[LLVMdev] llvm-gfortran problems

[Dmitry N. Mikushin]

Hi Ashay,

Do you need specifically llvm-gfortran that is based on gcc 4.2? Since
that, DragonEgg has been introduced - a powerful plugin to gcc that
makes it possible to utilize regular gcc compilers as frontends to
llvm: http://dragonegg.llvm.org/

It generates Fortran90 programs for me very well.

- D.

2011/9/1 Ashay Rane <ashay.rane at tacc.utexas.edu>:
> Hello,
> I have been trying to compile a few small programs
> [http://www.esm.psu.edu/~ajm138/fortranexamples.html] using llvm-gfortran.
> Since I run my own pass on the generated bitcode, I have had to split the
> compilation process into using llvm-gfortran, opt and then llvm-ld (for
> linking, as I do with C/C++ programs). For now, I'll drop the `opt'
> statement. Here's what I see while compiling:
> $ llvm-gfortran -c sample.f -emit-llvm -o sample.o
> $ lli sample.o
> 'main' function not found in module
> $ llvm-dis < sample.o | grep main | wc -l
> 0
> $ llvm-dis < sample.o | grep MAIN | wc -l
> 1
> $ llvm-ld -native sample.o -L ~/apps/llvm-gcc/lib64/ -lgfortran
> /usr/lib/../lib64/crt1.o: In function `_start':
> (.text+0x21): undefined reference to `main'
> collect2: ld returned 1 exit status
> llvm-ld:
> 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?
> Thanks,
> Ashay
>
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