c++/3063: Explicit specification of a template-argument gives syntax error inside a template function.

[carlo at alinoe dot com]

>Number:         3063
>Category:       c++
>Synopsis:       Explicit specification of a template-argument gives syntax error inside a template function.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 06 06:46:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Vincent Penquerc'h
>Release:        All releases
>Organization:
>Environment:

>Description:
For some reason, g++ doesn't understand explicit
template parameter specification inside a template
function.

This error occurs with 2.95.1 and higher (didn't test
it with older versions).

~>g++ -v -c test.cc
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.0)
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c++ -D__GNUG__=2 -v -D__GNUC__=2 -D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem(posix) -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -D__tune_i386__ test.cc /tmp/ccPIZJO5.ii
GNU CPP version 2.96 20000731 (Red Hat Linux 7.0) (cpplib)
 (i386 Linux/ELF)
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/g++-3
 /usr/local/include
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1plus /tmp/ccPIZJO5.ii -quiet -dumpbase test.cc -version -o /tmp/ccgcwPq3.s
GNU C++ version 2.96 20000731 (Red Hat Linux 7.0) (i386-redhat-linux) compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.0).
test.cc: In function `void bar ()':
test.cc:15: parse error before `>'
~>g++-3.0 -v -c test.cc
Reading specs from /usr/local/gcc-3.0/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs
Configured with: /usr/src/gcc/gcc-cvs-3.0/configure --prefix=/usr/local/gcc-3.0 --enable-shared --with-gnu-as --with-gnu-ld --enable-languages=c++ --enable-debug
Thread model: single
gcc version 3.0 20010523 (prerelease)
 /usr/local/gcc-3.0/lib/gcc-lib/i686-pc-linux-gnu/3.0/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=0 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ test.cc -D__GNUG__=3 -D_GNU_SOURCE -D__GXX_DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase test.cc -version -o /tmp/ccMiEhFW.s
GNU CPP version 3.0 20010523 (prerelease) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.0 20010523 (prerelease) (i686-pc-linux-gnu)
        compiled by GNU C version 3.0 20010523 (prerelease).
ignoring nonexistent directory "/usr/local/gcc-3.0/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/gcc-3.0/include/g++-v3
 /usr/local/gcc-3.0/include/g++-v3/i686-pc-linux-gnu
 /usr/local/gcc-3.0/include/g++-v3/backward
 /usr/local/include
 /usr/local/gcc-3.0/lib/gcc-lib/i686-pc-linux-gnu/3.0/include
 /usr/include
End of search list.
test.cc: In function `void bar()':
test.cc:15: parse error before `>' token


>How-To-Repeat:
Compile the file 'test.cc' given below as g++ -c test.cc

struct A {
  template<typename T> void func(void) { new T; }
};
 
void foo(void)
{
  A a;
  a.func<char>();               // Not an error
}
 
template<typename T>
void bar(void)
{
  A a;
  a.func<char>();               // Syntax Error (line 15)
}
>Fix:

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