[openssl-users] Architecture-specific headers

[Kim Gräsman]

Hi Michael,

On Tue, Oct 18, 2016 at 2:21 PM, Michael Wojcik
<Michael.Wojcik at microfocus.com> wrote:
>> From: openssl-users [mailto:openssl-users-bounces at openssl.org] On Behalf
>> Of Kim Gräsman
>> Sent: Tuesday, October 18, 2016 04:14
>>
>> Everything seems to work pretty well, but one thing is worrying -- the
>> opensslconf.h header comes out different between the two builds.
>>
>> I'm assuming this only affects implementation details in OpenSSL and
>> not the public API? I don't have to publish and maintain
>> architecture-specific headers, do I?
>
> opensslconf.h is generated from the configuration settings and platform characteristics, and applications must be compiled using the opensslconf.h that corresponds to the build they link to (or one that's equivalent).
>
> Sometimes you can get away with using the wrong opensslconf.h, but this can cause hard-to-find errors. One project I know of went for several years using the wrong opensslconf.h, and it was only discovered when a different project used some other OpenSSL features and got incorrect results on some platforms.
>
> So, in short: You do in fact have to publish and maintain one architecture-specific header.

Thanks, I was afraid so. We're compiling for 6 different targets, so
this will turn into an exciting problem :-)

I'll try to think up a way forward with this.

Any chance that OpenSSL 1.1 is different in this regard?

Thank you,
- Kim