[LLVMdev] llvm-gfortran problems

[Duncan Sands]

Hi Ashay,

> Sorry for the late reply. Using dragonegg worked well, thanks all!
>
> Just as a note... I had to use llvm-ld during the link step because
> gfortran could not link bitcode. Here's an example of the error shown
> when using gfortran instead of llvm-ld:
>
> $ ${GCC_4_5_0}/bin/gfortran hw.f -c -fplugin=
> ${DRAGONEGG_PLUGIN}/dragonegg.so -o hw.o -flto -emit-llvm -S
> $ ${LLVM_2_9}/bin/opt -mem2reg hw.o -o hw.o
> $ ${GCC_4_5_0}/bin/gfortran
> -fplugin=${DRAGONEGG_PLUGIN}/dragonegg.so ${GCC_4_5_0}/lib64/libgfortran.a
> hw.o -o hw
> hw.o: file not recognized: File format not recognized
> collect2: ld returned 1 exit status
>
> $ file hw.o
> hw.o: data
>
> Instead, using llvm-ld:
> $ ${LLVM_2_9}/bin/llvm-ld -native hw.o -o hw
> ${GCC_4_5_0}/lib64/libgfortran.a -lm
>
> llvm-gcc had the gold plugin. I wonder if there is any equivalent of
> that for dragonegg to be able to compile bitcode and native object code
> in a transparent manner.

can you please open a bug report about this.  Hopefully there is a
straightforward way to use the gold plugin with dragonegg, but I never
thought about it (I always do LLVM LTO "by hand").

Ciao, Duncan.

>
> Thanks again!
> Ashay
>
>
> On Wed, Aug 31, 2011 at 4:29 PM, Anton Korobeynikov
> <anton at korobeynikov.info <mailto:anton at korobeynikov.info>> wrote:
>
>     Hello
>
>      > I am not very familiar with Fortran programs. I saw a few
>     programs that had
>      > a "MAIN" subroutine defined, some others that did not. Am I missing
>      > something while compiling the code? Is there a different way to
>     compile
>      > bitcode (from Fortran programs) to a native binary?
>     For Fortran MAIN is indeed something similar to C main, but not
>     exactly the same.
>     You have to link the runtime library (libgfortran.a) in order to get
>     "proper" main, mak sure all stuff is initialized properly, etc.
>
>     --
>     With best regards, Anton Korobeynikov
>     Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
>
>
>
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