Re: [Tinycc-devel] [PATCH] allow to tell a target ARCH to a configure script

[Thomas Preud'homme]

Le mardi 30 décembre 2014, 11:05:15 Sergey Korshunoff a écrit :
> Problem: configure in 32bit userspace running on 64bit kernel is
> trying to compile tcc for ARCH=x86_64. Expecting behavior: to
> configure a tcc for ARCH=x86
> 
> This patch will allow to specify/configure a target cpu. Examples:
>       ARCH=x86 ./configure
>       ARCH=x86_64 ./configure
> 
> If ARCH is not specified then try to detect a current cpu type by
> examining arch of the host_cc.

The principle is nice but the code style looks different from the rest and a 
bit complicated for what it is. Why using a subscript for instance? Why not 
nesting if?

Finally, you could instead of using readelf use a carefully crafted conftest 
that would give you whether userspace is 32bit of 64bit. The structure would 
then look like this:

if ARCH is defined, then use it
else use uname

if cpu is x86_64 and conftest gives 32bit, cpu=i386.

What do you think?

Best regards,

Thomas