Fix install locations for modprobe config and udev rules (#502)

* cmake: Fix location of modprobe.d config.

* cmake: Use cmake variables for install locations.

This commit add the following two Cmake variables to
change the install location of the udev and modprobe
configuration files:
    - STLINK_UDEV_RULES_DIR
    - STLINK_MODPROBED_DIR

* doc/compiling.md: Add info about new CMAKE variables.

* debian: Use CMAKE variables for build.

CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 2.8.7)
 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")
 
 option(STLINK_GENERATE_MANPAGES "Generate manpages with pandoc" OFF)
 
@@ -131,9 +133,9 @@ install(TARGETS st-flash st-info
 if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
 	file(GLOB RULES_FILES etc/udev/rules.d/*.rules)
 	install(FILES etc/modprobe.d/stlink_v1.conf
-	DESTINATION /etc)
+	DESTINATION ${STLINK_MODPROBED_DIR}/)
 	install(FILES ${RULES_FILES}
-	DESTINATION /lib/udev/rules.d/)
+	DESTINATION ${STLINK_UDEV_RULES_DIR}/)
 endif()
 
 add_subdirectory(src/gdbserver)

debian/rules

@@ -24,4 +24,5 @@ include /usr/share/dpkg/default.mk
 # This is example for Cmake (See http://bugs.debian.org/641051 )
 override_dh_auto_configure:
 	dh_auto_configure -- \
-    -DCMAKE_LIBRARY_PATH=$(DEB_HOST_MULTIARCH)
+    -DCMAKE_LIBRARY_PATH=$(DEB_HOST_MULTIARCH) \
+    -DSTLINK_UDEV_RULES_DIR='/lib/udev/rules.d'

doc/compiling.md

@@ -79,3 +79,13 @@ brew install libusb cmake
 ```
 
 Compile as described in the first section of this document.
+
+## Build using different directories for udev and modprobe
+
+To put the udev or the modprobe configuration files into a different directory
+during installation you can use the following cmake options:
+
+```
+$ cmake -DSTLINK_UDEV_RULES_DIR="/usr/lib/udev/rules.d" \
+        -DSTLINK_MODPROBED_DIR="/usr/lib/modprobe.d" ..
+```