Re: Need help: alternative module inclusion - duplicate symbols

[Michael Lawnick]

Using function pointers solves the duplicate symbol problem.
But still there is a way needed to get the information passed into build.
FPGA is so essential in my use case that the configuration must be
compiled-in. But as the sources are under git a #define is not a good
option.

Am 26.02.2024 um 14:38 schrieb Vladimir 'phcoder' Serbinenko:
> You can add a dispatcher which switches between 2 modules. E.g.
> real_do_stuff (...);
> fake_do_stuff(...);
>
> static int (*do_stuff)( ...);
> And switch pointer between 2 implementations. See terminal output and
> grub_xputs for examples
>
> On Mon, Feb 26, 2024 at 1:51 PM Michael Lawnick via Grub-devel
> <grub-devel@gnu.org> wrote:
>>
>> Hi group,
>>
>> hope you can help me:
>> I have modules pci_fpga.c and pci_fpga_emul.c with same functions in
>> them but different implementation, one for the real device, the other
>> one is just emulating.
>>
>> What I now want is being able to include one of both versions through
>> build command. I started with this:
>>
>> Makefile.core.def:
>> ...
>> module = {
>>   name = pci_fpga;
>>   common = startlib/board/pci_fpga.c;
>>   enable = efi;
>> };
>>
>> module = {
>>   name = pci_fpga_emul;
>>   common = startlib/board/pci_fpga_emul.c;
>>   enable = efi;
>> };
>> ...
>>
>> but then I get duplicate symbols error even without giving pci_fpga or
>> pci_fpga_emul on the build.
>>
>> For using different packages than 'common' like this
>> module = {
>>   name = pci_fpga;
>>   pci_fpga = startlib/board/pci_fpga.c;
>>   enable = efi;
>> };
>> I could not find means to get pci_fpga included.
>>
>> Same problem if trying to approach it via different enable flag: How to do?
>>
>> Can anybody help? In docs I couldn't find usable hints.
>>
>> --
>> KR
>> Michael
>>
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>
>
>