Date: Sat, 16 Jul 2016 22:08:53 +0700
From: "Tuan M. Hoang" <tmhoang@flatglobe.org>
To: "Tuan M. Hoang" <tmhoang@flatglobe.org>
Cc: "Timo Teras" <timo.teras@iki.fi>, 
	"alpine-devel" <alpine-devel@lists.alpinelinux.org>
Message-ID: <155f440c618.129c9f0aa5155.5728200182511575692@flatglobe.org>
In-Reply-To: <155e6497a8e.11ad265cf269464.7355344611305011615@flatglobe.org>
References: <155a8e57d76.f37920c130996.6728092923369604578@flatglobe.org>
	<20160703225319.0ce46f62@vostro>
	<155b28d7dfa.ca28fe6d67425.5841089419777612642@flatglobe.org>
	<20160705172656.788ec089@vostro.util.wtbts.net> <20160706172836.74bab5d1@vostro> <155e6497a8e.11ad265cf269464.7355344611305011615@flatglobe.org>
Subject: Re: [alpine-devel] Porting Alpine scripts
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Hi,

I have successfully built armv7 cross-toolchain using createcross-toolchain.sh.

About crossbuild-alpine-bootstrap.sh, I have 2 questions:

1. At cross-building busybox (in the for loop), there was an error of missing linux/kd.h header, even though /usr/include/linux/kd.h is present in my Alpine build machine. So I have to install the newly cross-built linux-headers package from previous loop, like this:

diff --git a/crossbuild-alpine-bootstrap.sh b/crossbuild-alpine-bootstrap.sh
--- a/crossbuild-alpine-bootstrap.sh
+++ b/crossbuild-alpine-bootstrap.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-TARGET_ARCH=aarch64
+export TARGET_ARCH=armv7
 
 export ABUILD_CREATECROSS_CONF=$PWD/abuild-createcross-$TARGET_ARCH.conf
 export ABUILD_CONF=$PWD/abuild-crossbuild-$TARGET_ARCH.conf
@@ -47,6 +47,10 @@ for PKG in linux-headers musl libc-dev \
 	cd $APORTS/main/$PKG
 	BOOTSTRAP=bootimage abuild -r || exit 1
 
+	if [ "$PKG" = "linux-headers" ]; then
+		${SUDO_APK} -u --root "$CBUILDROOT" --repository "$REPODEST_TARGET/main" --arch "$TARGET_ARCH" add linux-headers | exit 1
+	fi
+
 	if [ "$PKG" = "libc-dev" ]; then
 		# install libc-dev, as implicit but mandatory dependency
 		${SUDO_APK} -u --root "$CBUILDROOT" add libc-dev || exit 1

How about your procedures?

2. At cross-building binutils step, I have the error : 

./a.out: cannot execute binary file: Exec format error

I checked the configure log (http://pastebin.com/t9QS9DZZ) and it looks like the build, host, target machines are all 'armv7-alpine-linux-muslgnueabihf', which is incorrect I guess. I think the build machine should be 'x86_64-alpine-linux-musl' because we are using a cross-compiler running on x86_64 targeting armv7. So from its point of view, the build machine is x86_64, it builds program to run on host machine (armv7), and I am not really sure what to pass as target machine, maybe armv7 too.

If I try to pass to binutils configure script with '--build=x86_64-alpine-linux-musl --host=armv7-alpine-linux-muslgnueabihf --target=armv7-alpine-linux-muslgnueabihf ' then it configure and build just fine.

Doing the same strategy with make, it failed.

What do you think ?

3. I am curious about CBUILD variable. Where is it defined? Can't find in your script nor (any) APKBUILD nor APKBUILD reference documentation/webpage. In cross-building binutils case, it is set to 'armv7-alpine-linux-muslgnueabihf', same as CHOST.

By the way, your work is beautiful.
Thank you.


 ---- On Thu, 14 Jul 2016 05:03:43 +0700 Tuan M. Hoang <tmhoang@flatglobe.org> wrote ---- 
 >  
 > Would you mind sharing your building log ? I just need to make sure my steps are correct. 
 > Thank you. 
 >  
 > --- 
 > Unsubscribe:  alpine-devel+unsubscribe@lists.alpinelinux.org 
 > Help:         alpine-devel+help@lists.alpinelinux.org 
 > --- 
 >  
 > 



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