cmake: specify project version

We currently do not set up a project version within CMake, meaning that
it can't be use by other projects including libgit2 as a sub-project and
also not by other tools like IDEs.

This commit changes this to always set up a project version, but instead
of extracting it from the "version.h" header we now set it up directly.
This is mostly to avoid mis-use of the previous `LIBGIT2_VERSION`
variables, as we should now always use the `libgit2_VERSION` ones that
are set up by CMake if one provides the "VERSION" keyword to the
`project()` call. While this is one more moving target we need to adjust
on releases, this commit also adjusts our release script to verify that
the project version was incremented as expected.

1 files changed, 9 insertions, 0 deletions

diff --git a/script/release.py b/script/release.py
index 99ff8ecaf..1a240deca 100755
--- a/script/release.py
+++ b/script/release.py
@@ -40,6 +40,15 @@ def verify_version(version):
         'SOVERSION':    [ '"{}.{}"'.format(version.major, version.minor), None ],
     }
 
+    # Parse CMakeLists
+    with open('CMakeLists.txt') as f:
+        for line in f.readlines():
+            if line.startswith('project(libgit2 VERSION "{}"'.format(version)):
+                break
+        else:
+            raise Error("cmake: invalid project definition")
+
+    # Parse version.h
     with open('include/git2/version.h') as f:
         lines = f.readlines()