[LLVMdev] Compiling glibc on Linux
Babak Salamat
bsalamat at uci.edu
Wed May 9 15:05:06 PDT 2007
Reid and Bill,
Thank you very much for your helpful comments.
Your comments helped me find out what part of my work was wrong that
my changes were not effective in llvm-gcc.
Thank you again,
Babak
On May 9, 2007, at 1:57 PM, Reid Spencer wrote:
> On Wed, 2007-05-09 at 13:38 -0700, Babak Salamat wrote:
>> I am convinced to use llvm-gcc. As I mentioned in my previous email,
>> I have changed native code generation in llc to generate code with a
>> different stack organization. In order to have working binaries, the
>> libraries must be compiled with the new tool and have the same stack
>> organization. Now that I cannot use llc, it seems that I have to
>> modify llvm-gcc to have it generate code with the stack organization
>> that I want.
>
> I think you're missing the point. llvm-gcc and llc link with *exactly*
> the same set of libraries for code generation. If you've modified llc
> then llvm-gcc (after rebuild) will produce the same results.
>
> If you've built your own target then you need to ensure that llvm-gcc
> links that target in by modifying the llvm-gcc/gcc/Makefile.in file.
>
>>
>> For X86 target I have particularly changed
>> X86RegisterInfo::eliminateFrameIndex, X86RegisterInfo::emitPrologue
>> and X86RegisterInfo::emitEpilogue in the llc source code.
>
> To be clear, llc does not contain any of those functions. They are
> part
> of the X86 target in lib/Target/X86. This is the same X86 target
> that is
> linked into llvm-gcc when you build it. There should be zero
> difference
> between your llvm-gcc output and your llc output.
>
>>
>> Can I find equivalent functions in the llvm-gcc source, so that I can
>> implement the needed stack organization?
>
> Yes you can .. its the same source!
>
>>
>> Thank you,
>> Babak
>
> Hope this clears it up.
>
> Reid.
>
>>
>>
>> On May 9, 2007, at 12:47 PM, Reid Spencer wrote:
>>
>>> Babak,
>>>
>>> I strongly suggest you drop trying to use llvmc. Instead, probably
>>> just
>>> compiling your library with llvm-gcc should be sufficient. The llvm-
>>> gcc
>>> tool has much of llc's functionality built in to it so you're
>>> going to
>>> get the same output. If that doesn't work for you, then please
>>> describe
>>> what you're trying to do in more detail and we'll tell you how it
>>> can be
>>> done. Coming at it from the "llvmc doesn't work" angle, doesn't
>>> help us
>>> solve your actual problem (because we don't know what it is).
>>>
>>> Thanks,
>>>
>>> Reid.
>>>
>>> On Wed, 2007-05-09 at 00:08 -0700, Babak Salamat wrote:
>>>> Thank you Chris.
>>>>
>>>> Actually, I have changed the stack organization in the "llc" source
>>>> codes for x86 target. Thus, I need libraries compiled with the new
>>>> stack organization. If I use llvm-gcc (and apparently also llvmc),
>>>> llc will not be invoked. I was hoping that llvmc would call llvm-
>>>> gcc
>>>> to compile to bc file and then call llc to compile to native
>>>> assembly, but apparently this doesn't happen.
>>>> Do you know of any possible ways to involve llc in compilation of
>>>> libraries?
>>>>
>>>> --Babak
>>>>
>>>> On May 8, 2007, at 11:33 PM, Chris Lattner wrote:
>>>>
>>>>> On Tue, 8 May 2007, Babak Salamat wrote:
>>>>>> Yes, I have built and installed llvm-gcc and "llvm-gcc --print-
>>>>>> prog-
>>>>>> name=cc1" return the correct path for cc1, so I assume its
>>>>>> path is
>>>>>> set correctly in the config files, but I haven't installed config
>>>>>> files separately. Do I need to do that? Is there any
>>>>>> documentation
>>>>>> about it?
>>>>>
>>>>> I'd strongly suggest just building with CC=llvm-gcc CXX=llvm-g++.
>>>>>
>>>>> llvmc is extremely experimental and has not seen wide use.
>>>>>
>>>>> -Chris
>>>>>
>>>>>> On May 8, 2007, at 7:33 PM, Reid Spencer wrote:
>>>>>>
>>>>>>> Babak,
>>>>>>>
>>>>>>> As its manual page (http://llvm.org/docs/CommandGuide/html/
>>>>>>> llvmc.html)
>>>>>>> states, llvmc is an experimental tool:
>>>>>>>
>>>>>>> llvmc is considered an experimental LLVM tool because it has
>>>>>>> these
>>>>>>> deficiencies:
>>>>>>>
>>>>>>> Poor configuration support
>>>>>>> The support for configuring new languages, etc. is weak.
>>>>>>> There
>>>>>>> are many command line configurations that cannot be
>>>>>>> achieved
>>>>>>> with the current support. Furthermore the grammar is
>>>>>>> cumbersome
>>>>>>> for configuration files. Please see http://llvm.org/
>>>>>>> PR686
>>>>>>> for
>>>>>>> further details.
>>>>>>>
>>>>>>> That said, you should be able to get it to work with llvm-gcc.
>>>>>>>
>>>>>>> Did you build llvm-gcc? Did you check the paths in the "c"
>>>>>>> config
>>>>>>> file?
>>>>>>> Did you install the config files?
>>>>>>>
>>>>>>> All of these things need to be done in order for the standard
>>>>>>> config
>>>>>>> file to work.
>>>>>>>
>>>>>>> Reid.
>>>>>>>
>>>>>>> On Tue, 2007-05-08 at 18:40 -0700, Babak Salamat wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I am trying to compile glibc on Linux using llvm. I need to do
>>>>>>>> this
>>>>>>>> for a research project.
>>>>>>>> The problem is that llvmc doesn't work, and I guess I have
>>>>>>>> to set
>>>>>>>> CC=llvmc to get the glic compiled. For some reason llvmc
>>>>>>>> complains
>>>>>>>> that it cannot find %llvmcc1%. I have this problem both on my
>>>>>>>> Mac and
>>>>>>>> my Linux system. Other tools that I have tested including llvm-
>>>>>>>> gcc
>>>>>>>> work without any problem.
>>>>>>>> First, I appreciate it if you let me know what can cause this
>>>>>>>> problem
>>>>>>>> and second, tell me if you think I have any chance to compile
>>>>>>>> glibc
>>>>>>>> using LLVM.
>>>>>>>>
>>>>>>>> Thank you,
>>>>>>>> Babak
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------
>>>>>>>> Babak Salamat
>>>>>>>> PhD Student
>>>>>>>> Department of Computer Science
>>>>>>>> School of Information and Computer Sciences
>>>>>>>> University of California, Irvine
>>>>>>>> email: bsalamat at uci.edu
>>>>>>>> web: www.ics.uci.edu/~bsalamat
>>>>>>>> ---------------------------------------------------------------
>>>>>>>>
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>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>>> -Chris
>>>>>
>>>>> --
>>>>> http://nondot.org/sabre/
>>>>> http://llvm.org/
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