In this case, I think the git repo
<https://github.com/joyofclojure/book-source/blob/b76ef15248dac88c7b1c77c2d461f3aa522a1461/src/clj/joy/multimethods.clj#L82>
has correct code where the book does not; "clang" instead of "gcc":
(defmethod compile-cmd [::osx "gcc"] [m]
(str "/usr/bin/" (get m :c-compiler)))
...should instead be...
(defmethod compile-cmd [::osx "clang"] [m] ;; Match the vector exactly
(str "/usr/bin/" (get m :c-compiler)))
On Tuesday, May 20, 2014 at 11:06:09 PM UTC-4 JD wrote:
> This did it Greg,
>
> Thanks a lot.
>
>
> On Wednesday, May 21, 2014 2:18:08 AM UTC+9, Greg D wrote:
>>
>> 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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