This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Should this compile and link??
- From: Bill Priest <priestwilliaml at yahoo dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Wed, 16 Jan 2002 14:27:29 -0600
- Subject: Should this compile and link??
c4e3.cc
---------------
#include "c4e3.h"
int main(void)
{
TEST_TYPE test1;
test1.f1();
}
----------------
c4e3_func.cc
----------------
#include <cstdio>
#include "c4e3.h"
void TEST_TYPE::f1(void)
{
puts("c4e3");
}
------------------
c4e3.h
------------------
#ifndef C4E3_H
#define C4E3_H
typedef struct // TEST_TYPE
{
void f1(void);
} TEST_TYPE;
#endif
--------------------
w/ stock g++ 3.0.3 the following commands
g++ -c -o c4e3.o c4e3.cc
g++ -c -o c4e3_func.o c4e3_func.cc
g++ c4e3.o c4e3_func.o -o c4e3
c4e3.o: In function `main':
c4e3.o(.text+0x11): undefined reference to `TEST_TYPE::f1()'
If I uncomment TEST_TYPE in c4e3 everything compiles and links
as it should.
If I change c4e3.cc to include "c4e3_func.cc" and change the command to
g++ -o c4e3 c4e3.cc
then it compiles and links even if the c4e3.h file is unchanged (ie TEST_TYPE is commented out).
This doesn't make a whole lot of sense to me; but I'm not a C++ expert or even novice.
Neither of my books (Thinking in C++ and C++ for C programmers) seems to cover this explicitly.
Is there something I'm missing here. Scoping or namespace resolution was the only thing I could
come up with but didn't see anything in either of the books.
Please set me straight,
Bill
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com