Re: FreeBSD 10, clang, and openmp

[Aleksej Saushev <asau%inbox.ru@localhost>]

Jonathan Perkin <jperkin%joyent.com@localhost> writes:

> * On 2014-07-16 at 20:57 BST, Jason Bacon wrote:
>
>> On 07/16/14 14:31, Jonathan Perkin wrote:
>> >* On 2014-07-16 at 20:11 BST, Jason Bacon wrote:
>> >
>> >>Is there an "official" way to force pkgsrc to use GCC on FreeBSD 10?  (
>> >>Assuming the pkgsrc gcc packages work on FreeBSD, which I'm trying right
>> >>now. )
>> >>
>> >>I'm going to be converting a lot of FreeBSD ports to pkgsrc in the near
>> >>future and the process is much more efficient if I can use FreeBSD to get
>> >>the pkg to a working state before testing on other platforms.
>> >>
>> >>I've run into problems with software that requires openmp, because it's
>> >>disabled in FreeBSD's clang base compiler.  In the FreeBSD port, I can
>> >>indicate the need for GCC instead of clang with
>> >>
>> >>     USE_GCC=any
>> >>
>> >>In pkgsrc, I've tried things like
>> >>
>> >>     GCC_REQD=4.5
>> >>
>> >>which has no effect - pkgsrc still uses clang and clang++.
>> >PKGSRC_COMPILER is the user variable which tells pkgsrc which compiler
>> >you are using.  GCC_REQD is only valid if you have already set this to
>> >'gcc'.  You'd normally set PKGSRC_COMPILER at bootstrap time using the
>> >--compiler flag.
>> >
>> >If a package specifically requires clang, then in the package Makefile
>> >you can set PKGSRC_COMPILER+= clang, and then ONLY_FOR_COMPILER=clang.
>> >
>> >Hope that helps,
>> >
>> Thanks - that is informative.
>> 
>> It sounds like I would need to bootstrap the whole pkgsrc installation using
>> GCC to make this work, which would probably not be difficult using FreeBSD's
>> GCC port (/usr/local/bin/gcc47, for example).
>> 
>> What I was hoping to do, though, was bootstrap from the FreeBSD base clang
>> and trigger installation of a pkgsrc gcc package as a dependency if needed.
>> 
>> This is what FreeBSD's USE_GCC will do if clang is the base compiler
>> (FreeBSD 10.0 and later).  FTR, USE_GCC=any allows the use of the base gcc
>> compiler in FreeBSD systems prior to 10.0, while USE_GCC=yes forces
>> installation of a gcc port on any FreeBSD release, regardless of whether the
>> base compiler is gcc or clang.
>
> Right, that is what my second paragraph would achieve, though you
> would need to ensure that anywhere you add this is done with something
> like:
>
>   .include "../../mk/bsd.prefs.mk"
>   .if ${OPSYS} == "FreeBSD"
>   PKGSRC_COMPILER+= gcc
>   NOT_FOR_COMPILER= clang
>   .endif
>
> so as to not break other operating systems which ship with a working
> clang.

Since the question is about OpenMP "working clang" is an oxymoron rather.

Our compiler selection framework is severely broken.
In significant part the breakage is due to libtool usage.


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