New Recipe: FireFly v2.0.3

[Fenyutanchan]

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[Fenyutanchan]

Hello, @giordano.
Could you help me solve these strange problems in both x86-64 and ARM MacOS?
I don't understand it well.

[giordano]

At a quick glance, I think the linker invocation is missing to link the needed libraries, hence the undefined symbols errors. Why that's happening, I don't know without having a more thorough look, which now I can't.

[Fenyutanchan]

I have disabled the CMake flags -DCUSTOM for the darwin building.
However, all other platforms got stuck with the target of "example".
I switched the GCC version to v6.1.0 for solving it.
There is then a strange segmentation fault raised during making the "x86-64-linux-gnu-cxx11", while there is no problem in my local machine.
I have no idea what happened.
@giordano, do you have any comments on it?

I refer GCC v7.1.0 finally.
Plz review it.
Thank you ~