Error a storage class can only be specified for objects and functions

1. 11-16-2011

   
   

   #1

   

   
   Registered User
   

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   Compiler Error a storage class can only be specified for objects and functions
   

   I have some code that I’ve successfully compiled in a couple of compilers. I am now trying to use CodeBlocks with the GCC compiler. I have a header file that declares a number of structures that are used in a DLL. The declarations look like this:

   Code:

   extern struct structure1 {float var1, double var2, int var3};

   The numbers of variables in the structures and their precisions vary. But each one of them is generating the error in the tag line:

   a storage class can only be specified for objects and functions

   Why? How do I correct it? What is different between this compiler and something like VisualStudio where it builds successfully?

   Thank you, in advance, for your help and suggestions.

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2. 11-16-2011

   
   

   #2

   

   
   Registered User
   

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   extern is used to inform the compiler that a particular object (variable) exists somewhere else. It can also be used on functions, although there is no syntactic point to do so.

   You have neither an object/variable nor a function here, so extern is not allowed. As far as C is concerned, it has no meaning here. To fix it, remove the extern.

   Why does Visual Studio accept it? Who knows.

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3. 11-18-2011

   
   

   #3

   

   
   Registered User
   

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   Thank you. I removed the extern and, as you said, the error disappears. It is very interesting that Borland, VS and Pelles all pass by that issue.

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4. 11-18-2011

   
   

   #4

   

   
   Registered User
   

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   is that really your code? or did you accidentally put commas instead of semicolons? in either case it doesn’t compile in visual c 2010

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/*
 * stud.h
 *
 *  Created on: 12.11.2013
 *      Author: 
 */

//stud.h: Definition der Datenstruktur Stud
#ifndef _STUD_H
#define _STUD_H


struct Stud{
        long matrnr;
        char vorname[30];
        char name[30];
        char datum[30];
        float note;
    };

extern Stud mystud[];

int einlesen (struct Stud[]);
void bubbleSort(struct Stud[] , int );
void ausgeben(struct Stud[], int);

#endif

extern Stud mystud[];

extern struct Stud* mystud;

struct Stud stud_storage[SIZE];
struct Stud* mystud = stud_storage;

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c++

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The remaining compiler problems arise from notepad++ specific extensions, not from the original scintilla source code.

Most could be fixed by the change in WordList.h:
change:
void WordList::SetWordAt(int n, const char word2Set) {
to:
void SetWordAt(int n, const char word2Set) {

Explanation for «error: extra qualification» see here:
http://stackoverflow.com/questions/11692806/error-extra-qualification-student-on-member-student-fpermissive

The next one is in LexUser.cxx:

../lexers/LexUser.cxx:933:25: error: ‘>>’ should be ‘> >’ within a nested template argument list
Explanation for this error type see here:
http://stackoverflow.com/questions/6695261/template-within-template-why-should-be-within-a-nested-template-arg

Fix proposal:
change:
typedef vector<vector<string>> vvstring;
to:
typedef vector<vector<string> > vvstring;

Remaining problem in LexUser.cxx:
../lexers/LexUser.cxx:1657:47: error: third operand to the conditional operatoris of type ‘void’, but the second operand is neither a throw-expression nor of type ‘void’

This refers to the following for-loop syntax:
for (; finished; dontMove?true:sc.Forward())

Probably recent gcc versions do not like this syntax; see here:
http://compgroups.net/comp.lang.c++/minor-compiler-bug/1050777
Seems that the expression need to be replaced by an if-else ??

The next and last one is about LexSearchResult.cxx:
../lexers/LexSearchResult.cxx:43:86: error: a storage class can only be specified for objects and functions
and some others. — All that is caused by the statement:
static enum { searchHeaderLevel = SC_FOLDLEVELBASE + 1, fileHeaderLevel, resultLevel };
About that, see http://stackoverflow.com/questions/4971436/c-what-does-static-enum-mean
Or: http://forums.codeguru.com/showthread.php?357248-error-quot-storage-class-can-only-be-specified-for-objects-and-functions-quot
Fix proposal via last link: «You don’t need the static keyword there»

When building with --enable-fuzzing with GCC, I get the following error:

LibFuzzerTestHarness.h:78:1: error: a storage class can only be specified for objects and functions
static class ScopedXPCOM : public nsIDirectoryServiceProvider2
^~~~~~

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a storage class can only be specified for objects and functions

extern class Payments : public QObject
{
Q_OBJECT
public:
Payments(QObject *parent = 0);
virtual ~Payments();
void purchase(const QString &id, const QString &sku, const QString &name, const QString &metadata);
void getExisting(bool refresh);
void getPrice(const QString &id, const QString &sku);

public slots:
void purchaseResponse();
void existingPurchasesResponse();
void priceResponse();

signals:
void purchaseResponseSuccess(const QString &receiptString);
void existingPurchasesResponseSuccess(const QString &receiptsString);
void priceResponseSuccess(const QString &price);
void infoResponseError(int errorCode, const QString &errorText);private:
bb::platform::PaymentManager *paymentManager;

};

Решение

Другие решения

#ifndef INCLUDED_PAYMENTS
#define INCLUDED_PAYMENTS

// headers needed to define Payments

class Payments : public QObject
{
...
};

#endif INCLUDED_PAYMENTS