[LLVMdev] Problem with stock llvmc configuration for C

Reid Spencer rspencer at reidspencer.com
Mon Aug 14 00:29:17 PDT 2006

On Sun, 2006-08-13 at 21:18 +0200, Bram Adams wrote:
> Hi,
> Apparently there are two bugs in tools/llvmc/c:

This tool is, as yet, unfinished.

> /.../llvm/tools/llvmc/c:12: Error: Invalid top level configuration item
> /.../llvm/tools/llvmc/c:28: Error: Expecting a program name
> /.../llvm/tools/llvmc/c had 2 errors. Terminating.
> The first error relates to the following line(s):
>    lang.libs=%llvmgccdir%/lib %llvmgccdir%/lib \
>      %llvmgccdir%/lib/gcc/%llvmgccarch%
> ... the other one to:
>    translator.command=%llvmcc1% -quiet %in% -o %out% \
>    ...


> Apparently, %llvmgccdir% and %llvmcc1% are not recognized as a useful  
> variable by the llvmc configuration parser. 

Actually, they are. See tools/llvmc/ConfigurationDriver.cpp around line
304. Also, they are recognized by the lexer. Its more likely that when
you configured LLVM you didn't provide the --with-llvmgccdir= option.

> I found out in tools/ 
> llvmc/Configuration.cpp that two other library-related variables  
> exist, notably %libdir% and %libs%, but it's not clear what they do.

%libdir% expands to LLVM_LIBDIR which is the installation location of
LLVM libraries.
%libs% expands to the list of system (non-LLVM) libraries needed to link
with LLVM.
> Currently, I tried to solve the problems like this:
> lang.libs=%libdir%
> #this does not work: lang.libs=%libdir% %libs%

Did you install LLVM yet? If not, the directories are empty.

> ... and:
>    translator.command=llvm-gcc -quiet %in% -o %out% \
>    ...
> Only the solution to the second problem really seems to work, the  
> other one is accepted by llvmc, but I also get:
> /usr/bin/ld: Undefined symbols:
> _main
> collect2: ld returned 1 exit status
> llvmc: Action failed
> How can this library problem be solved?

Probably with "make install" from LLVM build directory and by
configuring LLVM with --with-llvmgccdir=.

Please note that llvmc is (still!) a work in progress. The configuration
code, in particular, is due for some improvement. Please see PR686
(http://llvm.org/bugs/show_bug.cgi?id=686) for further details.

> Kind regards,
> Bram Adams
> GH-SEL, INTEC, Ghent University (Belgium)

Hope it helps,


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