[LLVMdev] llvm-gfortran problems

[Dmitry N. Mikushin]

Sorry, at what step do you need archive? llc emits binary, it does not
perform any linking, thus it does not need anything except the input
bytecode file. Then during linking you can link whatever archives of
binaries you want.

2011/9/13 Ashay Rane <ashay.rane at tacc.utexas.edu>:
> Thats correct. But using llc becomes a problem when I have archives (.a
> files). I could, in theory, extract its contents to a tempdir and then use
> llc and link but just wondering if there is a more elegant solution.
> Ashay
>
> On Mon, Sep 12, 2011 at 3:00 PM, Dmitry N. Mikushin <maemarcus at gmail.com>
> wrote:
>>
>> Ashay,
>>
>> If I understand correctly, in hw.o you would have llvm bytecode, while
>> linker expects regular object binary. Probably first you need to emit
>> asm out of bytecode using llc?
>>
>> - D.
>>
>> 2011/9/12 Ashay Rane <ashay.rane at tacc.utexas.edu>:
>> > Hello,
>> > 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.
>> > Thanks again!
>> > Ashay
>> >
>> > On Wed, Aug 31, 2011 at 4:29 PM, Anton Korobeynikov
>> > <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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>> >
>> >
>
>