Added LIB_INSTALL_DIR to correct libs install on 64-bit systems (#636)

* Added LIB_INSTALL_DIR to correct libs install on 64-bit systems
* Add description for using LIB_INSTALL_DIR parameter.

CMakeLists.txt

@@ -4,7 +4,8 @@ project(stlink C)
 set(PROJECT_DESCRIPTION "Open source version of the STMicroelectronics Stlink Tools")
 set(STLINK_UDEV_RULES_DIR "/etc/udev/rules.d" CACHE PATH "Udev rules directory")
 set(STLINK_MODPROBED_DIR "/etc/modprobe.d" CACHE PATH "modprobe.d directory")
-set(STLINK_LIBRARY_PATH "lib/${CMAKE_LIBRARY_PATH}" CACHE PATH "Target lib directory")
+set(LIB_INSTALL_DIR "lib" CACHE PATH "Main library directory")
+set(STLINK_LIBRARY_PATH "${LIB_INSTALL_DIR}/${CMAKE_LIBRARY_PATH}" CACHE PATH "Target lib directory")
 
 option(STLINK_GENERATE_MANPAGES "Generate manpages with pandoc" OFF)
 

doc/compiling.md

@@ -118,6 +118,15 @@ $ cmake -DSTLINK_UDEV_RULES_DIR="/usr/lib/udev/rules.d" \
         -DSTLINK_MODPROBED_DIR="/usr/lib/modprobe.d" ..
 ```
 
+## Build using different directory for shared libs
+
+To put the compiled shared libs into a different directory during installation
+you can use the following cmake option:
+
+```
+$ cmake -DLIB_INSTALL_DIR:PATH="/usr/lib64"  ..
+```
+
 ## Windows (MinGW64) 
 
 ### Prequistes