AIX and tolower()

AIX and tolower()

[GCS]

Hi!

 I have gcc 3.0.1 on AIX 5.1. When I compile a program, the linking phase
gives:
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
ld: 0711-317 ERROR: Undefined symbol: ._Z7toloweri
Previously I had to copy libgcc.a from /usr/local/lib to /lib, otherwise it
was not found. Where is the code for tolower()?
Ofcourse -lgcc is used.

Thanks in advance,
GCS

Re: AIX and tolower()

[David Edelsohn]

>>>>> GCS writes:

GCS> Where is the code for tolower()?

	libstdc++ defines tolower methods for some classes of objects and
AIX libc defines tolower().  Is tolower() declared correctly in the
appropriate scope?

David

Re: AIX and tolower()

[David Edelsohn]

>>>>> GCS  writes:

GCS> I think it is correct. Details are coming:
GCS> the file begins with #include <ctype.h> which holds the definition for tolower
GCS> as 'extern int tolower(int)'. Later, the source has a
GCS> #if defined AIX
GCS> #define abc() tolower()
GCS> #endif
GCS> etc.
GCS> Then it is used in a loop:
GCS> for(i=0;i<strlen(string);i++)
GCS> string[i]=abc(string[i]);

GCS> Do you see any bad thing in the above usage?

	Your example does not appear to use any C++ objects.  If "string"
is a C-like string and you want to invoke a function in the C library, you
need to declare the function extern "C"

extern "C" int tolower(int);

	If you write the program with the appropriate C++ objects which
can access ctype, then tolower is already provided as a method on that
object. 

GCS> Btw, the linker gets libstdc++ to link with. I could not force libc, as -lc and
GCS> -l/lib/libc.a gave me an error.

	GCC always links with the system libc automatically, unless you
tell it not to.  g++ always links with libstdc++ automatically.

	The compiler is mangling the invocation of tolower in your
original example because you told it tolower was a C++ function.  This is
not a G++ or libstdc++ problem, it is a C++ programming question.  When
you tell the compiler the correct information, the program will link
correctly. 

David

Re: AIX and tolower()

[GCS]

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Hi David,

> GCS> Where is the code for tolower()?
> 	libstdc++ defines tolower methods for some classes of objects and
> AIX libc defines tolower().  Is tolower() declared correctly in the
> appropriate scope?
 I think it is correct. Details are coming:
the file begins with #include <ctype.h> which holds the definition for tolower
as 'extern int tolower(int)'. Later, the source has a 
#if defined AIX
#define abc() tolower()
#endif
etc.
Then it is used in a loop:
for(i=0;i<strlen(string);i++)
     string[i]=abc(string[i]);

Do you see any bad thing in the above usage?
Btw, the linker gets libstdc++ to link with. I could not force libc, as -lc and
-l/lib/libc.a gave me an error.
The latter said -l /lib/libc.a (notice the space separator even if I do not put
any between the two in the command line) could not be found. All I can
think of that ld does not follow symlinks; at least /lib/libc.a is a symlink
on my system, and I had a previous lib problem which was solved when
I have copied the lib from /usr/local/lib to /lib.
Would it be a solution if I do something like
#define tolower(c)          ((c)-('A'-'a')) ?
My AIX is 5.1, and gcc is 3.0.1.

Thanks in advance if you have any idea for this problem,
GCS