Re: [uClinux-dev] toolchain for c++ on coldfire

angelo Fri, 29 Apr 2016 00:28:54 -0700

Hi,

i have the 5.3.0 c and c++ toolchain up and running.
Last issue i had was compiling errors building a separate
applications in c++, related to usleep undefined.

To have usleep included in the recent uClibc library, you need

UCLIBC_SUSV3_LEGACY=y
UCLIBC_SUSV3_LEGACY_MACROS=y

Many thanks for this great script.

Could compile full uClinux-dist but with a recent kernel 4.5 (> 3.5).

Still a last issue,
if i compile a c++ app with this 5.3.0 toolchain, and upload it to a
mcf5307 system, (kernel built with older toolchain and system
with older uClibc) i get a strange
"ILL" console message after execution, and program exits.

am i doing something wrong ?

Thanks,
regards,
angelo

On 29/04/2016 07:22, Greg Ungerer wrote:

Hi Waldemar,

On 29/04/16 05:10, Waldemar Brodkorb wrote:

Hi Greg,
Greg Ungerer wrote,

Hi Angelo,

On 20/04/16 04:14, angelo wrote:

infinite thanks.

Do you maybe have also the
gcc-5.3.0-fix-libgcc-build.patch ?

Yep, attached.

Can you explain why this patch is required and why
the atomic code failes to compile?

It is required because it fails to compile without it :-)
I don't know why it fails, I didn't dig any further into it.

Do you mind to add some notes/comments to 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53833

I don't see I can add any value there. I googled and found
Larry's bug report and fix at this link. The above patch is
exactly Larry's solution from that thread.

There is another workaround in your script:
     find ${GCCLIB} -name libgcc.a -print | while read t
        do
                ${TARGET}-ar dv "$t" _ctors.o
        done

What kind of pain this is causing?

I don't know. It was in that script before I started using it.
It hasn't caused any problems with it there so I have never
removed it.

Both works fine for me and the second workaround
is simpler than my old way via a extra gcc spec file
and a gcc-wrapper script.

So when you are compiling a modern gcc for m68k-uclinux you
don't hit the problem compiling linux-atomic.c?

Regards
Greg


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Re: [uClinux-dev] toolchain for c++ on coldfire

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