Add support for Interix.

This commit was SVN r17983.

acinclude.m4

@@ -108,6 +108,7 @@ m4_include(config/ompi_lang_link_with_c.m4)
 # Include the macros for Windows checking
 #
 m4_include(config/ompi_microsoft.m4)
+m4_include(config/ompi_interix.m4)
 
 #
 # The config/mca_no_configure_components.m4 file is generated by

config/ompi_interix.m4

@@ -0,0 +1,56 @@
+dnl -*- shell-script -*-
+dnl
+dnl Copyright (c)      2008 The University of Tennessee and The University
+dnl                         of Tennessee Research Foundation.  All rights
+dnl                         reserved.
+dnl $COPYRIGHT$
+dnl 
+dnl Additional copyrights may follow
+dnl 
+dnl $HEADER$
+dnl
+
+######################################################################
+#
+# OMPI_INTERIX
+#
+# Detect if the environment is SUA/SFU (i.e. Interix) and modify
+# the compiling environment accordingly.
+#
+# USAGE:
+#   OMPI_INTERIX()
+#
+######################################################################
+AC_DEFUN([OMPI_INTERIX],[
+
+    AC_MSG_CHECKING(for Interix environment)
+    AC_TRY_COMPILE([],
+                   [#if !defined(__INTERIX)
+                    #error Normal Unix environment
+                    #endif],
+                   is_interix=yes,
+                   is_interix=no)
+    AC_MSG_RESULT([$is_interix])
+    if test "$is_interix" = "yes"; then
+
+        ompi_show_subtitle "Interix detection"
+
+        if ! test -d /usr/include/port; then
+            AC_MSG_WARN([Compiling Open MPI under Interix require an up-to-date])
+            AC_MSG_WARN([version of libport. Please ask your system administrator])
+            AC_MSG_WARN([to install it (pkg_update -L libport).])
+            AC_MSG_ERROR([*** Cannot continue])
+        fi
+        #
+        # These are the minimum requirements for Interix ...
+        #
+        AC_MSG_WARN([    -lport was added to the linking flags])
+        LDFLAGS="-lport $LDFLAGS"
+        AC_MSG_WARN([    -D_ALL_SOURCE -D_USE_LIBPORT was added to the compilation flags])
+        CFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CFLAGS"
+        CPPFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CPPFLAGS"
+        CXXFLAGS="-D_ALL_SOURCE -D_USE_LIBPORT -I/usr/include/port $CXXFLAGS"
+
+    fi
+
+])

configure.ac

@@ -192,6 +192,9 @@ OMPI_SETUP_CC
 AM_CONDITIONAL(OMPI_NEED_WINDOWS_REPLACEMENTS,
                test "$ompi_cv_c_compiler_vendor" = "microsoft" )
 
+# Do all Interix detections if necessary
+OMPI_INTERIX
+
 # Does the compiler support "ident"-like constructs?
 
 OMPI_CHECK_IDENT([CC], [CFLAGS], [c], [C])