Ryan Scott authored
Summary: In ffc23270, an attempt was made at adding a Haskell wrapper around the C `timer_t` type. Unfortunately, GHC's autoconf macros weren't sophisticated enough at the time to properly detect that `timer_t` is represented by a `void *` (i.e., a pointer) on most OSes. This is a second attempt at `CTimer`, this time using `AC_COMPILE_IFELSE` to detect if a type is a pointer type by compiling the following program: ``` type val; *val; ``` This also only derives a small subset of class instances for `CTimer` that are known to be compatible with `Ptr` using a new `OPAQUE_TYPE_WITH_CTYPE` macro. Test Plan: ./validate Reviewers: erikd, hvr, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2952 GHC Trac Issues: #12795, #12998db91d17e
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