[cfe-dev] linking question

[Shantonu Sen]

This is correct behavior. If you have any C++ object files, you should  
use g++ (or whatever c++ compiler you used) for linking, since it will  
likely implicitly add libraries like the standard C++ library.  
Alternatively, you can try using clang for the link and adding -lstdc+ 
+, but there may be other things necessary.

Shantonu

Sent from my MacBook

On Mar 29, 2009, at 8:06 PM, रजनीश wrote:

> Sorry for what might be naive question.
>
>
> So I have the following command:
>
> /usr/bin/g++ -I. -I./include -I/usr/include/libxml2 -arch i386 -fno-
> common -pipe -O3 -g -Wall -fexceptions -Wno-parentheses -Wno-
> deprecated-declarations -Werror array.o bignum.o class.o compar.o
> complex.o enum.o enumerator.o error.o eval.o file.o load.o proc.o gc.o
> hash.o inits.o io.o math.o numeric.o object.o pack.o parse.o prec.o
> dir.o process.o random.o range.o rational.o re.o regcomp.o regenc.o
> regerror.o regexec.o regparse.o regsyntax.o ruby.o set.o signal.o
> sprintf.o st.o string.o struct.o time.o transcode.o util.o variable.o
> version.o thread.o id.o objc.o bs.o encoding.o main.o dln.o dmyext.o
> enc/ascii.o vm_eval.o miniprelude.o gc-stub.o roxor.o -L/Volumes/Rafi/
> llvm/Release/lib  -lpthread -lm /Volumes/Rafi/llvm/Release/lib/
> LLVMX86CodeGen.o -lLLVMSelectionDAG -lLLVMAsmPrinter /Volumes/Rafi/
> llvm/Release/lib/LLVMExecutionEngine.o /Volumes/Rafi/llvm/Release/lib/
> LLVMJIT.o -lLLVMCodeGen -lLLVMScalarOpts -lLLVMTransformUtils -
> lLLVMipa -lLLVMAnalysis -lLLVMTarget -lLLVMCore -lLLVMSupport -
> lLLVMSystem -lpthread -ldl -lxml2 -lobjc -lffi -lauto -framework
> Foundation -o miniruby
>
>
> And when I replace g++ with clang, I get a lot of unresolved symbols
> pertaining to c++ objects in one .o file (rest of .o are created via
> clang).
> Is this reasonable or am I doing something wrong?
>
> I did notice that -flto and -O4 is disabled in clang.  Is this going
> to be in for 1.0?
> I want to try to see if it makes any difference on the above.  Do I
> need to update my system ld with what?
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