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Date:      Fri, 07 Oct 2016 11:21:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ports-bugs@FreeBSD.org
Subject:   [Bug 211808] graphics/opencv-core: c++ compiler error due to "fatal error: 'stddef.h' file not found"
Message-ID:  <bug-211808-13-W6PANif5VG@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-211808-13@https.bugs.freebsd.org/bugzilla/>
References:  <bug-211808-13@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211808

--- Comment #7 from Jan Beich (mail not working) <jbeich@FreeBSD.org> ---
(In reply to ohartman from comment #6)
> Until now, I lived under the impression, "native" would force
> the compiler to select the proper feature list due to CPUID.

Correct. Compiler but not ports e.g.,

  # excerpt from math/fftw3
  .  if !empty(MACHINE_CPU:Mavx)
  CONFIGURE_ARGS+=3D--enable-avx
  .  endif

> But since even the host failing the build does build the ports
> properly in poudriere, doesn't reveal much I guess.

By homework I've meant replicating live system environment bit-by-bit until=
 it
can be reproduced within poudriere. This is a very tedious process but allo=
ws
to track down practically any bug except those affecting kernel or hardware.

Another name to call it is bisecting environment.

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