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Problem with sys_select on Cygwin


From: Ken Brown
Subject: Problem with sys_select on Cygwin
Date: Sat, 19 Mar 2016 14:01:59 -0400
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0

Cygwin is changing its headers as of the next release so that sys/types.h includes sys/select.h. This is incompatible with Gnulib's sys_select module. If a Gnulib module includes sys/types.h, this brings in Gnulib's sys/select.h, which includes signal.h and other system headers. Since the inclusion of sys/types.h hasn't finished yet, this results in many errors.

For example, here's what happens when I try to build emacs with the new Cygwin headers in place:

In file included from /usr/include/sys/signal.h:112:0,
                 from /usr/include/signal.h:6,
                 from ./signal.h:52,
                 from ./sys/select.h:108,
                 from /usr/include/sys/time.h:47,
                 from ./sys/time.h:39,
                 from ./sys/select.h:87,
                 from /usr/include/sys/types.h:88,
                 from ./sys/types.h:28,
                 from ../../master/lib/acl.h:24,
                 from ../../master/lib/acl-errno-valid.c:22:
/usr/include/cygwin/signal.h:178:3: error: unknown type name ‘pthread_attr_t’

[...]

In file included from ./sys/time.h:39:0,
                 from ./sys/select.h:87,
                 from /usr/include/sys/types.h:88,
                 from ./sys/types.h:28,
                 from ../../master/lib/acl.h:24,
                 from ../../master/lib/acl-errno-valid.c:22:
/usr/include/sys/time.h:104:34: error: unknown type name ‘u_int’
 bintime_mul(struct bintime *_bt, u_int _x)

[...]

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 problem?

Thanks.

Ken



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