Document libtool versioning process

RELEASE_PROCESS.md

@@ -1,25 +1,45 @@
 # USBGuard Release Process
 
-1. Clean up any artifact from your local repository.
+1. Clean up any artifacts from your local repository.
 
 ```
-$ git clean -x -f -d
+$ git clean -xfd
 ```
 
-2. Run the test suite. All the tests must pass.
+2. Setup build directory.
 
 ```
 $ ./autogen.sh
-$ mkdir build; cd build
+$ mkdir build && cd build
 $ ../configure --enable-full-test-suite --with-crypto-library=gcrypt --with-ldap
 $ make
+```
+
+3. Run the test suite. All the tests must pass.
+
+```
 $ sudo make check
-$ cd ..; rm -rf build
 ```
 
-3. Update the `VERSION` file and `CHANGELOG.md`. Commit your changes.
+4. Compare previous lib version with current.
+
+```
+$ abidiff --stat ../abi-ref/libusbguard.so.abi .libs/libusbguard.so
+$ cd ..
+```
+
+5. Update the lib version (CURRENT, REVISION, AGE) in `configure.ac` according to comments.
+
+6. Update ABI reference.
+
+```
+$ abidw --out-file abi-ref/libusbguard.so.abi build/.libs/libusbguard.so
+$ sudo rm -rf build
+```
+
+7. Update the `VERSION` file and `CHANGELOG.md`. Commit your changes.
 
-4. Build the final release tarball.
+8. Build the final release tarball.
 
 ```
 $ ./autogen.sh
@@ -28,22 +48,22 @@ $ ../configure --with-crypto-library=gcrypt
 $ make dist
 ```
 
-5. Tag the release with a signed tag.
+9. Tag the release with a signed tag.
 
 ```
 $ git tag -s -m "usbguard-0.x.y" usbguard-0.x.y
 $ git push origin usbguard-0.x.x
 ```
 
-6. Hash and sign the release.
+10. Hash and sign the release.
 
 ```
 $ sha256sum usbguard-0.x.y.tar.gz > usbguard-0.x.y.tar.gz.sum
 $ gpg --armor --detach-sign usbguard-0.x.y.tar.gz
 $ gpg --clearsign usbguard-0.x.y.tar.gz.sum
 ```
 
-7. Create a new GitHub release using the associated tag; add the relevant section from CHANGELOG.md. Upload:
+11. Create a new GitHub release using the associated tag; add the relevant section from CHANGELOG.md. Upload:
 
     * usbguard-0.x.y.tar.gz
     * usbguard-0.x.y.tar.gz.asc