[gnio] Add OS detection

[Alexander Larsson <alexl src gnome org>]

commit b4f3e234c9948d8a341ca45ca836d3b78584a45a
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Apr 29 13:43:29 2009 +0200

    Add OS detection
---
 configure.ac |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 714de6d..9e084f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -88,6 +88,37 @@ AC_ARG_ENABLE(gir-vapi,
               ])
 AM_CONDITIONAL(ENABLE_GIR_VAPI, test "$enable_gir_vapi" = "yes")
 
+AC_MSG_CHECKING([for native Win32])
+LIB_EXE_MACHINE_FLAG=X86
+case "$host" in
+  *-*-mingw*)
+    os_win32=yes
+    gio_can_sniff=no
+    MATH_LIB=
+    case "$host" in
+    x86_64-*-*)
+      LIB_EXE_MACHINE_FLAG=X64
+      ;;
+    esac
+    ;;
+  *)
+    os_win32=no
+    ;;
+esac
+AC_MSG_RESULT([$os_win32])
+
+AC_SUBST(LIB_EXE_MACHINE_FLAG)
+
+case $host in
+  *-*-linux*)
+    os_linux=yes
+    ;;
+esac
+
+AM_CONDITIONAL(OS_WIN32, test "$os_win32" = "yes")
+AM_CONDITIONAL(OS_UNIX, test "$os_win32" != "yes")
+AM_CONDITIONAL(OS_LINUX, test "$os_linux" = "yes")
+
 AC_OUTPUT([
   docs/reference/gio/Makefile
   docs/reference/Makefile