Commits on May 7, 2017

1. Add bindgen feature …

   This swaps out compilation with `fitsio-sys` for compilation with
   `fitsio-sys-bindgen`. This relies on the user having clang>=3.9
   installed on their system.
   
   Set up compilation for switching features (build error)
   
   Ensure code compiles and tests pass
   
   This mostly revolved around changing pointer types which were hard coded
   to cast to libc::c_void, whereas in `fitsio-sys-bindgen` they were
   `std::os::raw::c_void`. By using a wildcard cast (`_`) the code
   automatically casts to the correct value for both libraries.
   
   The other change was to move `MAX_VALUE_LENGTH` to `fitsio` rather than
   the low level library.

   

   simonrw committed May 7, 2017
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2. Update readme with bindgen feature

   

   simonrw committed May 7, 2017
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   b1bcc17 View commit details

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