merged branches/trac148b: added -R<dir_to_libpython> when possible. it help build on netbsd.

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@2427 e5f2f494-b856-4b98-b285-d166d9295462

configure.ac

@@ -18,6 +18,20 @@ AC_LANG([C++])
 AM_CONDITIONAL(USE_GXX, test "X${GXX}" = "Xyes")
 AC_CHECK_DECL([__SUNPRO_CC], [SUNCXX="yes"], [SUNCXX="no"])
 
+# Linker options
+
+# check -R rather than gcc specific -rpath to be as portable as possible.
+AC_MSG_CHECKING([whether -R flag is available in linker])
+LDFLAGS_SAVED="$LDFLAGS"
+LDFLAGS="$LDFLAGS -R/usr/lib"
+AC_TRY_LINK([],[],
+	[ AC_MSG_RESULT(yes)
+		rpath_available=yes
+	],[ AC_MSG_RESULT(no)
+	rpath_available=no
+	])
+LDFLAGS=$LDFLAGS_SAVED
+
 # OS dependent compiler flags
 case "$host" in
 *-solaris*)
@@ -83,6 +97,20 @@ else
 		AC_MSG_WARN([${PYTHON}-config does not exist or is not executable, so we could not detect python development environment.  Your system may require an additional package (e.g. "python3-dev").  Alternatively, if you are sure you have python headers and libraries, define PYTHON_INCLUDES and PYTHON_LDFLAGS and run this script.])
 	fi
 fi
+
+# Some OSes including NetBSD don't install libpython.so in a well known path.
+# To avoid requiring dynamic library path with our python wrapper loadable
+# modules, we embed the path to the modules when possible.  We do this even
+# when the path is known in the common operational environment (e.g. when
+# it's stored in a common "hint" file) for simplicity.
+if test $rpath_available = yes; then
+	python_rpath=
+	for flag in ${PYTHON_LDFLAGS}; do
+		python_rpath="${python_rpath} `echo $flag | sed -ne 's/^\(\-L\)/-R/p'`"
+	done
+	PYTHON_LDFLAGS="${PYTHON_LDFLAGS} ${python_rpath}"
+fi
+
 AC_SUBST(PYTHON_INCLUDES)
 AC_SUBST(PYTHON_LDFLAGS)
 
@@ -91,7 +119,6 @@ CPPFLAGS="$CPPFLAGS ${PYTHON_INCLUDES}"
 AC_CHECK_HEADERS([Python.h],, AC_MSG_ERROR([Missing Python.h]))
 CPPFLAGS="$CPPFLAGS_SAVED"
 
-
 # Check for python library.  Needed for Python-wrapper libraries.
 LDFLAGS_SAVED="$LDFLAGS"
 LDFLAGS="$LDFLAGS $PYTHON_LDFLAGS"
@@ -101,6 +128,7 @@ if test $python_lib != "no"; then
 	PYTHON_LIB="-l$python_lib"
 fi
 AC_SUBST(PYTHON_LIB)
+LDFLAGS=$LDFLAGS_SAVED
 
 # TODO: check for _sqlite3.py module
 
@@ -142,6 +170,7 @@ namespace isc {class Bar {Foo foo_;};} ],,
 	 B10_CXXFLAGS="$B10_CXXFLAGS -Werror"],
 	[AC_MSG_RESULT(yes)])
 CXXFLAGS="$CXXFLAGS_SAVED"
+
 fi				dnl GXX = yes
 
 AM_CONDITIONAL(GCC_WERROR_OK, test $werror_ok = 1)
@@ -484,7 +513,10 @@ Flags:
   CXXFLAGS:      $CXXFLAGS
   B10_CXXFLAGS:  $B10_CXXFLAGS
 dnl includes too
-  SQLite:	 $SQLITE_CFLAGS
+  Python:        ${PYTHON_INCLUDES}
+                 ${PYTHON_LDFLAGS}
+                 ${PYTHON_LIB}
+  SQLite:        $SQLITE_CFLAGS
                  $SQLITE_LIBS
 
 Features: