Re: ltdl, -ansi compiler flag and windows host

[Roumen Petrov]

Ralf Wildenhues wrote:
> Hello Roumen,
>
> * Roumen Petrov wrote on Sun, Nov 15, 2009 at 01:39:03PM CET:
> > The modification of lt_private .h is result of this discussion
> > http://www.mail-archive.com/address@hidden/msg02530.html
>
> Actually, I don't know why I added that "|| __STRICT_ANSI__" there at
> all.  I'm hesitant to change it without knowing though.
>
> You should be able to work around this issue with adding something like
> this to your CPPFLAGS (untested):
>   '-D__attribute__(X)=__attribute__(X)'
>
> Cheers,
> Ralf

Test case:
========================================
#include <windows.h>

#ifndef __attribute__
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || 
__STRICT_ANSI__
#  define __attribute__(x)
# endif
#endif

#ifndef LT__UNUSED
#  define LT__UNUSED __attribute__ ((__unused__))
#endif

extern int __declspec(dllimport) lt_foo LT__UNUSED;

static int foo() {
  LoadLibrary("foo");
  return(0);
}
========================================

Results:
1)
--------------
$ ....-mingw...-gcc -Wall -c test-ansi.c -E 
'-D__attribute__(X)=__attribute__(X)' | tail -6
extern int __attribute__((dllimport)) lt_foo __attribute__ ((__unused__));

static int foo() {
  LoadLibraryA("foo");
  return(0);
}
--------------

2)
--------------
$ ....-mingw...-gcc -Wall -c test-ansi.c -E 
'-D__attribute__(X)=__attribute__(X)' -ansi | tail -6
extern int lt_foo ;

static int foo() {
  LoadLibraryA("foo");
  return(0);
}
--------------
In case 2) with lowercase X result is same variable lost dllimport 
attribute.



What about to modify lt__private.h to ?
=========================
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
#  define __attribute__(x)
#endif

#ifndef LT__UNUSED
# ifndef __STRICT_ANSI__
#  define LT__UNUSED __attribute__ ((__unused__))
# else
#  define LT__UNUSED
# endif
#endif
=========================

I can't test as the oldest my compiler is gcc 2.95.3 where attribute is 
 supported.

Roumen