ArchLinux:ARM:Programming

== Programming ==
=== Cross-compiling ===
==== Setup ====
===== x86_64 <SERVER> =====
<pre>
$ yaourt -S arm-linux-gnueabi-gcc arm-linux-gnueabi-binutils arm-linux-gnueabi-eglibc

---PKGBUILD (eglibc)---
build() {
...
  export CFLAGS="${CFLAGS} -U_FORTIFY_SOURCE  -mlittle-endian -mhard-float -O2"
...
}
---PKGBUILD---

---PKGBUILD (gcc)---
build() {
...
        --disable-softfloat \
        --with-float=hard \
...
}
---PKGBUILD---
</pre>
==== Usage ====
===== x86_64 <SERVER> =====
<pre>
$ export CC="arm-linux-gnueabi-gcc"
$ export LD="arm-linux-gnueabi-ld"
$ export CXX="arm-linux-gnueabi-g++"
$ export AR="arm-linux-gnueabi-ar"
$ export AS="arm-linux-gnueabi-as"
$ export LINK="g++"

$ makepkg -A --config arm-makepkg.conf

$ scp package-armv6h.pkg.tar.xz <login>@RasPi:~/tmp
</pre>
* arm-makepkg.conf
<pre>
CARCH="armv6h"
CHOST="armv6l-unknown-linux-gnueabihf"
CFLAGS="-march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
CXXFLAGS="-march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
LDFLAGS=""
MAKEFLAGS="-j9"
BUILDENV=(fakeroot !distcc color !ccache check !sign)
DISTCC_HOSTS=""
OPTIONS=(!strip docs libtool emptydirs zipman purge !upx)
</pre>

===== ARM <TARGET> =====
<pre>
$ yaourt -U ~/tmp/package-armv6h.pkg.tar.xz
</pre>

=== Distributed compilation [DRAFT] ===
==== ARM <MASTER> ====
<pre>
# pacman -S base-devel distcc
# pacman -S gdb ddd

# nano /etc/makepkg.conf
# nano /etc/distcc/hosts
</pre>
===== /etc/makepkg.conf =====
<pre>
CARCH="armv6h"
CHOST="armv6l-unknown-linux-gnueabihf"
CFLAGS="-march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -$
CXXFLAGS="-march=armv6 -mfloat-abi=hard -mfpu=vfp -O2 -pipe -fstack-protector --param=ssp-buffer-size=4$
LDFLAGS=""
MAKEFLAGS="-j3"
BUILDENV=(fakeroot distcc color !ccache check !sign)
DISTCC_HOSTS="<SERVER>"
</pre>

===== /etc/distcc/hosts =====
<pre>
<SERVER>
</pre>
==== x86_64 <SERVER> ====
<pre>
# pacman -S distcc

# nano /etc/makepkg.conf
# nano /etc/conf.d/distccd
# nano /etc/hosts.allow

# systemctl enable distccd
# systemctl start distccd
</pre>
===== /etc/makepkg.conf =====
<pre>
MAKEFLAGS="-j9"
</pre>
===== /etc/conf.d/distccd =====
<pre>
DISTCC_ARGS="--user nobody --allow 192.168.1.0/24"
</pre>

===== /etc/hosts.allow =====
<pre>
distccd:192.168.1.
</pre>

=== Sample ===
==== Calculator ====
===== cross compile =====
http://blog.cyring.fr/wp-content/uploads/2012/11/ddd-ARM_001-300x239.png
<pre>
$ cd
$ nano src/fcalc.c

$ export DISTCC_VERBOSE=1
$ export DISTCC_HOSTS='<SERVER>'

$ distcc arm-linux-gnueabi-gcc -g -c src/fcalc.c
</pre>

===== debug =====
<pre>
$ ddd bin/fcalc
</pre>
===== Source code =====
* C only, no ASM
fcalc.c : [http://code.cyring.fr/FTS/Source/C/fcalc.c download] [http://code.cyring.fr/FTS/?PATH=Source/C/fcalc.c view]
* with ASM inline into C code
fcalc2.c : [http://code.cyring.fr/FTS/Source/ASM/fcalc2.c download] [http://code.cyring.fr/FTS/?PATH=Source/ASM/fcalc2.c view]
* with ASM inline into C code, and selected registers
fcalc3.c : [http://code.cyring.fr/FTS/Source/ASM/fcalc3.c download] [http://code.cyring.fr/FTS/?PATH=Source/ASM/fcalc3.c view]
* using the vfp coprocessor
fcalc5.c :  [http://code.cyring.fr/FTS/Source/ASM/fcalc5.c download] [http://code.cyring.fr/FTS/?PATH=Source/ASM/fcalc5.c view]