Date: Mon, 30 Sep 2002 01:33:26 -0400 From: "Lyndon Griffin" <lyndon@bsd4us.org> To: freebsd-questions@freebsd.org Subject: C++ symbol mangling Message-ID: <20020930053326.18827.qmail@bsd4us.org>
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I'm involved in a porting project. I say that first because changing the
code that I will list below is less of an option than it may seem. It's
part of an API that third-party developers code to, my work on porting comes
in secondary to changing the API. The code compiles as is, not even a
warning, on win32 and linux.
The environment is 4.6-STABLE, maybe a few weeks outta date, using the
default GCC toolchain (2.95.3).
Here's the code (well, a relevant representation, anyways). The example
below is sufficient to reproduce the problem, at least.
------MyString.h------
class MyString
{
public:
MyString(){};
~MyString(){};
void toupper( void );
void tolower( void );
static char * toupper( char * );
static char * tolower( char * );
};
------MyString.cpp-----
#include "MyString.h"
#include <ctype.h>
char * MyString::toupper( char *s )
{
char *t = s;
while ( *t )
{
*t = ::toupper( *t );
t++;
}
return ( s );
}
char * MyString::tolower( char *s )
{
char *t = s;
while ( *t )
{
*t = ::tolower( *t );
t++;
}
return ( s );
}
Seems harmless enough, when looking at it... The trouble is that the
preprocessor is changing the name of MyString::toupper() to
MyString::__toupper (same for tolower), which is, of course, not declared in
the class. This feels like the result of the compiler getting confused
between the definition of toupper in ctype.h *and* in this program's source.
The questions:
1) Are the ctype.h definitions getting in the way?
2) Is there a compiler flag to prevent this behavior? If so, what is it?
3) Barring the compiler flag, could someone architect for me a macro or two
that would prevent this problem?
Thanks mucho,
<:) Lyndon
http://bsd4us.org/
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