[Buildroot] [PATCH 2/2] package/imx-cst: new package

[Thomas Petazzoni]

Hello,

On Fri, 22 Apr 2022 12:09:00 +0200
Thomas Perrot <thomas.perrot at bootlin.com> wrote:

> > It looks like the only difference between 64 and 32 is in openssl
> > build
> > rule, and for x86 (host) targets only. We don't use this openssl rule
> > since we build host-openssl with our own rules. So maybe we can just
> > arbitrarily choose hard coded 'linux64'. It seems that
> > debian/Makefile
> > does that.  
> 
> Thanks for your review, I’m submitting a v3 with the OSTYPE variable
> hardcoded to linux64.

No, please don't. We're doing the build like this:

build:
        $(MAKE) -C $(CST_CODE_PATH)/obj.$(OSTYPE) build

And code/cst/code/obj.linux32/Makefile contains:

COPTIONS += -m32
LDOPTIONS += -m32

while code/cst/code/obj.linux64/Makefile contains

COPTIONS += -m64
LDOPTIONS += -m64

And I can definitely see the -m64 being added in the compiler flags
when doing a build on a x86-64 host (run the build with VERBOSE=1, you
will see).

So if you use linux64 unconditionally, the CST binaries will be built
with -m64, even on 32-bit host machines => bad.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com