Dear Blazej,
My question is why when I do "gcc test.program.c"
without -lgcc, I get the error message? Isn't linker supposed to link
the program with libgcc automatically?
Best
Navid
----- Original Message ----
From: Blazej <riona@xxxxxxxxx>
To: gcc-help@xxxxxxxxxxx
Sent: Thursday, January 22, 2009 4:01:02 PM
Subject: RE: modifying libgcc.a
>Ok, I guess I have some updates on the problem below:
>When I do "gcc test.program.c -lgcc", it works. Does that mean linker does
>not link the output of gcc with libgcc? Should I seek for the problem in
>gcc or in my linker? (perior to changing libgcc, I never needed to use
>libgcc).
>Thank you
>David
Everything is ok. The linker automatically adds the lib suffix. So when you
execute -lgcc it means either -llibgcc.a or -llibgcc.so. This depends on
what link option you choose (-static, -shared).
Regards,
Blazej
----- Original Message ----
From: Navid Toosizadeh <navid_toosizadeh@xxxxxxxxx>
To: gcc-help@xxxxxxxxxxx
Sent: Thursday, January 22, 2009 1:08:06 PM
Subject: modifying libgcc.a
Greetings,
For some reason, I like to modify libgcc.a after GCC is built. I intend to
add new definitions for macros such as mulsi3 existing in libgcc.a. Here's
what I did:
I compiled the new definition of mulsi3, made the object and then converted
it to libgcc.a using "ar".
Now, to test this, I wrote a small program that multiplies two numbers. When
I do "gcc test_program.c libgcc.a" it compiles and the output is correct.
But when I do : "gcc test_program.c", it throws an error complaining about
undefined reference to __mulsi3, although I did put the libgcc.a in the path
(and the linker doesn't complain there's no libgcc when I tried -lgcc).
Could you help e understand why the definition of __mulsi3 is not used from
libgcc.a when I test "gcc test_program.c"?
Best regards
Navid
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