Compiler won't let me declare ::main() a friend from inside template class.
It's not a problem in practice (who would want to do such thing?), however I
don't see a reason for such a behavior. If I change the name to something else,
it works correctly. gcc 3.3.2 and gcc 2.95.3 are also behaving this way.
Preprocessed main.cc:
# 1 "main.cc"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "main.cc"
template< class X >
class Foo
{
private:
int i;
friend int main();
};
int main()
{
int i = Foo<int>().i;
}
Command line:
gcc-4.0 -v -save-temps -Wall main.cc
Compiler output:
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.2/configure --prefix=/opt/gcc-4.0/
--program-suffix=-4.0 --enable-threads
Thread model: posix
gcc version 4.0.2
/opt/gcc-4.0/bin/../libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1plus -E -quiet -v
-iprefix /opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/ -D_GNU_SOURCE
main.cc -mtune=pentiumpro -Wall -fpch-preprocess -o main.ii
ignoring nonexistent directory
"/opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../i686-pc-linux-gnu/include"
ignoring duplicate directory
"/opt/gcc-4.0//lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2"
ignoring duplicate directory
"/opt/gcc-4.0//lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2/i686-pc-linux-gnu"
ignoring duplicate directory
"/opt/gcc-4.0//lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2/backward"
ignoring duplicate directory
"/opt/gcc-4.0//lib/gcc/i686-pc-linux-gnu/4.0.2/include"
ignoring nonexistent directory
"/opt/gcc-4.0//lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2
/opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2/i686-pc-linux-gnu
/opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/../../../../include/c++/4.0.2/backward
/opt/gcc-4.0/bin/../lib/gcc/i686-pc-linux-gnu/4.0.2/include
/usr/local/include
/opt/gcc-4.0//include
/usr/include
End of search list.
/opt/gcc-4.0/bin/../libexec/gcc/i686-pc-linux-gnu/4.0.2/cc1plus -fpreprocessed
main.ii -quiet -dumpbase main.cc -mtune=pentiumpro -auxbase main -Wall -version
-o main.s
GNU C++ version 4.0.2 (i686-pc-linux-gnu)
compiled by GNU C version 4.0.2.
GGC heuristics: --param ggc-min-expand=81 --param ggc-min-heapsize=96807
main.cc:6: error: cannot declare '::main' to be a template
main.cc: In function 'int main()':
main.cc:11: warning: unused variable 'i'
--
Summary: Unable to declare friend main() from class template
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: minor
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: machata at post dot cz
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24449
