[LLVMdev] Some Questions about LLVM

[Reid Spencer]

A recent patch to the makefile system (you'll need to work from the latest CVS
files) allows LLVM to be correctly installed (and uninstalled) to the directory
named by the --prefix=<dir> argument of the configure script (/usr/local by
default).

The error message you're setting is occurring because gccld can't find the
"libc.gc and libcrtend.a" bytecode libraries. Those libraries are installed by
"make -C runtime install" which uses the value you passed to the (note the
name!) --with-llvmgccdir argument to configure. The same value should be given
to your LLVM_LIB_SEARCH_PATH. I'm not sure if its a typo or not, but if the
configure options you gave below are pasted from the actual usage then you have
a command line error there. The "--llvmgccdir=..." should be
"--with-llvmgccdir=...". Probably if you correct that, you'll end up with
bytecode libraries installed in the right place.

Reid.

zhou feng wrote:

> Yes, I checked that envvar, and it is set.
> The error msg when compiling a .c file is:
> gccld: WARNING: Cannot find library -lc
> gccld: WARNING: Cannot find library -lcrtend
> Can LLVM be installed using a prefix?
> --zhoufeng
> 
> Chris Lattner wrote:
> 
>>On Mon, 25 Oct 2004, zhou feng wrote:
>>  
>>
>>>I have some questions about LLVM
>>>1. I recently compiled LLVM on my X86 machine correctly. But when I use
>>>the built LLVm compiling programs(in the getting started guide), I got
>>>an warning saying can not find library "lc" (something like that). Yet
>>>LLVM did yeild a execution native code and it runs correctly except with
>>>a waring saying something like "__main**"(I cann't remember very clearly).
>>>I followed all the install instructions except the installation dir for
>>>llvm is /home/my/llvm/llvm-bin/ and llvmgcc dir is
>>>/home/my/llvm/llvm/llvm-gcc and the configure option is
>>>--prefix=/home/my/llvm/llvm-bin/ --enable-jit
>>>--llvmgccdir=/home/my/llvm/llvm/llvm-gcc
>>>    
>>>
>>
>>Make sure you set your LLVM_LIB_SEARCH_PATH envvar, as specified in the
>>getting started guide:
>>http://llvm.cs.uiuc.edu/docs/GettingStarted.html#environment
>>
>>  
>>
>>>btw: there was an error when installing LLVM, the system complained "no
>>>pax command...". What pax is?
>>>    
>>>
>>
>>I have no idea.
>>
>>  
>>
>>>2. I want to do some work on register allocation using LLVM, which parts
>>>of code should I read? ( The whole source is too big for me)
>>>    
>>>
>>
>>As Alkis mentioned, the code in lib/CodeGen/* is the most relevant.
>>
>>-Chris
>>
>>  
>>
> 
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