Re: extern variable

[sumanth <sumanth.gundapneni@redpinesignals.com>]

Hi jim ,
    forgot to mention , I am accessing variable a as extern in file2.c
    I am going through the solutions pointed by you but not able to 
figure out one .


Thanks ,
Sumanth G

Jim Wilson wrote:
> On Tue, 2009-08-04 at 00:06 +0530, sumanth wrote:
>   
>>  > mycompiler-gcc -g file1.c file2.c
>>  > mycompiler-gdb a.out
>>   >> when i print "a" in file1.c , i am able to see value 10;
>>   >> when i print "a" int file2.c, it prints , no symbol defined. 
>> Instead I can access it with " print _a"
>>     
>
> This sounds odd, as there is no variable a or _a in file2.c, and if you
> can see a variable in one file you should be able to see if with the
> same name in another file.
>
> Anyways, I think I already answered this with my first message when I
> pointed you at ASM_OUTPUT_* and ASM_GENERATE_INTERNAL_LABEL etc.  If you
> compile with -g -S, and look at the assembly language, you will see that
> "_a" is being used in the debug info someplace for the variable name
> where "a" should be used instead.  "_a" is correct for the variable
> address, but not the variable name.  So you will have to step through
> your gcc port to figure out why the "_a" is incorrectly printed, and
> most likely it is a bug in one of the macros I have mentioned.  Take a
> look at a port that handles this correctly to see what they do
> differently to make this work.
>
> Jim
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