1 files changed, 46 insertions, 0 deletions
diff --git a/m4/physmem.m4 b/m4/physmem.m4
new file mode 100644
index 0000000..aa92b25
--- /dev/null
+++ b/m4/physmem.m4
@@ -0,0 +1,46 @@
+# physmem.m4 serial 12
+dnl Copyright (C) 2002-2003, 2005-2006, 2008-2022 Free Software Foundation,
+dnl Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+# 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;
+                        if (x > 0.0) return 0;]])],
+      [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],
+[
+  # Prerequisites of lib/physmem.c.
+  AC_CHECK_HEADERS([sys/pstat.h sys/sysmp.h sys/sysinfo.h \
+    machine/hal_sysinfo.h sys/table.h sys/param.h sys/systemcfg.h],,,
+    [AC_INCLUDES_DEFAULT])
+  dnl <sys/sysctl.h> requires <sys/param.h> on OpenBSD 4.0.
+  AC_CHECK_HEADERS([sys/sysctl.h],,,
+    [AC_INCLUDES_DEFAULT
+     #if HAVE_SYS_PARAM_H
+     # include <sys/param.h>
+     #endif
+    ])
+
+  AC_CHECK_FUNCS([pstat_getstatic pstat_getdynamic sysmp getsysinfo sysctl table sysinfo])
+  AC_CHECK_MEMBERS([struct sysinfo.mem_unit],,, [[#include <sys/sysinfo.h>]])
+  AC_REQUIRE([gl_SYS__SYSTEM_CONFIGURATION])
+])