[SCM] archer-tromey-python-checker: add README.archer

[tromey@sourceware.org]

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- Log -----------------------------------------------------------------
commit b8b589ef1e9aeddb2600fce6cf13b8890e14a8eb
Author: Tom Tromey <tromey@redhat.com>
Date:   Fri Feb 22 12:03:50 2013 -0700

    add README.archer

-----------------------------------------------------------------------

Summary of changes:
 README.archer |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
 create mode 100644 README.archer

First 500 lines of diff:
diff --git a/README.archer b/README.archer
new file mode 100644
index 0000000..f3c50db
--- /dev/null
+++ b/README.archer
@@ -0,0 +1,13 @@
+This branch holds some changes for use with the CPython checker:
+
+    https://gcc-python-plugin.readthedocs.org/en/latest/cpychecker.html
+
+Mostly this consists of adding attributes to various declarations, so
+that the checker can do its work.
+
+A few useful attributes have been added since this branch was written,
+for example, "cpychecker_sets_exception".
+
+The checker doesn't fully work on gdb due to cleanups.  We would have
+to teach it about these specially, or avoid their use in the Python
+layer.


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