[Git][ghc/ghc][master] Add clarification regarding poll/kqueue flags

[Marge Bot]

 Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC


Commits:
c5413fc6 by Wander Hillen at 2020-09-07T09:33:54-04:00
Add clarification regarding poll/kqueue flags

- - - - -


1 changed file:

- libraries/base/configure.ac


Changes:

=====================================
libraries/base/configure.ac
=====================================
@@ -47,9 +47,13 @@ AC_CHECK_FUNCS([clock_gettime])
 AC_CHECK_FUNCS([getclock getrusage times])
 AC_CHECK_FUNCS([_chsize ftruncate])
 
-AC_CHECK_FUNCS([epoll_ctl eventfd kevent kevent64 kqueue poll])
-
 # event-related fun
+# The line below already defines HAVE_KQUEUE and HAVE_POLL, so technically some of the
+# subsequent portions that redefine them could be skipped. However, we keep those portions
+# to keep kqueue/poll in line with HAVE_EPOLL and possible other additions in the future. You
+# should be aware of this peculiarity if you try to simulate not having kqueue or poll by
+# moving away header files (see also https://gitlab.haskell.org/ghc/ghc/-/issues/9283)
+AC_CHECK_FUNCS([epoll_ctl eventfd kevent kevent64 kqueue poll])
 
 if test "$ac_cv_header_sys_epoll_h" = yes && test "$ac_cv_func_epoll_ctl" = yes; then
   AC_DEFINE([HAVE_EPOLL], [1], [Define if you have epoll support.])



View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c5413fc62342f05d48e62f92c81a7f8a3259d3d7

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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c5413fc62342f05d48e62f92c81a7f8a3259d3d7
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