[Bug c++/40099] New: 64bit constants

[Bug c++/40099] New: 64bit constants

[Andrey dot Martchovsky at gmail dot com]

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The following code produces

andrey@tiny:~/Documents/Thesis/TIA/pll$ gcc tst.c 
tst.c:2: warning: integer constant is too large for ‘long’ type
andrey@tiny:~/Documents/Thesis/TIA/pll$ g++ tst.c 
tst.c:2: error: integer constant is too large for ‘long’ type


1:#include <stdio.h>
2:long long int tst = 8000000000;
3:int main(){
4:      printf("sizeof(long long int)=%d\n",sizeof(long long int));
5:      printf("tst=%lld\n",tst);
6:      return 0;
7:}


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           Summary: 64bit constants
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Andrey dot Martchovsky at gmail dot com
GCC target triplet: g++ (Ubuntu 4.3.3-5ubuntu4) 4.3.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099

[Bug c++/40099] 64bit constants

[Andrey dot Martchovsky at gmail dot com]

------- Comment #1 from Andrey dot Martchovsky at gmail dot com  2009-05-11 02:07 -------
*** Bug 40098 has been marked as a duplicate of this bug. ***


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099

[Bug c++/40099] 64bit constants

[jakub at gcc dot gnu dot org]

------- Comment #2 from jakub at gcc dot gnu dot org  2009-05-11 06:08 -------
Why is that a problem? C and C++ are different languages.  Compiling with g++
means you are compiling the C code as C++ (see documentation).


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jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099

[Bug c++/40099] 64bit constants

[Andrey dot Martchovsky at gmail dot com]

------- Comment #3 from Andrey dot Martchovsky at gmail dot com  2009-05-11 18:22 -------
(In reply to comment #2)
> Why is that a problem? C and C++ are different languages.  Compiling with g++
> means you are compiling the C code as C++ (see documentation).
> 

My problem is that the error for 64bit ints in C++ shows up only under the x86
implementation of g++,
compiling the same code under x86_64 does not result in any errors.

Btw, the documentation for C++ suggests to use either int64_t or long long, for
64bit integers, and with either, I cannot define a constant that is greater
than 2^31-1. Therefore this is a bug, as the compiler DOES recognize the
declared variable to be 64 bit wide, and DOES all the 64bit arithmetic properly
(add,sub,mul,div,mod,shift ...), but DOES NOT recognize the variable to be
64bits in the initial parsing.


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Andrey dot Martchovsky at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099

[Bug c++/40099] 64bit constants

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2009-05-11 18:27 -------
For C++98 and C90, integer constants can only fit into the long type. You need
to use LL if you want a 64bit integer constant.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099

[Bug c++/40099] 64bit constants

[Andrey dot Martchovsky at gmail dot com]

------- Comment #5 from Andrey dot Martchovsky at gmail dot com  2009-05-11 19:04 -------
(In reply to comment #4)
> For C++98 and C90, integer constants can only fit into the long type. You need
> to use LL if you want a 64bit integer constant.
> 

Thank you for clarifying this.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40099