c++/4629: non-constant `sizeof (void*)' cannot be used as template argument

[Peter Schmid]

>Number:         4629
>Category:       c++
>Synopsis:       non-constant `sizeof (void*)' cannot be used as template argument
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 20 07:26:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Peter Schmid
>Release:        3.1 20011013 (experimental)
>Organization:
TU Darmstadt
>Environment:
System: Linux kiste 2.4.12 #2 Sat Oct 20 15:07:23 CEST 2001 i686 unknown
Architecture: i686
SuSE 7.1
glibc 2.2
GNU ld version 2.11.90.0.23
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --enable-shared --enable-threads=posix --enable-languages=c,c++,f77,objc --disable-nls --enable-clocale=gnu
>Description:
gcc 3.1 rejects the following code tp.C extracted from
libs/pool/test/test_pool_alloc.cpp from the current boost
repository. gcc 3.01 and gcc 2.95.2 accept this code.

>How-To-Repeat:

Source code tp.C
template <unsigned I> struct A {};

template <typename SizeType>
struct B
{
    char * f() const
    {
      return (A<sizeof(void *)>::value);
    }
};

Compiling tp.C by gcc 3.1
g++ -v -c -W -Wall tp.C 
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --enable-threads=posix --enable-languages=c,c++,f77,objc --disable-nls --enable-clocale=gnu
Thread model: posix
gcc version 3.1 20011013 (experimental)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -W -Wall -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ tp.C -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase tp.C -W -Wall -version -o /tmp/ccEyvLMb.s
GNU CPP version 3.1 20011013 (experimental) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.1 20011013 (experimental) (i686-pc-linux-gnu)
	compiled by GNU C version 3.1 20011013 (experimental).
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/i686-pc-linux-gnu
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/include
 /usr/include
End of search list.
tp.C: In member function `char* B<SizeType>::f() const':
tp.C:8: non-constant `sizeof (void*)' cannot be used as template argument

Compiling tp.C by gcc 2.95.2
/usr/bin/g++ -v -c -W -Wall tp.C 
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.2/specs
gcc version 2.95.2 19991024 (release)
 /usr/lib/gcc-lib/i486-suse-linux/2.95.2/cpp -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__EXCEPTIONS -W -Wall -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di486 -D__i486 -D__i486__ tp.C /tmp/ccwTynxn.ii
GNU CPP version 2.95.2 19991024 (release) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/g++
 /usr/local/include
 /usr/lib/gcc-lib/i486-suse-linux/2.95.2/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i486-suse-linux/2.95.2/../../../../i486-suse-linux/include
End of omitted list.
 /usr/lib/gcc-lib/i486-suse-linux/2.95.2/cc1plus /tmp/ccwTynxn.ii -quiet -dumpbase tp.cc -W -Wall -version -o /tmp/ccWkj1hG.s
GNU C++ version 2.95.2 19991024 (release) (i486-suse-linux) compiled by GNU C version 2.95.2 19991024 (release).
 /usr/i486-suse-linux/bin/as -V -Qy -o tp.o /tmp/ccWkj1hG.s
GNU assembler version 2.10.91 (i486-suse-linux) using BFD version 2.10.0.33

>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: