git: Prevent implicit -std=* passing from NXCFLAGS to NXCXXFLAGS.

[Rimvydas Jasinskas]

commit 259eb49bd722586904361b7652b5ad96ede682b5
Author: zrj <rimvydas.jasinskas at gmail.com>
Date:   Wed Feb 8 18:40:21 2017 +0200

    Prevent implicit -std=* passing from NXCFLAGS to NXCXXFLAGS.
    
    C and c++ standards are not cross compatible, this is a major issue with clang
    import into the base that explictly requires at least the -std=c++11 standard.
    It gets complicated because even tablegen utilities used as buildtools depend
    explictly on c++11. This implies that we no longer can avoid libstdc++ usage
    in hostlib/hostprog infrastructure.
    
    While there, explcitly filter out -flto options from host native tools FLAGS
    and add a missing rule to allow generating host native c++ utilities for the
    use in buildworld.

Summary of changes:
 share/mk/sys.mk | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/259eb49bd722586904361b7652b5ad96ede682b5


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