[Bug target/20366] AIX g++ -D_LARGE_FILES fails to compile #include <iostream>

[haubi at gentoo dot org]

------- Comment #4 from haubi at gentoo dot org  2007-12-01 22:04 -------
Same here with gcc-4.2.2 and powerpc-ibm-aix5.3.0.0.

Some diagnostics what happens when _LARGE_FILES (and _LARGE_FILE_API) is
defined:

<sys/types.h>

/* would both be 'long' without _LARGE_FILES: */
typedef long long fpos_t;
typedef long long off_t;

/* because of _LARGE_FILE_API: */
typedef long long   off64_t;

<stdio.h>

/* because of _LARGE_FILES (the 'problematic' ones): */
#define fseeko fseeko64
#define ftello ftello64
#define fgetpos fgetpos64
#define fsetpos fsetpos64
#define fopen fopen64
#define freopen freopen64

/* these actually are declared as f*64() because of defines above: */
extern FILE *fopen(const char *, const char *);
extern FILE *freopen(const char *, const char *, FILE *);
extern int   fgetpos(FILE *, fpos_t *);
extern int   fsetpos(FILE *, const fpos_t *);
extern int   fseeko(FILE *, off_t, int);
extern off_t ftello(FILE *);

/* because of _LARGE_FILE_API: */
extern int fgetpos64(FILE *, fpos64_t *);
extern FILE *fopen64(const char *, const char *);
extern FILE *freopen64(const char *, const char *, FILE *);
extern int fseeko64(FILE *, off64_t, int);
extern int fsetpos64(FILE *, const fpos64_t *);
extern off64_t ftello64(FILE *);

<cstdio>

/* remember: these actually are declared as f*64(),
 * while the original ones are undeclared.
 */
#undef fgetpos
#undef fopen
#undef freopen
#undef fsetpos

namespace std {
  using ::fpos_t;
  using ::fgetpos;
  using ::fopen;
  using ::freopen;
  using ::fsetpos;
}


I'm unsure how to 'fix' that 'correctly' - one suggestion is to 'fixincludes':

Add this just _before_ those '#define fopen fopen64' lines in <stdio.h>

  static FILE *fopen(const char *a, const char *b) { return fopen64(a,b); }

Eventually there is a better way to redirect from 'fopen' to 'fopen64' on aix
also for the compiler - not just the preprocessor.


-- 

haubi at gentoo dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |haubi at gentoo dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20366