llvm dev - Mar 2011 - [LLVMdev] Question about TableGen when adding LLVM Backend.

Am 10.03.2011 um 05:35 schrieb Jakob Stoklund Olesen:
> On Mar 9, 2011, at 8:15 PM, Lu Mitnick wrote:
>
>> Hello Jakob,
>>
>> Is this means that TableGen execution is handled in Makefile.  
>> Porting programmer doesn't need to execute TableGen by hand?
>
> That's right.
>
> You are going to be editing your .td files a lot, so you want that  
> integrated in the build system.
In practice that'll mean adding the correct directives to  
CMakeLists.txt, not Makefile, right? That's what the targets I looked  
at did.
Or is that optional when you just invoke "make"?

Andreas

Hi Andreas,
> In practice that'll mean adding the correct directives to  
> CMakeLists.txt, not Makefile, right? That's what the targets I looked  
> at did.
LLVM can be built using either CMake or the GNU Autotools. Your backend
ought to provide support for both build systems, so you should create a
CMakeLists.txt as well as a Makefile in your sub-directory.
The Makefile appears to be rather trivial because there's some automagic
going on - nevertheless, you will need one. :-)
> Or is that optional when you just invoke "make"?
In that case you're using the Autotools, so your Makefile is going to be
utilized.

Best regards,
Christoph

Hi Christoph,

Am 13.03.2011 um 12:33 schrieb Christoph Erhardt:
>> In practice that'll mean adding the correct directives to
>> CMakeLists.txt, not Makefile, right? That's what the targets I
looked
>> at did.
> LLVM can be built using either CMake or the GNU Autotools. Your  
> backend
> ought to provide support for both build systems, so you should  
> create a
> CMakeLists.txt as well as a Makefile in your sub-directory.
> The Makefile appears to be rather trivial because there's some  
> automagic
> going on - nevertheless, you will need one. :-)
Now I see: My confusion came from seeing only the customized file  
names in BUILT_SOURCES. But Makefile.rules:1681 actually processes  
those files by *Gen*.inc.tmp name patterns.

Thanks for explaining,

Andreas
>> Or is that optional when you just invoke "make"?
> In that case you're using the Autotools, so your Makefile is going  
> to be
> utilized.
>
> Best regards,
> Christoph

On Mar 13, 2011, at 3:52 AM, Andreas Färber wrote:
> Am 10.03.2011 um 05:35 schrieb Jakob Stoklund Olesen:
>> On Mar 9, 2011, at 8:15 PM, Lu Mitnick wrote:
>>> Is this means that TableGen execution is handled in Makefile.
Porting programmer doesn't need to execute TableGen by hand?
>> You are going to be editing your .td files a lot, so you want that
integrated in the build system.
> 
> In practice that'll mean adding the correct directives to
CMakeLists.txt, not Makefile, right? That's what the targets I looked at
did.
> Or is that optional when you just invoke "make"?
Those are part of two unrelated build systems - cmake and autoconf.

You need to maintain both for an in-tree target. Otherwise you only need build
files for the build system you use.

/jakob