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Subject: [Bug 211134] Mk/Uses/compiler.mk: Needs to add --std=c++11 to CXXFLAGS
Date: Fri, 15 Jul 2016 10:18:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211134

--- Comment #3 from Baptiste Daroussin <bapt@FreeBSD.org> ---
You need to say to the framework that you need either
1/ a compiler that is recent enough for c++11 via USES=3Dcompiler:c++11-lang
OR
2/ a compiler that provides the support for c++11 standard library via
USES=3Dcompiler:c++11-lib

AND (yes this is separate)

Specify which standard you are using:
USE_CXXSTD=3Dc++11


if you compiler tells you:
> cc1plus: error: unrecognized command line option "-std=3Dc++11"

That means it received CXXFLAGS as you are asking for properly. But probably
you did not tell it (or have removed when testing) the 1 or 2 leading you to
using base gcc which is 4.2 and does not support C++11 at all

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