llvm dev - Dec 2010 - [LLVMdev] Fwd: wxGTK sample app compiled by llvm crashes on arm

Thanx for a prompt reply.

I will definitely try llvm 2.8 as per your suggestion.

However Step 1 and Step 2 are working for me in case of a simple hello world
program on arm processor . Similarly I am able to run a GTK application on
arm. However while running wxGTKwidget app it crashes while allocation of
memory. As  I mentioned earlier, If I explicitly allocate memory using new
operation then everything works fine. Please let me know why do we actually
fail without using new, that to a arbitrary pointer which is never used in
the program.

On Fri, Dec 3, 2010 at 6:31 PM, Anton Korobeynikov
<anton at korobeynikov.info>wrote:
> > I am using llvm-2.7 to run a native(executable) on a arm processor.
> ARM was pretty much broken in 2.7. Consider using at least 2.8
>
> > ../llvm-gcc-4.2-2.7.source/configure
--prefix=/home//gcc-disable-shared
> --enable-languages=c++,c --enable-checking --enable-llvm=/home/
llvm-objects
> --disable-bootstrap --disable-multilib
> You have to configure llvm-gcc as cross-arm compiler.
>
> > Step 1. llvm-gcc -O3 -emit-llvm minimal.cpp -c -o minimal.bc `wxconfig
> –cxxflags`
> > Step 2. llc minimal.bc  –march=arm –o minimal.s   (for generating arm
> assembly code)
> This won't work. You're trying to codegen x86 IR for ARM.
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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> memory. As  I mentioned earlier, If I explicitly allocate memory using new
> operation then everything works fine. Please let me know why do we actually
> fail without using new, that to a arbitrary pointer which is never used in
> the program.
x86 and ARM have different ABIs, so you was just lucky. You can read
e.g. http://llvm.org/docs/FAQ.html#platformindependent for more
information.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Thanx again ..
By the way I wanted to tell you that we have the same platform(linux) on
host and target.

On Mon, Dec 6, 2010 at 1:42 PM, Anton Korobeynikov
<anton at korobeynikov.info>wrote:
> > memory. As  I mentioned earlier, If I explicitly allocate memory using
> new
> > operation then everything works fine. Please let me know why do we
> actually
> > fail without using new, that to a arbitrary pointer which is never
used
> in
> > the program.
> x86 and ARM have different ABIs, so you was just lucky. You can read
> e.g. http://llvm.org/docs/FAQ.html#platformindependent for more
> information.
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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> You said that, You have to configure llvm-gcc as cross-arm compiler.
> I am not clear what does it actually mean ??
> For us , intel is the host machine and arm is the target machine .
For this you need the cross-compiler (same as for normal gcc). So,
basically configure llvm-gcc as a cross-compiler
for your target platform the same way as you're doing this with the
ordinary gcc.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

---------- Forwarded message ----------
From: Anton Korobeynikov <anton at korobeynikov.info>
Date: Wed, Dec 8, 2010 at 16:31
Subject: Re: [LLVMdev] wxGTK sample app compiled by llvm crashes on arm
To: ankur jain <samyak3 at gmail.com>


Hello,
> I still have a query. Using llvm-gcc as cross-arm compiler will generate
> bytecode specific to arm.
> These bytecodes will work only on arm based platforms.Is it so ??
Yes, as you already checked for x86 bytecode on ARM :)
> This would
> mean that we cannot have platform independent bytecodes as found in case of
> java. We would be grateful to you for any comment on this.
That's correct. C/C++ are not target neutral languages. You can read
http://llvm.org/docs/FAQ.html#platformindependent for some more info.

--
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University



-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University