[LLVMdev] question about gccld and external libraries

[John Criswell]

Jakob Praher wrote:
> hi,
> 
> I'm really new to llvm. I've successfully bootstrapped llvm-14 on my 
> system and am able to successfully compile c code to llvm.
> 
> the problem is now that gccld is complaining that it can't find the 
> libraries, like "c" or "crtend". [1]

If you built your own llvm-gcc, then you need to build and install the 
bytecode libraries as Misha directed.

However, if you downloaded a pre-built llvm-gcc frontend, then the 
bytecode libraries should already be pre-built for you.  If that is the 
case, then chances are good that you need to set LLVM_LIB_SEARCH_PATH so 
that gccld can find the libraries.

You can try setting the environment variable LLVM_LIB_SEARCH_PATH to 
<cfrontend>/bytecode-libs, where <cfrontend> is the general installation 
directory of llvm-gcc.

For example, if I downloaded the binary llvm-gcc frontend for Linux and 
installed it in /home/john/cfrontend, then I would set 
LLVM_LIB_SEARCH_PATH to /home/john/cfrontend/x86/llvm-gcc/bytecode-libs.

This step will not be required in future versions of LLVM, which is 
probably why you missed it.  The docs on the web page are the current 
ones geared for the next release.  If you go to 
http://llvm.cs.uiuc.edu/releases/1.4/docs/index.html, you will see the 
documentation pertaining to LLVM 1.4.

> 
> all is fine, if I just use intrinsified functions like printf and 
> friends, but I want to use the clock_gettime function and now the lli 
> dumps.
> 
> thanks for any pointers.
> 
> 
> -- jakob
> 
> [1]
> gccld -o test-llvm 
> -L/mnt/fire300/jp/llvm-14/lib/gcc/i686-pc-linux-gnu/3.4-llvm 
> -L/mnt/fire300/jp/llvm-14/lib/gcc/i686-pc-linux-gnu/3.4-llvm/../../.. 
> /tmp/ccc7ax7O.o -lc -lcrtend
> 
> gccld: warning: Cannot find library 'c'
> gccld: warning: Cannot find library 'crtend'
> gccld: warning: Cannot find library 'c'
> gccld: warning: Cannot find library 'crtend'
> 
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Regards,

-- John T.

-- 
John T. Criswell
Research Programmer
University of Illinois at Urbana-Champaign
"It's today!" said Piglet. "My favorite day," said Pooh.