Here is the simple echo.c source code:
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"#(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "#(#)echo.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: echo.c,v 1.7 1997/07/20 06:07:03 thorpej Exp $");
#endif
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main __P((int, char *[]));
int
main(argc, argv)
int argc;
char *argv[];
{
/*
*main code with no error at all
*/
}
When compiling it with gcc 4.4.6, it report errors:
echo.c:4: error: expected declaration specifiers or â...â before string constant
echo.c:3: warning: data definition has no type or storage class
echo.c:12: error: expected declaration specifiers or â...â before string constant
echo.c:12: warning: data definition has no type or storage class
Line 3 and 4 is __COPYRIGHT macro.
Line 12 is __RCSID macro.
If I delete these two macro, it compiles successfully and runs correctly.
After some googling, I know that these two macros are defined in sys/cdefs.h and they are some kind of comment message.
But why it won't compile in gcc?
Well after going throuhg sys/cdefs.h (ubuntu 11.10), I found no __COPYRIGHT or __RCSID defination.
So I guess these two macros are defined in NetBSD sys/cdefs.h.
I added them in a new header file (I name it with "aeodefs.h") like the following:
#ifndef _AEODEFS_H_
#define _AEODEFS_H_
#include <sys/cdefs.h>
#define __IDSTRING(name,string) \
static const char name[] __attribute__((__unused__)) = string
#ifndef __RCSID
#define __RCSID(s) __IDSTRING(rcsid,s)
#endif
#ifndef __COPYRIGHT
#define __COPYRIGHT(s) __IDSTRING(copyright,s)
#endif
#endif /* !_AEODEFS_H_ */
Then change #include <sys/cdefs.h> to #include "aeodefs.h".
It's done!
Related
I am trying to create a stack data type in C in Xcode, therefore using a stack init function.
The following is found in DeckStack.c
#define DS DeckStack
#include "DeckStack.h"
struct _DeckStack {
void *top;
void *cards[40];
};
DeckStack* stack_init(void) {
DS *new_deckStack = NULL;
new_deckStack = (DS*) malloc(sizeof(DS));
return new_deckStack;
}
But Xcode is complaining about the implicit declaration of malloc, yet stdlib.h is included in DeckStack.h:
#ifndef DeckStack_h
#define DeckStack_h
#include <stdio.h>
#include <stdlib.h>
typedef struct _DeckStack DeckStack;
/* #brief
* Creates a new deck
*/
DeckStack* stack_init(void);
#endif /* DeckStack_h */
Solved, just press enter a few times and the .c file will update itself with the contents of the header.
I want to compile a simple test project for a library that makes use of a ftd2xx driver. I already compiled it successfully on linux and I'm trying to do the same on Windows. The main difference are some minor modification to the library.
The test file I want to compile is this:
//#include "HPX-linux.h"
#include "HPX-Windows.h"
#include <stdlib.h>
#include <stdio.h>
int main(){
int devs;
getSerialNum(&devs);
printf("%d\n\n", devs);
simpleTest("./myTest/");
return 0;
}
And the preprocessing directives of HPX-Windows.h are as follows:
#ifndef HPXLINUX_H
#define HPXLINUX_H
#include <math.h>
#include <stdint.h>
#include <time.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include "ftd2xx.h"
#include <pthread.h>
// typedefs
//typedef uint16_t DWORD;
#ifndef __cplusplus
typedef uint8_t bool;
#endif
// static const defines
#ifndef __cplusplus
#define TRUE 1
#define FALSE 0
#endif
#define SUCCESS 0
#define FAILURE -1
#define RETRIEDTOOMANY -10
#define LOSTHEADFRAME -11
#define GOTAV 2
#ifdef __unix__
#define PRELIB extern
#elif _WIN32
#ifdef ADD_EXPORTS
#define PRELIB __declspec(dllexport)
#else
#define PRELIB __declspec(dllimport)
#endif
#endif
#ifdef __unix__
#define CALL
#elif _WIN32
#define CALL __cdecl
#endif
About ftd2xx, I have 2 .h headers, a .lib and a .dll.
With the driver properly installed, I could compile the library on linux with:
gcc -o test test.c -Wall -Wextra -lHPX-linux -lftd2xx -lm
I'm using MinGW on Windows. The command I'm using is:
gcc test.c HPX-Windows.c -L -lftd2xx -g
And then I get a list of errors type "undefined reference to _imp__*", being * a function. I expected them to be the functions of ftd2xx.h, but it also happens to function declared in HPX-Windows.h, including getSerialNum and simpleTest. Why does it happen when I'm using a .c source file instead of a library?
The error is caused by symbols exported with __declspec(dllimport) in header files that can't be imported from a shared library (.DLL).
I would recommend creating a libftd2xx.dll.a file from the ftd2xx.dll file and linking with that (e.g. if the files are in the current directory using -L. -lftd2xx.dll).
Or you could probably just link with the .dll file by specifying it in the gcc command, something like this: gcc -o test.exe test.c HPX-Windows.c ftd2xx.dll -g).
If that doesn't work check ftd2xx.h to see where __declspec(dllimport) is imported and see if you can set a define that causes the header to not use __declspec(dllexport)/__declspec(dllimport) and link with your lib file in case it's a static library (something like: gcc --static -o test.exe test.c HPX-Windows.c -L. -lftd2xx -g).
I am trying to compile (IDE:VS2008) the following project:
https://github.com/arpu/adscanner
As the project needs the ffmpeg libaries, I've downloaded the DEV version from here: http://ffmpeg.zeranoe.com/builds/
I've linked the library directions and added the headers to the include path.
Though I get the error message: ""ffmpeg/avcodec.h": No such file or directory"
Thank you in advance
PS: I've tried both the 64bit and 32bit library, neither worked. But how can I figure it out weather the github project is using the 32bit or 64bit ffmpeg version?
Change this in ffmpeg_movie.h
extern "C" {
#include <ffmpeg/avcodec.h>
#include <ffmpeg/avformat.h>
#include <ffmpeg/swscale.h>
}
to this
extern "C"{
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
}
and when i last used ffmpeg i had to add this
extern "C"{
#ifdef __cplusplus
#define __STDC_CONSTANT_MACROS
#ifdef _STDINT_H
#undef _STDINT_H
#endif
# include <stdint.h>
#endif
}
# include <stdio.h>
#ifndef INT64_C
#define INT64_C(c) (c ## LL)
#define UINT64_C(c) (c ## ULL)
#endif
I am building a parser but I have some errors that I could not solve them, I am nuw to bison and flex, please help me solve them and understand why they are happening here is my errors that I get:
lexical.l:3:20: error: common.h: No such file or directory
In file included from lexical.l:5:
bison.tab.h:81: error: expected â=â, â,â, â;â, âasmâ or â__attribute__â before âyylvalâ
bison.tab.c:1155: error: conflicting types for âyylvalâ
bison.tab.h:81: note: previous declaration of âyylvalâ was here
bison.y: In function âyyparseâ:
bison.y:96: error: incompatible types when assigning to type âSTYPEâ from type âNODEPTRâ
here is my parser file bison.y:
%{
#include <stdio.h>
#include "bison.tab.h"
#include "common.h"
//int yylex();
void yyerror (char const *);
typedef struct STYPE {
NODEPTR pointer;
} STYPE;
#define YYSTYPE STYPE
%}
/* Bison declarations. */
%token ELSE REAL INTEGER XWRITE WHILE END DO IF THEN XPROGRAM FUNCTION XRETURN XREAD VAR FOR XBEGIN CALL ID NUM
%token RELOP ADDOP MULOP ASSIGN AND OR NOT
%left '-' '+'
%left '*' '/'
%nonassoc LOWER_THAN_ELSE
%nonassoc ELSE
If you #define YYSTYPE in your bison file, you need to #define YYSTYPE also in your flex file, because bison doesn't put the #define into the generated header file. You need to do this before you #include the generated header file.
Bison doesn't put the #define in the generated header because it has no way of knowing whether you did, since you might do it in an included file. In fact, if you're going to #define YYSTYPE, you should do it in a common header file, and #include the common header file in both bison and flex programs (as above, before you include the bison-generated header file).
Also, when you're regenerating the generated code, remember to always generate the bison program first because the flex program depends on the generated header file. That's the opposite order to the way you are doing it.
Just to make all this a bit clearer, here's an example:
common.h:
struct MyType {
/* ... /
};
#define YYSTYPE struct MyType;
lexer.l:
%{
/* All your standard includes go here */
/* Must go in this order */
#include "common.h"
#include "bison.tab.h"
%}
bison.y:
%{
/* Whatever library includes you need */
#include "common.h"
/* Don't include bison.tab.h; it will get inserted automatically */
%}
To fix the yytext error add this to bison.y :-
extern char *yytext
To fix the yyerror error make your prototype at the top of bison.y match the defn below :-
int yyerror(const char *message);
Fixing the yylval error requires a little more work and I don't understand this well enough to help. I'd suggest trying a simple hello,world type lexer,parser and move forward from there.
Here is the common.h I used :-
typedef struct STYPE {
int pointer;
} STYPE;
And the header of lexer :-
%{
#include "common.h"
#define YYSTYPE STYPE
#include <stdio.h>
#include"bison.tab.h"
void showToken(char*);
%}
And the header of parser :-
%{
#include <stdio.h>
#include "common.h"
extern char *yytext;
#define YYSTYPE STYPE
%}
This gives me one error and a few warnings but those are due to the undefined functions. Note that I have moved the declaration of STYPE to the top of lexer and parser
I am trying to compile a relatively simple application that I obtained from the web..
When running make I get the following error:
In file included from main.cpp:2:0:
os.h: In function ‘void myOpenDir(const char*)’:
os.h:13:16: error: ‘chdir’ was not declared in this scope
The file os.h looks like this:
#ifndef OS_H
#define OS_H
#if defined(__GNUG__)
#define INT64 long long
#define UINT64 unsigned long long
#include <dirent.h>
#define SPRTR '/'
void myOpenDir(const char* dirpath)
{
chdir(dirpath);
}
#elif defined(_MSC_VER)
#define INT64 __int64
#define UINT64 unsigned __int64
#include <direct.h>
#define SPRTR '\\'
void myOpenDir(const char* dirpath)
{
_chdir(dirpath);
}
#else
#error "Platform not supported. Need to update source code"
#endif
#endif
Someone got an idea why it wont compile?
I also used a g++ compiler via g++-4.7.real -c main.cpp but so far no luck.
Add #include <unistd.h>, as per the chdir manual.