bpo-43774: Document configure options (GH-25283)
Add Doc/using/configure.rst documentation to document configure,
preprocessor, compiler and linker options.
Add a new section about the "Python debug build".
diff --git a/Doc/library/decimal.rst b/Doc/library/decimal.rst
index e194649..35a263a 100644
--- a/Doc/library/decimal.rst
+++ b/Doc/library/decimal.rst
@@ -1484,7 +1484,8 @@
.. data:: HAVE_CONTEXTVAR
- The default value is ``True``. If Python is compiled ``--without-decimal-contextvar``,
+ The default value is ``True``. If Python is :option:`configured with
+ --without-decimal-contextvar <--without-decimal-contextvar>`,
the C version uses a thread-local rather than a coroutine-local context and the value
is ``False``. This is slightly faster in some nested context scenarios.