The "make -C ReleaseNotes" used to produce a version descriptor like:
X.Y (from X.Y-rcN-...)
when the ReleaseNotes-X.Y.txt wasn't changed in the vX.Y tagged commit.
For example, if we checked out the v2.10 and then built the
ReleaseNotes-2.10.txt the version string in the html file was:
2.10 (from v2.10-rc2-...)
which wasn't really nice for a final release. I had to change the
generated html file manually.
Here is an overview of how this change improves the computation of the
version string for the ReleaseNotes-2.10.txt file:
Checked out | Version (before) | Version (after)
------------+--------------------------+---------------------
v2.10-rc2 | 2.10 (from 2.10-rc1-...) | 2.10 (from v2.10-rc2)
v2.10 | 2.10 (from 2.10-rc2-...) | 2.10
master | 2.10 (from 2.10-rc2-...) | 2.10
Only add the "(from N)" suffix if the ReleaseNotes-X.Y.txt is
different in HEAD and in the vX.Y. In the "(from N)" string compute the
N as "git describe HEAD" instead of describing the last commit where the
ReleaseNotes-X.Y was changed.
Change-Id: I66aff6cc57cfbd42a332ca19445dedbfbee0b088
(cherry picked from commit 25bd938158)
958d8e734b