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bug#22959: Emacs on Windows depends on libwinpthreads


From: Fabrice Popineau
Subject: bug#22959: Emacs on Windows depends on libwinpthreads
Date: Mon, 18 Apr 2016 15:41:59 +0200



2016-04-18 15:06 GMT+02:00 Phillip Lord <address@hidden>:
Eli Zaretskii <address@hidden> writes:

>> From: Fabrice Popineau <address@hidden>
>> Date: Sat, 16 Apr 2016 23:48:35 +0200
>>
>> At this point, when I build emacs for w64 using msys2,
>> emacs.exe depends on libwinpthread for only one symbol
>> which is clock_gettime().
>> This is called from lib/gettime.c:gettime().
>
> This is not supposed to happen.  I don't see this on my system.
>
> There's some factor at work here that I cannot figure out: the
> configure-time test for clock_gettime doesn't try to look for that
> function in the pthreads library, it only tries the "normal" link
> without any extra libraries, and if that fails, tries 2 extra
> libraries: librt and libposix4, none of which I'd expect to see on
> MS-Windows in a MinGW installation.


I did get the same thing at one point.


> It could be something peculiar to MinGW64/MSYS2 build.  Are you sure
> libwinpthread dependency is not a requirement of the MinGW64 GCC port?

This was the cause of the problem for me.


Add this:

diff --git a/nt/mingw-cfg.site b/nt/mingw-cfg.site
index 05034fe..0063c2b 100644
--- a/nt/mingw-cfg.site
+++ b/nt/mingw-cfg.site
@@ -40,6 +40,12 @@ gl_cv_sys_struct_timespec_in_pthread_h=no
 # Or at all...
 ac_cv_header_pthread_h=no

+# We don't want to check for these functions
+# because they are implemented in libwinpthread.
+ac_cv_search_clock_gettime="none required"
+ac_cv_func_clock_gettime=no
+ac_cv_func_clock_settime=no
+
 # ACL functions are implemented in w32.c
 ac_cv_search_acl_get_file="none required"
 ac_cv_func_acl_get_file=yes

And the dependency towards libwinpthread is gone for MinGW64.

Fabrice


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