[openssl-dev] Compiler requirements

[Short, Todd]

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
// tshort at akamai.com<mailto:tshort at 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 <kurt at roeckx.be<mailto:kurt at roeckx.be>> wrote:

On Tue, Jul 04, 2017 at 05:42:42PM +0200, Richard Levitte wrote:
In message <2f548b68de1c47dfaa6a3b0107080a2d at usma1ex-dag1mb1.msg.corp.akamai.com<mailto:2f548b68de1c47dfaa6a3b0107080a2d at usma1ex-dag1mb1.msg.corp.akamai.com>> on Tue, 4 Jul 2017 15:05:06 +0000, "Salz, Rich via openssl-dev" <openssl-dev at openssl.org<mailto:openssl-dev at openssl.org>> 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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