Re: libstdc++/8610: std::streamoff type is 32-bit in GCC 3.2 whereas it was 64-bit in GCC 2.96

[Jason Elbaum]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8610
Regarding PR 8610: I've recently built gcc-3.2.1 in large file mode 
under Solaris 7. To do so, I made the following changes. Since I'm not 
familiar with the internals of libstdc++ or g++, I don't know whether 
this is the ideal way to implement this change, but it does work for 
this particular configuration.

In particular, I'm assuming this library code can be compiled *either* 
for standard file access *or* for large file I/O, but that the choice 
must be built-in at compile time of the compiler library. In other 
words, this becomes a large-file-I/O compiler installation which will 
not work correctly if large file I/O is not enabled (since basic_file.o 
will incorporate a particular setting for _FILE_OFFSET_BITS which may be 
different from the compile-time setting, causing incompatible types for 
streamoff). To fix this, I assume seekoff()/seekpos() must be inlined 
and implemented in the header file. I have not done this.

My changes:
1. In libstdc++-v3/config/io/c_io_stdio.h:
Old code:
  typedef long          streamoff;
New code:
  typedef off_t         streamoff;
2. In sparc-sun-solaris2.7/libstdc++-v3/src/basic_file.cc:
In __basic_file<char>::seekoff():
#if _FILE_OFFSET_BITS == 64
    fseeko(_M_cfile, __off, __way);
    return ftello(_M_cfile);
#else
    fseek(_M_cfile, __off, __way);
    return ftell(_M_cfile);
#endif
In __basic_file<char>::seekpos():
#if _FILE_OFFSET_BITS == 64
    fseeko(_M_cfile, __pos, ios_base::beg);
    return ftello(_M_cfile);
#else
    fseek(_M_cfile, __pos, ios_base::beg);
    return ftell(_M_cfile);
#endif

Regards,
Jason Elbaum
[EMAIL PROTECTED]