[Bug c++/29905] New: double const not const anymore.

[Bug c++/29905] New: double const not const anymore.

[carlo at gcc dot gnu dot org]

This used to work fine with version 3.x

double const d = 4.3;
int const c = (int)d;
int a[c];

>g++-svn-4.3 -v -c troep2.cc
Using built-in specs.
Target: i686-cw-linux-gnu
Configured with: /usr/src/gcc/gcc-svn-4.2/configure
--prefix=/usr/local/gcc-svn-4.2 --enable-shared --with-gnu-as --with-gnu-ld
--enable-languages=c++ --enable-debug --enable-threads=posix --disable-checking
--with-system-zlib --enable-__cxa_atexit --host=i686-cw-linux-gnu
Thread model: posix
gcc version 4.3.0 20061108 (experimental)
 /usr/local/gcc-svn-4.3/bin/../libexec/gcc/i686-cw-linux-gnu/4.3.0/cc1plus
-quiet -v -iprefix
/usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/ -D_GNU_SOURCE
troep2.cc -quiet -dumpbase troep2.cc -mtune=generic -auxbase troep2 -version -o
/tmp/ccrbQmdj.s
ignoring nonexistent directory
"/usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/../../../../i686-cw-linux-gnu/include"
ignoring nonexistent directory
"/usr/local/gcc-svn-4.2/lib/gcc/i686-cw-linux-gnu/../../../include/c++/4.3.0"
ignoring nonexistent directory
"/usr/local/gcc-svn-4.2/lib/gcc/i686-cw-linux-gnu/../../../include/c++/4.3.0/i686-cw-linux-gnu"
ignoring nonexistent directory
"/usr/local/gcc-svn-4.2/lib/gcc/i686-cw-linux-gnu/../../../include/c++/4.3.0/backward"
ignoring nonexistent directory
"/usr/local/gcc-svn-4.2/lib/gcc/i686-cw-linux-gnu/4.3.0/include"
ignoring nonexistent directory
"/usr/local/gcc-svn-4.2/lib/gcc/i686-cw-linux-gnu/../../../i686-cw-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:

/usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/../../../../include/c++/4.3.0

/usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/../../../../include/c++/4.3.0/i686-cw-linux-gnu

/usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/../../../../include/c++/4.3.0/backward
 /usr/local/gcc-svn-4.3/bin/../lib/gcc/i686-cw-linux-gnu/4.3.0/include
 /usr/local/include
 /usr/local/gcc-svn-4.2/include
 /usr/include
End of search list.
GNU C++ version 4.3.0 20061108 (experimental) (i686-cw-linux-gnu)
        compiled by GNU C version 4.3.0 20061108 (experimental).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129595
Compiler executable checksum: 5a6b66f3bef6583a263c989adde4d3fa
troep2.cc:3: error: array bound is not an integer constant


Every 4.x version gives the same error.

I really don't like this, because I have code that depends
heavily on computations with double during *compile time*.
If the above means that all those calculations are postponed
to runtime :/  Why?

I really hope this is a bug.


-- 
           Summary: double const not const anymore.
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: carlo at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29905

[Bug c++/29905] double const not const anymore.

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-11-20 07:05 -------
The C++ standard says this is not an intergal constant.


-- 

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=29905