Re: [openssl-dev] Compiler requirements

[Short, Todd via openssl-dev]

I think it’s more a matter of using new features in C11 that preclude 
compilation on older platforms, rather than the use of a C11 compiler itself.

--
-Todd Short
// tsh...@akamai.com
// "One if by land, two if by sea, three if by the Internet."

On Jul 4, 2017, at 1:34 PM, Kurt Roeckx > 
wrote:

On Tue, Jul 04, 2017 at 05:42:42PM +0200, Richard Levitte wrote:
In message 
<2f548b68de1c47dfaa6a3b0107080...@usma1ex-dag1mb1.msg.corp.akamai.com>
 on Tue, 4 Jul 2017 15:05:06 +, "Salz, Rich via openssl-dev" 
> said:

openssl-dev> > beldmit> What is the minimal version of the compiler to build 
openssl?
openssl-dev> > beldmit> Is it still required C89 compatibility or C99 standard 
can be used?
openssl-dev> > beldmit>
openssl-dev> > beldmit> Unfortunately, I did not find these requirements in 
documentation.
openssl-dev> >
openssl-dev> > At the beginning of INSTALL, you will find a set of 
requirements.  On of them
openssl-dev> > is "an ANSI C compiler".
openssl-dev>
openssl-dev> That doesn't answer the question :)  Which version of ANSI C?

Ah, you're right, "ANSI C" is a bit of a loose target depending on who
you ask.  As far as I know, we refer to C89/C90 (they are essentially
the same for our intents and purposes).

openssl-dev> I believe C89 is written down somewhere.

C89 is written nowhere in the source at least, nor is C90.  We should
probably clarify that.


Speculating a bit, it's probably safe to say that C95 compiler is fine
as well.  C99, not so much, there's too much risk that we start
excluding some platforms if we start using its features.  Anyway, I
don't think it's safe to upgrade our minimum expectations now.
OpenSSL 1.2.0 would be a good time for such re-evaluations.

I think the minimum requirement is C89 + support for "long long".

A newer version shouldn't be a problem, it should work with a
compiler that defaults to C11 for instance.


Kurt

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Re: [openssl-dev] Compiler requirements

[Kurt Roeckx]

On Tue, Jul 04, 2017 at 05:42:42PM +0200, Richard Levitte wrote:
> In message 
> <2f548b68de1c47dfaa6a3b0107080...@usma1ex-dag1mb1.msg.corp.akamai.com> on 
> Tue, 4 Jul 2017 15:05:06 +, "Salz, Rich via openssl-dev" 
>  said:
> 
> openssl-dev> > beldmit> What is the minimal version of the compiler to build 
> openssl?
> openssl-dev> > beldmit> Is it still required C89 compatibility or C99 
> standard can be used?
> openssl-dev> > beldmit>
> openssl-dev> > beldmit> Unfortunately, I did not find these requirements in 
> documentation.
> openssl-dev> > 
> openssl-dev> > At the beginning of INSTALL, you will find a set of 
> requirements.  On of them
> openssl-dev> > is "an ANSI C compiler".
> openssl-dev> 
> openssl-dev> That doesn't answer the question :)  Which version of ANSI C?
> 
> Ah, you're right, "ANSI C" is a bit of a loose target depending on who
> you ask.  As far as I know, we refer to C89/C90 (they are essentially
> the same for our intents and purposes).
> 
> openssl-dev> I believe C89 is written down somewhere.
> 
> C89 is written nowhere in the source at least, nor is C90.  We should
> probably clarify that.
> 
> 
> Speculating a bit, it's probably safe to say that C95 compiler is fine
> as well.  C99, not so much, there's too much risk that we start
> excluding some platforms if we start using its features.  Anyway, I
> don't think it's safe to upgrade our minimum expectations now.
> OpenSSL 1.2.0 would be a good time for such re-evaluations.

I think the minimum requirement is C89 + support for "long long".

A newer version shouldn't be a problem, it should work with a
compiler that defaults to C11 for instance.


Kurt

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Re: [openssl-dev] Compiler requirements

[Richard Levitte]

In message 
<2f548b68de1c47dfaa6a3b0107080...@usma1ex-dag1mb1.msg.corp.akamai.com> on Tue, 
4 Jul 2017 15:05:06 +, "Salz, Rich via openssl-dev" 
 said:

openssl-dev> > beldmit> What is the minimal version of the compiler to build 
openssl?
openssl-dev> > beldmit> Is it still required C89 compatibility or C99 standard 
can be used?
openssl-dev> > beldmit>
openssl-dev> > beldmit> Unfortunately, I did not find these requirements in 
documentation.
openssl-dev> > 
openssl-dev> > At the beginning of INSTALL, you will find a set of 
requirements.  On of them
openssl-dev> > is "an ANSI C compiler".
openssl-dev> 
openssl-dev> That doesn't answer the question :)  Which version of ANSI C?

Ah, you're right, "ANSI C" is a bit of a loose target depending on who
you ask.  As far as I know, we refer to C89/C90 (they are essentially
the same for our intents and purposes).

openssl-dev> I believe C89 is written down somewhere.

C89 is written nowhere in the source at least, nor is C90.  We should
probably clarify that.


Speculating a bit, it's probably safe to say that C95 compiler is fine
as well.  C99, not so much, there's too much risk that we start
excluding some platforms if we start using its features.  Anyway, I
don't think it's safe to upgrade our minimum expectations now.
OpenSSL 1.2.0 would be a good time for such re-evaluations.

Cheers,
Richard

-- 
Richard Levitte levi...@openssl.org
OpenSSL Project http://www.openssl.org/~levitte/
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Re: [openssl-dev] Compiler requirements

[Salz, Rich via openssl-dev]

> beldmit> What is the minimal version of the compiler to build openssl?
> beldmit> Is it still required C89 compatibility or C99 standard can be used?
> beldmit>
> beldmit> Unfortunately, I did not find these requirements in documentation.
> 
> At the beginning of INSTALL, you will find a set of requirements.  On of them
> is "an ANSI C compiler".

That doesn't answer the question :)  Which version of ANSI C?

I believe C89 is written down somewhere.
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Re: [openssl-dev] Compiler requirements

[Richard Levitte]

In message  
on Tue, 4 Jul 2017 11:57:15 +0300, Dmitry Belyavsky  said:

beldmit> Hello,
beldmit> 
beldmit> What is the minimal version of the compiler to build openssl?
beldmit> Is it still required C89 compatibility or C99 standard can be used?
beldmit> 
beldmit> Unfortunately, I did not find these requirements in documentation.

At the beginning of INSTALL, you will find a set of requirements.  On
of them is "an ANSI C compiler".

Note that this primary covers language syntax.  We do use libraries
that came later, but then also guard them with a suitable check of
__STDC_VERSION__ or similar, and use or provide alternate
implementations when necessary.

Cheers,
Richard

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OpenSSL Project http://www.openssl.org/~levitte/
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