Compile for arm-linux-gnueabihf?

[giorgio130]

Hi! since Kobo switched to armhf from armel in their latest firmware release, I'm trying to compile koreader for this architecture. I tried to simply modify Makefile.defs putting CHOST?=arm-linux-gnueabihf in it, but it looks like this setting is respected only partially since in the end the linker seems to complain that part of the binaries are for armhf and part of them are for armel (looks like thirdparty libraries are still built for armel). What else should I change?

[giorgio130]

I've solved this, it required a little more than a "make clean" since it didn't actually remove all the cruft. In the end I also changed to ARM_ARCH:=-march=armv6j -mtune=arm1136jf-s -mfpu=vfp -mfloat-abi=hard -marm

[houqp]

oh, cool, do we also need to adapt the makefile?

[hwhw]

Hm. Shouldn't specifying CHOST on the make command line be enough? like e.g.

$ make CHOST=arm-linux-gnueabihf

That way, all subsequent definitions via ?= and := should be overridden, I
think. Or was it via environment variable (like in "CHOST=... make")? I'm
pretty sure I switched between compilers that way pretty easily.

BTW, we should identify what cruft is left by "make clean" - as that may
give us strange bugshere and there when not working properly.

[giorgio130]

It looked like thirdparty libs and luajit were not properly cleaned. Yes, specifying CHOST looks to be enough, but I don't think you can change to -mfloat-abi=hard by a command line switch, right?

[hwhw]

Yes, that may pose some problems, I guess. I'm not too sure, though. Isn't
that the default value for a hf-toolchain, though?

[giorgio130]

it is but in Makefile.defs it is specified:
ARM_ARCH:=-march=armv6j -mtune=arm1136jf-s -mfpu=vfp -mfloat-abi=softfp -marm
so if you don't change it in the end you get a strange hybrid I guess. I didn't try though to leave it unchanged and see if the produced binary would run.

[hwhw]

Oh, right. It probably won't run, no - unsure if it would even link...

[houqp]

yeah, we can change ARM_ARCH according to environment. So if you think it's necessary, we should do so.

btw, what command did you run to clean? make clean in koreader or koreader-base?