[erlang-questions] R16 + Centos + Crypto + ESL Package

[Andreas Schultz]

Hi,

----- Original Message -----
> Данила Фед�щин <danilagamma@REDACTED> wrote:
> >
> >After some digging we found that `CFLAGS="-DOPENSSL_NO_EC=1"` rewrites
> >`CFLAGS="-g -O2"`, which was the culprit of slowdown.
> 
> Ouch, I knew there was a reason I always try to avoid passing C compiler
> flags to OTP's 'configure'.:-)
> 
> >So the question is: what is the best way to 'append' CFLAGS option, rather
> >then providing '-DOPENSSL_NO_EC=1 -g -O2' assuming that we've appended
> >correct default options?
> 
> The general, semi-ugly method I use when I need to pass some C compiler
> flags is to create a wrapper, a la
> 
> $ cat /usr/local/softfloat/bin/gcc
> #!/bin/sh
> 
> exec /usr/local/gcc-4.2.4/bin/gcc -msoft-float "$@"
> $
> 
> - and then make sure to have the directory with the wrapper early on in
> $PATH. If I'm really ambitious I may name the wrapper gcc-<foo>-<bar>
> and pass that as CC (IIRC) to 'configure'.
> 
> For this particular case though, if you aren't afraid to touch the
> source, you can apply this diff instead:
> 
> --- lib/crypto/c_src/crypto.c   (revision 69183)
> +++ lib/crypto/c_src/crypto.c   (revision 69184)
> @@ -77,7 +77,8 @@
>  #if OPENSSL_VERSION_NUMBER >= 0x009080ffL \
>         && !defined(OPENSSL_NO_EC) \
>         && !defined(OPENSSL_NO_ECDH) \
> -       && !defined(OPENSSL_NO_ECDSA)
> +       && !defined(OPENSSL_NO_ECDSA) \
> +       && !defined(OPENSSL_NO_EC2M)
>  # define HAVE_EC
>  #endif
>  
> 
> I was actually about to report it as a bug fix, but found that R17 - uh,
> 17? - has much better one (it disables *only* the EC2M stuff which is
> all that is missing on "current" CentOS/RHEL at least) - thanks to the
> OTP team for that! - "in advance", we're not ready for "17" yet. If you
> are, I suggest that you try it.

The R17 version was added by this pull request:
https://github.com/erlang/otp/pull/120

You could try to apply this to R16 as well.

Andreas

> 
> --Per Hedeland
> 
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-- 
-- 
Dipl. Inform.
Andreas Schultz