[LLVMdev] Error while linking LLVM files

Wojciech Daniło wojtek.danilo.ml at gmail.com
Wed Nov 7 09:31:29 PST 2012


Thank you, it works! :)


2012/11/6 Eli Friedman <eli.friedman at gmail.com>

> On Tue, Nov 6, 2012 at 6:38 AM, Wojciech Daniło
> <wojtek.danilo.ml at gmail.com> wrote:
> > Hi!
> > I'm trying to learn LLVM and I want to compile the Kaleidoscope compiler.
> > according to:
> > http://llvm.org/docs/tutorial/LangImpl3.html
> >
> > I'm compiling it with:
> > clang++ -g -O3 test.cpp `llvm-config --cppflags --ldflags --libs core` -o
> > toy
> >
> > and it indeed works.
> > The problem is that when using eclipse it forces me to divide the
> > compilation into two steps:
> >
> > g++ -O0 -g3 -Wall -c -fmessage-length=0 `llvm-config --cppflags --ldflags
> > --libs core` -MMD -MP -MF"src/lunac.d" -MT"src/lunac.d" -o "src/test.o"
> > "../src/test.cpp"
> > (which compiles fine)
> >
> > and:
> >
> > Invoking: Cross G++ Linker
> > g++ `llvm-config --cppflags --ldflags --libs core` -o "test"
>  ./src/test.o
> >
> > which gives me error:
> > ./src/test.o: In function `NumberExprAST::Codegen()':
> > /home/wdanilo/dev/lunac/Debug/../src/test.cpp:358: undefined reference to
> > `llvm::APFloat::APFloat(double)'
> > /home/wdanilo/dev/lunac/Debug/../src/test.cpp:358: undefined reference to
> > `llvm::getGlobalContext()'
> > /home/wdanilo/dev/lunac/Debug/../src/test.cpp:358: undefined reference to
> > `llvm::ConstantFP::get(llvm::LLVMContext&, llvm::APFloat const&)'
> > [...]
> >
> > Why Linker is not working with these flags? How can I fix it?
>
> When you're passing arguments to the linker, the order matters.  Try
> reordering the command-line so test.o comes first.
>
> -Eli
>
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