Implemented git versioning

This patch automatically versions the shared libraries from any annotated `git` tags: ``` git tag -a v1.0.0 ``` It expects semver version tags such as `v1.0.0`. It would be trivial to support `1.0.0` but looking around it seems that most C/C++ projects follow `vX.X.X` rather that `X.X.X` like a lot of `Node.js` stuff. This determines that the if the project has had a certain amount of commits since the last tag and also if the project is _dirty_ (has modified files), but does __nothing__ with that information. In the future a more robust release could be implemented in the script. This is pretty brittle and has little in the way of configuration. Ideally we should use `find_program` to work out where `git` is so that users can configure it. This implementation assumes that `git` will be available in `PATH` Outputs the following on the command line: ``` -- git Version: v[MAJOR].[MINOR].[PATCH]-[COMMITS_SINCE_TAG]-[SHA1](-dirty)? -- Version: [MAJOR].[MINOR].[PATCH] ```

Implemented git versioning
d591edf5 · Matt Clarkson · 890908c1 · d591edf5
Commit d591edf5 authored Jul 30, 2014 by Matt Clarkson
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Showing with 31 additions and 2 deletions

CMakeLists.txt CMakeLists.txt +31 -2

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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,9 +38,38 @@ if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86")
 	add_definitions(-DARCH_X86)
 endif()
+# Read the git tags to determine the project version
+execute_process(COMMAND git describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8
+    RESULT_VARIABLE status
+    OUTPUT_VARIABLE GIT_VERSION
+    ERROR_QUIET)
+if(${status})
+    set(GIT_VERSION "v0.0.0")
+else()
+    string(STRIP ${GIT_VERSION} GIT_VERSION)
+    string(REGEX REPLACE "-[0-9]+-g" "-" GIT_VERSION ${GIT_VERSION})
+endif()
+# Work out if the repository is dirty
+execute_process(COMMAND git update-index -q --refresh
+    OUTPUT_QUIET
+    ERROR_QUIET)
+execute_process(COMMAND git diff-index --name-only HEAD --
+    OUTPUT_VARIABLE GIT_DIFF_INDEX
+    ERROR_QUIET)
+string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY)
+if (${GIT_DIRTY})
+    string(CONCAT GIT_VERSION ${GIT_VERSION} "-dirty")
+endif()
+# Tell the user what versions we are using
+message("-- git Version: ${GIT_VERSION}")
+string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" VERSION ${GIT_VERSION})
+message("-- Version: ${VERSION}")
 # The version of the libraries
-set(GENERIC_LIB_VERSION "0.0.0")
+set(GENERIC_LIB_VERSION ${VERSION})
-set(GENERIC_LIB_SOVERSION "0")
+string(SUBSTRING ${VERSION} 0 1 GENERIC_LIB_SOVERSION)
 # Set up directories
 include_directories(${PROJECT_SOURCE_DIR}/include)