[Bug-gnulib] physmem.m4 support for ports to various hosts

[Paul Eggert]

I installed this patch, taken from coreutils with modifications.
This patch is a necessary companion to
<http://mail.gnu.org/archive/html/bug-gnulib/2003-08/msg00102.html>;
I should have made it one patch, but didn't notice the discrepancy
until just now.

2003-08-16  Jim Meyering  <address@hidden>
        and Paul Eggert  <address@hidden>

        * physmem.m4 (gl_SYS__SYSTEM_CONFIGURATION): New macro.
        (gl_PHYSMEM): Use it.  
        Also check for `table' function.
        Check for new headers and functions.
        Add check for sys/sysmp.h.
        With suggestions from Kaveh Ghazi.
        Ignore headers that are present but cannot be compiled.  This
        avoids spurious warnings on Solaris 9 sparc with Forte Developer 7
        C 5.4.
        
Index: physmem.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/physmem.m4,v
retrieving revision 1.1
retrieving revision 1.2
diff -p -u -r1.1 -r1.2
--- physmem.m4  31 Dec 2002 13:42:07 -0000      1.1
+++ physmem.m4  16 Aug 2003 09:25:58 -0000      1.2
@@ -1,15 +1,39 @@
-# physmem.m4 serial 1
-dnl Copyright (C) 2002 Free Software Foundation, Inc.
+# physmem.m4 serial 2
+dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc.
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
 dnl Public License, this file may be distributed as part of a program
 dnl that contains a configuration script generated by Autoconf, under
 dnl the same distribution terms as the rest of that program.
 
+# Check for the external symbol, _system_configuration,
+# a struct with member `physmem'.
+AC_DEFUN([gl_SYS__SYSTEM_CONFIGURATION],
+  [AC_CACHE_CHECK(for external symbol _system_configuration,
+                 gl_cv_var__system_configuration,
+    [AC_LINK_IFELSE([AC_LANG_PROGRAM(
+                     [[#include <sys/systemcfg.h>
+                     ]],
+                     [double x = _system_configuration.physmem;])],
+      [gl_cv_var__system_configuration=yes],
+      [gl_cv_var__system_configuration=no])])
+
+    if test $gl_cv_var__system_configuration = yes; then
+      AC_DEFINE(HAVE__SYSTEM_CONFIGURATION, 1,
+               [Define to 1 if you have the external variable,
+               _system_configuration with a member named physmem.])
+    fi
+  ]
+)
+
 AC_DEFUN([gl_PHYSMEM],
 [
-  dnl Prerequisites of lib/physmem.c.
+  # Prerequisites of lib/physmem.c.
   AC_CHECK_HEADERS_ONCE(unistd.h)
-  AC_CHECK_HEADERS(sys/pstat.h)
-  AC_CHECK_FUNCS(pstat_getstatic pstat_getdynamic)
+  AC_CHECK_HEADERS([sys/pstat.h sys/sysmp.h sys/sysinfo.h \
+    machine/hal_sysinfo.h sys/table.h sys/param.h sys/sysctl.h \
+    sys/systemcfg.h],,, [AC_INCLUDES_DEFAULT])
+
+  AC_CHECK_FUNCS(pstat_getstatic pstat_getdynamic sysmp getsysinfo sysctl 
table)
+  AC_REQUIRE([gl_SYS__SYSTEM_CONFIGURATION])
 ])