Deal with changed git-log behavior in version 1.9.x.

The latest version of git-log tracks the origin of a given file through
sub-module commits. The macro AX_ABSOLUTE_HEADER, for instance, used to
have 6 commits attributed to it, but now it has 26:

  $ git log --oneline -- m4/ax_absolute_header.m4
  27948f4 ALL: update web site URL to http://www.gnu.org/software/autoconf-archive/MACRO-NAME.html
  c6b6f51 Assigned all macros a unique serial number.
  89b80e0 Augmented the text of the all-permissive license by an express warranty disclaimer.
  d722dcd Add AU_ALIAS calls to new files for all recently renamed macros.
  6fc99d3 Center the URL at the top of every file and use consistent word-wrapping.
  acffb06 Rename gl_TRILINOS_ABSOLUTE_HEADER to AX_ABSOLUTE_HEADER.
  054e8ad remove m4 submodule
  fa1b1bb m4: update reference to macro branch
  548839e m4: update reference to macro branch
  d9afb8a m4: update reference to macro branch
  8968e9d m4: update reference to macro branch
  862b513 Avoid non-ASCII characters in m4 files.
  d7160b6 m4: update reference to macro branch
  9062013 m4: update reference to macro branch
  3cf85b5 m4: update reference to macro branch
  49af2e9 m4: update reference to macro branch
  950f2a7 m4: update reference to macro branch
  c610f41 m4: update reference to macro branch
  78d7777 m4: update reference to macro branch
  ddd0b53 m4: update reference to macro branch
  fcb87e1 m4: update reference to macro branch
  702ea3c m4: update reference to macro branch
  cee9eea m4: update reference to macro branch
  e3df236 m4: update reference to macro branch
  3c89e38 m4: update reference to macro branch
  3b30002 maint: added initial version of the toolchain

This new behavior means that most of our macros suddenly experience large
bumps in their #serial number for no apparent reason.

To prevent this situation, we limit the version history git-log may
consider to 054e8ad..HEAD, i.e. all commits prior to the sub-module merge
don't count. This gives us the old behavior of git-log back.

1 files changed, 1 insertions, 1 deletions

diff --git a/macro.py b/macro.py
index f2f8533..1803c19 100755
--- a/macro.py
+++ b/macro.py
@@ -106,7 +106,7 @@ class Macro:
       self.__dict__[key] = body
     # determine the macro's serial number
     if computeSerialNumber:     # compute the number from git
-      logMessages = subprocess.check_output(["git", "log", "--oneline", "--", filePath], bufsize=1)
+      logMessages = subprocess.check_output(["git", "log", "--oneline", "054e8ad8c766afa7059d8cd4a81bbfa99133ef5e..HEAD", "--", filePath], bufsize=1)
       logLines = logMessages.rstrip(b'\n').split(b"\n")
       self.serial = len(logLines)
       modified = subprocess.call(["git", "diff", "--quiet", "--exit-code", "HEAD", "--", filePath])