1 files changed, 50 insertions, 0 deletions
diff --git a/cmake/GitVersion.cmake b/cmake/GitVersion.cmake
new file mode 100644
index 000000000..7044aaffc
--- /dev/null
+++ b/cmake/GitVersion.cmake
@@ -0,0 +1,50 @@
+find_package(Git)
+
+# Extract a version from the latest tag matching something like v1.2.3.4
+function(get_git_version var dir)
+    if(NOT DEFINED ${var})
+        set(version "0.0")
+        if(GIT_EXECUTABLE)
+            set(command
+                "${GIT_EXECUTABLE}"
+                -C
+                "${dir}"
+                describe
+                --abbrev=0
+                --tags
+                --match
+                v*
+            )
+            execute_process(
+                COMMAND ${command}
+                RESULT_VARIABLE result
+                OUTPUT_STRIP_TRAILING_WHITESPACE
+                OUTPUT_VARIABLE version
+            )
+            if(NOT result EQUAL 0)
+                message(
+                    WARNING
+                    "Getting ${var} failed: ${command} returned ${result}"
+                )
+            elseif("${version}" MATCHES "^v([0-9]+(\.[0-9]+)*).*")
+                set(version "${CMAKE_MATCH_1}")
+            else()
+                message(
+                    WARNING
+                    "Couldn't parse numeric version (like v1.2.3) from ${version}"
+                )
+            endif()
+        else()
+            message(
+                WARNING
+                "Couldn't find git executable to get ${var}, please use -D${var}"
+            )
+        endif()
+    endif()
+
+    set(${var}
+        ${version}
+        CACHE STRING
+        "The project version, detected using git if available"
+    )
+endfunction()