Yes, the examples in the book are missing some lines. I think the following
log shows what they were going for:
joy.udp=> (remove-method compiler ::osx)
joy.udp=> (def unix (into unix {::c-compiler "/usr/bin/gcc"}))
joy.udp=> (def osx (into osx {:c-compiler "gcc"}))
oy.udp=> osx
{:home "/Users", :llvm-compiler "clang", :os :joy.udp/osx,
:joy.udp/prototype {:home "/home", :os :joy.udp/unix, :c-compiler "cc",
:dev "/dev"}, :c-compiler "gcc"}
joy.udp=> unix
{:home "/home", :joy.udp/c-compiler "/usr/bin/gcc", :os :joy.udp/unix,
:c-compiler "cc", :dev "/dev"}
joy.udp=> (compiler osx)
"gcc"
joy.udp=> (compile-cmd osx)
"/usr/bin/gcc"
About your question:
> Isn't there a core function/macro where I can derive and set hierarchy all
> at once?
>
Such a function would need to know in advance what hierarchy you want to
construct. If you have a desired pattern of hierarchy that you want to
reuse, you could define a function to create it using "derive" and
optionally "make-hierarchy".
On Monday, May 19, 2014 4:38:00 PM UTC-7, gamma235 wrote:
>
> I actually just wanna know why I need to use derive so many times. Isn't
> there a core function/macro where I can derive and set hierarchy all at
> once? I'm just looking for a more efficient way. My bad for not stating
> that more clearly in the original post.
>
> The real problem though is the last two calls to compile-cmd. I've been
> messing with it for a couple of days so any help there would be well
> appreciated.
>
> Thanks
>
> J
>
>
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