Added some documentation on how to use with various buildsystems. #229 (

#300)

src/site/markdown/1-usage.md

@@ -38,3 +38,4 @@ See the following pages for usage information:
 * @subpage performance
 * @subpage conclusions
 * @subpage faq
+* @subpage buildsystems

src/site/markdown/buildsystems.md

@@ -0,0 +1,79 @@
+Usage with your build system {#buildsystems}
+===
+<!--
+ Note: License header cannot be first, as doxygen does not generate
+ cleanly if it before the '==='
+-->
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements.  See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License.  You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+[TOC]
+
+The following code snippets show how to use Log4cxx with various different buildsystems.
+
+Note that we are unable to provide support for all buildsystems that you may be using.
+
+CMake is fully supported for building, as well as any buildsystem that can use `pkgconfig`
+in order to find packages.  When using `pkgconfig`, the package name is `liblog4cxx`.
+
+# How do I use Log4cxx with CMake? {#use_with_cmake}
+
+Add the following to your CMakeLists.txt file:
+
+~~~
+find_package(log4cxx)
+
+... other buildsystem information here ...
+
+target_link_libraries( executable PRIVATE log4cxx )
+~~~
+
+# How do I use Log4cxx with CMake and pkg-config? {#use_with_cmake_pkgconfig}
+
+Add the following to your CMakeLists.txt file:
+
+~~~
+find_package(PkgConfig)
+pkg_check_modules(log4cxx REQUIRED liblog4cxx)
+
+... other buildsystem information here ...
+
+target_link_libraries( executable PRIVATE ${log4cxx_LIBRARIES} )
+target_include_directories( executable PRIVATE ${log4cxx_INCLUDE_DIRS} )
+~~~
+
+
+# How do I use Log4cxx with QMake? {#use_with_qmake}
+
+Add the following to your .pro file:
+
+~~~
+CONFIG += link_pkgconfig
+
+PKGCONFIG += liblog4cxx
+~~~
+
+# How do I use Log4cxx with plain Make? {#use_with_make}
+
+You probably don't want to do this - it is highly recommended to use a proper buildsystem.  However, the following minimal Makefile will build and link an application:
+
+~~~
+CXXFLAGS += $(shell pkg-config --cflags liblog4cxx)
+LDFLAGS += $(shell pkg-config --libs liblog4cxx)
+
+all: main.o
+        $(CXX) -o application main.o $(LDFLAGS)
+~~~