Date: Wed, 23 Sep 2020 12:16:36 -0400 From: Jeffrey Walton <noloader@...il.com> To: musl@...ts.openwall.com Subject: Re: Re: OS detection wrong on Alpine Linux 3.10 On Wed, Sep 23, 2020 at 12:08 PM Rich Felker <dalias@...c.org> wrote: > > On Wed, Sep 23, 2020 at 09:13:16AM -0400, James Y Knight wrote: > > > > > > >All I need to know is what version of Musl I am dealing with and I can > > > >configure myself. > > > > > > Are you willing to maintain an #ifdef forest for all the versions of > > > all the libcs and all the kernels your programs may be used with, so > > > you can list exhaustively the available features in every configuration? > > > > At the risk of jumping in on a question asked of someone else: yes, > > absolutely! (Not _all_ available features of course, just the ones > > required.) > > > > There are generally not that many nonstandard features you'd want to use in > > a typical program, and using an ifdef forest to implement an abstraction > > layer around those couple items is just fine. > > I can't know whether you're "willing", but you're definitely not > willing and able. "All the..." includes people's personal projects > (from scratch or patches to existing ones) that you will never see, > future systems that come into existence long past your involvement in > the project or even your lifetime, etc. Unless something has changed recently, Botan, Crypto++ and OpenSSL are still being carried by most Linux distributions. OpenSSL is also regularly distributed as part of other OSes, like AIX, Android, BSDs, iOS, OS X and Solaris. And unlike some other projects, Botan, Crypto++ and OpenSSL actually work in practice on all the platforms without a configuration program that performs feature tests.  the Rust compiler comes to mind here. It works on Linux x86_64, but it's hit or miss whether it works or not on other architectures like ARMv7, Aarch64 and PowerPC, even after an approved configuration program is run. Jeff
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