typedef struct using tcc (tiny c compiler)

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sleepsleep

Joined: 05 Oct 2006
Posts: 13800
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sleepsleep 06 Aug 2009, 21:35

i am pondering regarding its results.

Code:

#include <stdio.h>
#include <stdlib.h>

struct account {
 int no;
     char name[20];
};

typedef struct _car {
 int no;
     char name[20];
} car;

typedef struct _lorry {
   int no;
     char name[20];
} lorry, *lorry;

int main(void) {

    struct account s;
   s.no = 405;
 printf("%lu \n", s.no);
  printf("sizeof s = %lu \n", sizeof(s));

      car m;
      m.no = 321;
 printf("%lu \n", m.no);
  printf("sizeof m = %lu \n", sizeof(m));

      lorry *l;
   printf("sizeof *l = %lu \n", sizeof(*l));
        printf("sizeof l = %lu \n", sizeof(l));

      lorry c;
    printf("sizeof c = %lu \n", sizeof(c));

      return(0);
}

the result is

Code:

405
sizeof s = 24
321
sizeof m = 24
sizeof *l = 4
sizeof l = 4
sizeof c = 4

i am quite certain that the sizeof c should be 24. (same as sizeof m).
is this compiler error somehow?

06 Aug 2009, 21:35

sleepsleep 06 Aug 2009, 21:40

i think somehow i found the reason.
tcc doesn't throw warning or error on conflicting types.

Code:

typedef struct _lorry {
        int no;
        char name[20];
} lorry, *plorry;

would make c = 24;

06 Aug 2009, 21:40

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 07 Aug 2009, 07:53

That typedef immediately struck me. Got to try it with some normal C compiler.

07 Aug 2009, 07:53

jack2

Joined: 06 Jul 2008
Posts: 37

jack2 07 Aug 2009, 13:17

in visual studio 2005 I get

Quote:

405
sizeof s = 24
321
sizeof m = 24
sizeof *l = 24
sizeof l = 4
sizeof c = 24

btw, had to remove *lorry from

Code:

typedef struct _lorry { 
        int no; 
        char name[20]; 
} lorry, *lorry;

because i get

Quote:

error C2040: 'lorry' : '_lorry *' differs in levels of indirection from '_lorry'

07 Aug 2009, 13:17

f0dder

Joined: 19 Feb 2004
Posts: 3174
Location: Denmark

f0dder 07 Aug 2009, 14:00

Why keep on using TCC instead of a decent compiler?

07 Aug 2009, 14:00

windwakr

Joined: 30 Jun 2004
Posts: 827

windwakr 07 Aug 2009, 14:18

What other compiler takes under a megabyte of space unpacked and doesn't have to install itself?

BTW:
It's called a Truck. Seriously, "Jolly good day, did you see that lorry go by?". Those englanders have the weirdest words and phrases.

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07 Aug 2009, 14:18

sleepsleep 07 Aug 2009, 16:54

Quote:

Why keep on using TCC instead of a decent compiler?

i actually thought of using PCC too, since openbsd dev wanna uses them, it won't be wrong, but couldn't find the win32 version.
http://en.wikipedia.org/wiki/Portable_C_Compiler

windwakr wrote:

those tiny small words

yeah, those englanders.
lorry. even the national language here in my country, borrow this word directly.

lorry = lori

07 Aug 2009, 16:54

windwakr

Joined: 30 Jun 2004
Posts: 827

windwakr 07 Aug 2009, 17:33

this?
http://pcc.ludd.ltu.se/supported-platforms/
http://pcc.ludd.ltu.se/ftp/pub/win32/
Google is your friend.

EDIT2: Ok, forget my last edit(that is, if you read it). Download this file. http://pcc.ludd.ltu.se/ftp/pub/win32/pcc-20090408-win32.exe

Ok, lorry to us is strange. But I bet some of our words are probably strange to you.

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Last edited by windwakr on 07 Aug 2009, 17:43; edited 1 time in total

07 Aug 2009, 17:33

sleepsleep 07 Aug 2009, 17:41

weird, why they hide this information in their download page.
http://pcc.ludd.ltu.se/downloads/

yeah, strange, btw, i think you just introduce fasm board with new message encryption utility, size=1 Laughing

07 Aug 2009, 17:41

windwakr

Joined: 30 Jun 2004
Posts: 827

windwakr 07 Aug 2009, 17:55

It IS a wiki, you could sign up and add the links yourself.

I haven't introduced anything, me and many others have been using size=1 for years.

_________________
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07 Aug 2009, 17:55

Endre

Joined: 29 Dec 2003
Posts: 215
Location: Budapest, Hungary

Endre 23 Aug 2009, 11:35

I think that pcc is not a serious alternative for replacing gcc, but there are huge expectations in clang. You might want to take a look also at the llvm compiler infrastructure that's the engine under the cover. As I know C, and Objective-C are quite matured (Apple pushes the development hard) but there may still be problems with C++ (I simply don't know why this language is not forbidden yet Sad

). The source can of course be downloaded and compiled. I had absolutely no problem with the compilation. On the other hand I doubt that it is less than 1MiB.

23 Aug 2009, 11:35

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