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pthread_sigmask() detected incorrectly on MinGW by configure

From: Pavel Fedin
Subject: pthread_sigmask() detected incorrectly on MinGW by configure
Date: Thu, 23 Apr 2015 10:53:59 +0300

 Hello! I have found one more problem with GNULib on Windows.

 This time it concerns pthread_sigmask(). configure script detects it as
present, and this is technically correct, but:
--- cut ---
/* Windows has rudimentary signals support.  */
#define pthread_sigmask(H, S1, S2) 0
--- cut ---

 So, this is actually incorrect. And this causes failure building gnulib's
pthread_sigmask.c, because it tries to refer original pthread_sigmask()
after #undef'ing it. Of course this causes "undefined symbol" while linking.
 I would suggest that configure script just knows that on *-mingw* systems
pthread_sigmask is not present. An alternate way to fix this is to add to
the .c file:
--- cut ---
#ifdef _WIN32
--- cut ---

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

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