New autoconf macro "BOINC_CHECK_CYGWIN" to give people who need to modify

their configure script to work with CYGWIN a place to do their work.  Right
now the only thing done here is to check whether to use the Windows GUI or
X11.  Graphical compiles of BOINC under CYGWIN currently do not function
due to both __unix__ and _WIN32 being defined.

svn path=/trunk/boinc/; revision=9053

m4/boinc_check_cygwin.m4

@@ -0,0 +1,31 @@
+AC_DEFUN([BOINC_CHECK_CYGWIN],[
+  AC_MSG_CHECKING([whether we are compiling for cygwin])
+  case "$target" in 
+    *cygwin*)  
+        with_cygwin=yes
+	;;
+    *)  with_cygwin=no
+        ;;
+  esac
+  AC_MSG_RESULT($with_cygwin)
+  if test "${with_cygwin}" = "yes" ; then
+    AC_MSG_CHECKING([whether to use X11 or WIN32 GUI])
+    if test "${with_x+set}" = set; then
+       with_x="${with_x}"
+    else
+       with_x="no"
+    fi
+    if test "${with_x}" = "no" ; then
+      AC_MSG_RESULT(WIN32)
+      ac_cv_header_windows_h=yes
+      AC_DEFINE(XMD_H,[1],[Define to prevent redefinition of INT32 in jconfig.h])
+      AC_DEFINE(CYGWIN_USE_WIN32,[1],[Define to 1 if CYGWIN should use the WIN32 GUI])
+      LIBS="-L/usr/lib/w32api ${LIBS}" 
+      CFLAGS="-I/usr/include/w32api -D_WIN32 -DWIN32 ${CFLAGS}"
+      CXXFLAGS="-I/usr/include/w32api  -D_WIN32 -DWIN32 ${CXXFLAGS}"
+      CPPFLAGS="-I/usr/include/w32api  -D_WIN32 -DWIN32 ${CPPFLAGS}"
+    else
+      AC_MSG_RESULT(X11)
+    fi
+  fi
+])