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digitalmars.D.ldc - merge-2.067: Cross compiling for AArch64

reply "Kai Nacke" <kai redstar.de> writes:
Hi!

The merge-2.067 is already in a good shape. I though I could try 
to cross compile to AArch64.
Normally I use real hardware for porting but AArch64 metal is 
still rare. Here is what I did:

I am using Gentoo Linux. First I emerged qemu with 
QEMU_USER_TARGETS="aarch64". There is nothing special here - it 
compiles a qemu-aarch64 binary.

The next step was to create a cross compiler with crossdev:
USE="-fortran -sanitize" crossdev -t aarch64-pc-linux-gnu
This created  gcc 4.8.4, binutils 2.25 and glibc 2.20 for AArch64.
It is a bit tricky to find a working triple and the right 
versions to use.

In order to create the D libraries for AArch64, I needed to 
change the file runtime/CMakeLists.txt in the LDC source.
Before the main configuration I added

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_C_COMPILER aarch64-pc-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER aarch64-pc-linux-gnu-c++)

This tells CMake to use the cross compiler. I also added 
-mtriple=aarch64-pc-linux-gnu to the D_FLAGS variable.
Run cmake and compile with make -k. You might need to run make 
twice. There is still a problem with core.stdc.stdarg and phobos 
has still errors because of this.

The libraries in the lib folder are compiled for AArch64. Create 
a "Hello World" program and compile it with:
bin/ldc2 -mtriple=aarch64-pc-linux-gnu 
-gcc=aarch64-pc-linux-gnu-gcc 
-L-rpath=/usr/lib/gcc/aarch64-pc-linux-gnu/4.8.4

(I add the -rpath= option because I do not know how to tell qemu 
where to find libgcc_s.so.)

To execute the binary just type
qemu-aarch64 -L /usr/aarch64-pc-linux-gnu ./hello

Success!
I could also run a unittest - e.g. core.bitop.

I hope this post helps if someone wants to cross compile to a 
different architecture.

Regards,
Kai
May 05 2015
next sibling parent reply Dan Olson <zans.is.for.cans yahoo.com> writes:
"Kai Nacke" <kai redstar.de> writes:


 The merge-2.067 is already in a good shape. I though I could try to
 cross compile to AArch64.


Nice.  I plan to follow in a month with hardware.
May 06 2015
parent reply "Kai Nacke" <kai redstar.de> writes:
On Thursday, 7 May 2015 at 03:44:38 UTC, Dan Olson wrote:

 "Kai Nacke" <kai redstar.de> writes:


 The merge-2.067 is already in a good shape. I though I could 
 try to
 cross compile to AArch64.


 Nice.  I plan to follow in a month with hardware.


Note that the vararg code is currently horrible broken (ICE). 
Which hardware do you want to use? iPhone?

Regards,
Kai
May 07 2015
parent reply Dan Olson <zans.is.for.cans yahoo.com> writes:
"Kai Nacke" <kai redstar.de> writes:


 On Thursday, 7 May 2015 at 03:44:38 UTC, Dan Olson wrote:

 "Kai Nacke" <kai redstar.de> writes:


 The merge-2.067 is already in a good shape. I though I could try to
 cross compile to AArch64.


 Nice.  I plan to follow in a month with hardware.


 Note that the vararg code is currently horrible broken (ICE). Which
 hardware do you want to use? iPhone?


Yeah - iPhone
May 08 2015
parent Dan Olson <zans.is.for.cans yahoo.com> writes:
Dan Olson <zans.is.for.cans yahoo.com> writes:


 "Kai Nacke" <kai redstar.de> writes:


 On Thursday, 7 May 2015 at 03:44:38 UTC, Dan Olson wrote:

 "Kai Nacke" <kai redstar.de> writes:


 The merge-2.067 is already in a good shape. I though I could try to
 cross compile to AArch64.


 Nice.  I plan to follow in a month with hardware.


 Note that the vararg code is currently horrible broken (ICE). Which
 hardware do you want to use? iPhone?


 Yeah - iPhone


Oh, and an Android arm64 tablet too.  I have to wait until mid-summer
though because I am in a busy spell right now.
May 18 2015
prev sibling next sibling parent reply "Temtaime" <temtaime gmail.com> writes:
It's good to hear about aa64. But what about win32?
May 07 2015
parent reply "Kai Nacke" <kai redstar.de> writes:
On Thursday, 7 May 2015 at 15:15:01 UTC, Temtaime wrote:

 It's good to hear about aa64. But what about win32?


Win32 exception handling is currently added to LLVM. If this is 
done I will create a native Win32 client.

(Yes, I consider the Windows platform important. But the 
exception handling stuff is very complicated and easily broken...)

Regards,
Kai
May 07 2015
parent "Temtaime" <temtaime gmail.com> writes:
I'm glad to hear that :)
I'll try to build ldc with llvm trunk today i think as win64 
target.
May 08 2015
prev sibling parent reply "Johan Engelen" <j j.nl> writes:
Great stuff. I think you should add this to the wiki somewhere!

-Johan
May 07 2015
parent "Kai Nacke" <kai redstar.de> writes:
On Thursday, 7 May 2015 at 19:08:13 UTC, Johan Engelen wrote:

 Great stuff. I think you should add this to the wiki somewhere!

 -Johan


I added the status to the wiki. Thanks for the hint.

Regards,
Kai
May 07 2015