llvm dev - Mar 2005 - [LLVMdev] question about gccld and external libraries

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]

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'

Hey, Jakob --

On Tue, Mar 01, 2005 at 05:55:07PM +0100, Jakob Praher
wrote:
> 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]
Did you install the bytecode libraries into the C/C++ frontend lib
directory?

See

http://llvm.cs.uiuc.edu/docs/CFEBuildInstrs.html#instructions

7. Go back into the LLVM source tree proper. Rerun configure, using the
same options as the last time. This will cause the configuration to now
find the newly built llvm-gcc and llvm-g++ executables.

8. Rebuild your CVS tree. This shouldn't cause the whole thing to be
rebuilt, but it should build the runtime libraries. After the tree is
built, install the runtime libraries into your GCC front-end build tree.
These are the commands you need:

 % gmake
 % gmake -C runtime install-bytecode

-- 
Misha Brukman :: http://misha.brukman.net :: http://llvm.cs.uiuc.edu

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'
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev
Regards,

-- John T.

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

Misha Brukman wrote:
> Hey, Jakob --
> 
> On Tue, Mar 01, 2005 at 05:55:07PM +0100, Jakob Praher wrote:
> 
>>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]
> 
> 
> Did you install the bytecode libraries into the C/C++ frontend lib
> directory?
> 
thanks for the pointer. Yes I've done that, but in the new shell session 
I apparently forgot to set the LLVM_LIB_SEARCH_PATH.

now gccld isn't complaining anymore but the interpreter doesn't seem to 
like it still:

ERROR: Program used external function 'clock_gettime' which could not be
resolved!
lli((anonymous namespace)::PrintStackTrace()+0x1a)[0x862a53e]
lli((anonymous namespace)::SignalHandler(int)+0xd3)[0x862a807]
[0xffffe420]
lli(llvm::JIT::getPointerToFunction(llvm::Function*)+0x199)[0x837e863]
lli((anonymous 
namespace)::JITEmitter::getPointerToGlobal(llvm::GlobalValue*, void*, 
bool)+0xdb)[0x8380287]
lli((anonymous 
namespace)::JITEmitter::finishFunction(llvm::MachineFunction&)+0x18f)[0x838048f]
lli((anonymous 
namespace)::Emitter::runOnMachineFunction(llvm::MachineFunction&)+0x102)[0x840d448]
...


-- Jakob