Hi,
I'm sending another email.... I'm enjoying this newsgroup...
Anyhow, I went back to my incremental link problem, which I enjoy.
I initialized everything to 0 or to {} if it's a structure or array.
Now it doesn't seem like the option -r works at all or requires some
modifications. Any function that is declared as extern is still said to be
an "undefined reference", although I believe I use the right command (see
previous email)
Even the symbols that are defined the libraries or in the .x require to link
them with them. Otherwise it is undefined. When I look at Grant's dummy
code, it seems that his extern foo function worked well....
Do I have to initialize the function to {} even if it's extern. I tried for
one function and it worked but for others that are used in more than one
file, it mentioned multiple definition. But I still don't know if it would
link probably with the application.
Any comments? I keep working on it.
Thanx a lot!
Yvan
From: Grant Edwards <[email protected]>
Reply-To: "GCC for MSP430 - http://mspgcc.sf.net";
<[email protected]>
To: [email protected]
Subject: Re: [Mspgcc-users] Incremental link update
Date: Thu, 15 Jun 2006 17:53:07 +0000 (UTC)
On 2006-06-15, Yvan Castilloux <[email protected]> wrote:
> I've made quite amount of research on how to do this.... people tellme
to
> invoke the ld command as the following:
>
> msp430-ld -r -o lib.o $(OBJECTS)
That looks right. I've done that for other targets, but I've
never tried it for MSP430.
> However my problem is that all global variables that are not
> initialized in the declaration statement cause the classic
> error "undefined reference".
Bummer. :)
> I just wonder if it would be an error specific to msp430-ld.
It sure looks like it is.
I compiled and incrementally linked the following two files:
---------file1.c---------------
extern int i;
int foo(void)
{
return i+1;
}
------------------------------
---------file2.c---------------
extern int foo(void);
int i;
int bar(void)
{
return i + foo();
}
------------------------------
It worked fine using gcc for IA32, ARM, H8, and AVR.
But it fails for MSP430:
$ msp430-ld -r -o foo.o file1.o file2.o
file1.o: In function foo':file1.c:(.text+0x6): undefined reference to i'
file2.o: In function bar':file2.c:(.text+0xa): undefined reference to i'
Like you said, it's only a problem for uninitialized variables.
If I add an initializer to the declaration of "i", then it's
OK.
> I sent an email to the binutils mailing list and I'm still
> waiting for an answer.
--
Grant Edwards grante Yow! I'll show you MY
at telex number if you
show
visi.com me YOURS...
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