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* test/Makefile.in (ELFILES): Exclude module test if modules aren't
configured.
(EMACS_TEST_DIRECTORY): Expand test directory so that it's set
correctly even if Emacs changes the current directory.
($(srcdir)/src/emacs-module-tests.log)
($(test_module)): Proper dependency tracking for test module.

* test/data/emacs-module/Makefile (ROOT): Adapt to new location.
Remove 'check' target and EMACS variable, which are no longer
necessary.
(SO): Change to include period.

* test/src/emacs-module-tests.el (mod-test): Use EMACS_TEST_DIRECTORY
environment variable to reliably find test data.

* configure.ac (HAVE_MODULES, MODULES_SUFFIX): Add necessary
substitutions.

* test.el (mod-test-non-local-exit-signal-test): Compare actual
  backtrace to expected backtrace.

Run admin/update-copyright.

Run admin/update-copyright.

* modules/mod-test/test.el (mod-test-sum-test):
Bring back the 2**29 tests, but port them to 32-bit Emacs
--without-wide-int.

* modules/mod-test/test.el (mod-test-sum-test):
Don’t attempt to match descriptions to operating systems.
It didn’t work on Fedora x86-64 running a 32-bit executable,
and it’s not worth the trouble anyway.
Port to 32-bit platforms by removing an assumption about
fixnum widths.

* src/emacs-module.c (value_to_lisp) [WIDE_EMACS_INT]: Use
unsigned data types to manipulate pointers, to avoid sign
extension coming after us with a vengeance.

* modules/mod-test/test.el (mod-test-sum-test): Add tests for
Emacs with wide ints that verify integer values near the critical
value that requires us to switch to a cons cell.

* src/emacs-module.c (lisp_to_value): Compare the produced value
with the original Lisp object, not with the one potentially
converted into a Lisp_Cons.  Fixes assertion violations when
working with integers larger than fit into a 32-bit value.

* modules/mod-test/test.el (mod-test-sum-test): Add tests for
large integers, to test --with-wide-int.

* modules/mod-test/test.el (mod-test-sum-test): Update to
accommodate the lack of dladdr on Cygwin.

* modules/mod-test/test.el (mod-test-sum-test): Add tests for
wrong-type-argument.

* modules/mod-test/test.el (mod-test-sum-test): Test the error
signaled when the function is invoked with a wrong number of
arguments.

This is mostly indenting and spacing changes.  Also, remove
some unnecessary static decls instead of bothering to reindent them.
* src/module.h (EMACS_EXTERN_C_BEGIN): Remove, and do this inline,
as most other Emacs files do for this sort of thing.

Put them in the usual format for GNU Emacs copyright notices.

Add 'modhelp.py' script (python2) to automate module testing and
module generation.

To build and test all modules in the modules/ dir
  $ ./modhelp.py test

To generate a module from template code (good starting point)
  $ ./modhelp init mynewtestmodule

See the script -h option for more documentation.

* modules/modhelp.py: New module helper script.
* modules/mod-test/Makefile: New file. Makefile for the test module.
* modules/mod-test/mod-test.c: New file. Test module source file.
* modules/mod-test/test.el: New file. ert test suite for the test module.
* modules/.gitignore: New file. Local .gitignore file.
Co-authored-by: Philipp Stephani <phst@google.com>