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HP-UX: ensure <sys/select.h> is complete


From: Bruno Haible
Subject: HP-UX: ensure <sys/select.h> is complete
Date: Fri, 31 Dec 2010 15:50:15 +0100
User-agent: KMail/1.9.9

On HP-UX 11.11, I'm seeing these gcc warnings:

test-select-fd.c:47: warning: implicit declaration of function 'memset'
test-select-fd.c:47: warning: incompatible implicit declaration of built-in 
function 'memset'
test-select-stdin.c:44: warning: implicit declaration of function 'memset'
test-select-stdin.c:44: warning: incompatible implicit declaration of built-in 
function 'memset'
test-sys_select.c:32: warning: implicit declaration of function 'memset'
test-sys_select.c:32: warning: incompatible implicit declaration of built-in 
function 'memset'

The reason is that the system's <sys/time.h> defines FD_ZERO to a macro that
uses memset(), but does not include <string.h>. This fixes it:


2010-12-31  Bruno Haible  <address@hidden>

        sys_select: Avoid warning about missing memset declaration on HP-UX 11.
        * lib/sys_select.in.h: On HP-UX, include also <string.h>.

--- lib/sys_select.in.h.orig    Fri Dec 31 15:46:54 2010
+++ lib/sys_select.in.h Fri Dec 31 15:46:38 2010
@@ -72,6 +72,11 @@
 /* Get the 'struct timeval' and 'fd_set' types and the FD_* macros
    on most platforms.  */
 # include <sys/time.h>
+/* On HP-UX 11, <sys/time.h> provides an FD_ZERO implementation
+   that relies on memset(), but without including <string.h>.  */
+# if defined __hpux
+#  include <string.h>
+# endif
 /* On native Windows platforms:
    Get the 'fd_set' type.  Also, gnulib's <sys/socket.h> redefines select
    so as to hide the declaration from <winsock2.h>.  */



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