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Re: Problem with sys_select on Cygwin

From: Ken Brown
Subject: Re: Problem with sys_select on Cygwin
Date: Sun, 20 Mar 2016 07:14:09 -0400
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0

On 3/19/2016 10:44 PM, Paul Eggert wrote:
Ken Brown wrote:
Cygwin is changing its headers as of the next release so that sys/types.h
includes sys/select.h....
Can sys_select be changed so that it doesn't try to include other
headers before
it has finished including sys/types.h?  Or is there some other way to
solve this

Probably the latter. Why is Cygwin changing its headers? What is it
changing? This may help us to provide a special case in Gnulib to solve
the problem.  For example, we might be able to add Cygwin to the
existing mess of code near the start of lib/sys_select.in.h that does
something special for __osf__ and/or for __sun.

Eric can probably explain this better than I can, but I'll give it a try. Newlib, which provides Cygwin's libc, has just had a complete overhaul of its feature test macros, with the goal of increasing compatibility with Glibc and/or BSD. The relevant change to sys/types.h is simply

--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -87,5 +87,7 @@
 # if   __BSD_VISIBLE

+#include <sys/select.h>
 #  define      physadr         physadr_t
 #  define      quad            quad_t

I gather that __BSD_VISIBLE is similar to Glibc's __USE_MISC, which Glibc uses to guard the inclusion of sys/select.h.


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