvm/Support/raw_ostream.h>
#include <clang/Basic/Diagnostic.h>
#include <clang/Basic/TargetInfo.h>
#include <clang/Basic/TargetOptions.h>
#include <clang/Basic/FileManager.h>
#include <clang/Basic/SourceManager.h>
#include <clang/Lex/Preprocessor.h>
#include <clang/Lex/HeaderSearch.h>
#include <clang/Frontend/Utils.h>
#include <clang/Frontend/TextDiagnosticPrinter.h>
#include <clang/Frontend/DiagnosticOptions.h>
#include <clang/Frontend/HeaderSearchOptions.h>
#include <clang/Parse/Action.h>
#include <clang/Parse/Parser.h>
#include "llvm/System/Host.h"
using namespace clang;
using namespace llvm;
struct PPContext {
PPContext():tdp(ost, options), diag(&tdp), sm(diag), headers(fm)
{
TargetOptions target_options;
target_options.Triple = sys::getHostTriple();
target_options.CXXABI = "itanium";
target = TargetInfo::CreateTargetInfo(diag, target_options);
lang.CPlusPlus = 1;
pp = new Preprocessor(diag, lang, *target, sm, headers);
headeropts.EnvIncPath = "/usr/include/linux";
headeropts.CXXEnvIncPath =
"/usr/lib/gcc/i686-redhat-linux/4.4.3/include/";
headeropts.Verbose = 1;
ApplyHeaderSearchOptions(headers, headeropts, lang,
llvm::Triple(target_options.Triple));
};
~PPContext()
{
delete pp;
delete target;
};
llvm::raw_stdout_ostream ost;
const DiagnosticOptions options;
TextDiagnosticPrinter tdp;
Diagnostic diag;
LangOptions lang;
SourceManager sm;
FileManager fm;
HeaderSearch headers;
TargetInfo *target;
Preprocessor *pp;
HeaderSearchOptions headeropts;
};
#endif //#ifndef PP_CONTEXT
File array.cpp
#include <iostream>
#include "array.h"
using namespace std;
template <class gen>
ARRAY<gen>::ARRAY()
{
size = MAX;
ptr = (gen (*)[MAX])new gen[size];
}
template <class gen>
ARRAY<gen>::ARRAY(int array_size)
{
size = array_size;
ptr = (gen (*)[])new gen[size];
}
template <class gen>
ARRAY<gen>::~ARRAY()
{
delete (gen (*)[MAX])ptr;
}
template <class gen>
int ARRAY<gen>::getsize()
{
return size;
}
template <class gen>
ARRAY<gen>::ARRAY(const ARRAY &orig)
{
ptr = (gen (*)[MAX])new gen[orig.size];
memcpy(ptr, orig.ptr, sizeof(gen)*orig.size);
size = orig.size;
}
template <class gen>
gen& ARRAY<gen>::operator [](unsigned int index)
{
return *ptr[index];
}
int main(void)
{
ARRAY <int> intarray;
intarray[8] = 16;
return 0;
}
File array.h
#define MAX 10
template <class gen>
class ARRAY
{
public:
ARRAY();
ARRAY(int array_size);
~ARRAY();
ARRAY(const ARRAY &orig); //Copy constructor
gen& operator [] (unsigned int index);
int getsize(void);
private:
int size;
gen (*ptr)[MAX];
};
[nmathew@Alchemist cppscope]$ gcc -v
Using built-in specs.
Target: i686-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada
--enable-java-awt=gtk --disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--disable-libjava-multilib --with-ppl --with-cloog --with-tune=generic
--with-arch=i686 --build=i686-redhat-linux
Thread model: posix
gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC)
[nmathew@Alchemist cppscope]$
Thanks
Nobin