Hi,
The bottom line is there is no clean way of supporting C++11 on 10.8 or
older. Its can only be done on a best try basis.
Using gcc is a bad idea, this can lead to C++ runtime issues.
In the root6 port we use
# Force a compatible compiler
compiler.blacklist-append *gcc* {clang < 500} macports-clang-2.9
macports-clang-3.0 macports-clang-3.1 macports-clang-3.2
compiler.fallback-append macports-clang-3.4 macports-clang-3.5
Which means newer systems use the compatible system clang compiler, and
older system use the macports clang compiler. I think this is the 'best
effort' solution. It doesn't work on OSX10.6 though, there we simply
given up support, as least with the root6 port.
Chris
On 19/03/15 16:04, Michael Dickens wrote:
I have a few ports that have recently moved to requiring c++11 (or,
maybe, c++0x), and a few to-be-submitted ports that do too, so I'm
wondering if there's a standard way to specify this requirement -- for
example, something like:
{{{
PortGroup compilers 1.0
compilers.setup require_cxx11
}}}
and, then port "does the right thing" by selecting the compiler and
cxxflags no matter the OS.
I did a quick search through the dports tree, and couldn't come up with
a single standard way to do this. The closest I found was something
like:
{{{
PortGroup compiler_blacklist_versions 1.0
compiler.blacklist-append *gcc-4.0 *gcc-4.2 {clang < 300}
}}}
but, the above does not work on my 10.8 install.
From what I can gather via testing on my 10.8 install, the clang ports
support "-std=c++11" only when "-stdlib=libc++" -- which is not the
default in MacPorts for 10.8 and prior. I haven't tried moving my ports
install to using libc++, instead leaving it with the default. Hence, it
looks like I'm stuck using GCC.
GCC 4.7+ do provide full support for "-std=c++11", and it looks like GCC
4.[56] provide support for "-std=c++0x" (but, that's old enough now that
I think I can just limit support to actual c++11).
Anyway, wondering how others have provided c++11 support to the variety
of OSs MacPorts supports. Thanks! - MLD
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