#1115 Updated Issue : documents updated accordingly : setup.rst , extension-module.rst

Author: RSzipper

contrib/code/setup.rst

@@ -10,3 +10,23 @@ Setup and building
 
 [More setup and build instructions specifically for code contributors, building
 on the basics from the :ref:`Getting Started <getting-started>` section.]
+
+.. _configure-cache:
+
+Using Configure Cache (`configure -C`)
+--------------------------------------
+
+### Overview  
+When running `./configure`, CPython performs a series of system checks to detect platform-specific settings. These checks can be time-consuming, especially for repeated builds.  
+
+By using **configure cache (`-C`)**, you can store previous configuration results, reducing redundant checks and **significantly speeding up build times**.  
+
+### Benefits of `configure -C`  
+- **Faster rebuilds**: Skips redundant system checks, improving efficiency.  
+- **Improves development workflow**: Optimizes the edit-configure-build-test cycle.  
+- **Reduces system load**: Avoids unnecessary reconfigurations.  
+
+### How to Use `configure -C`  
+To enable caching, run:  
+```sh
+./configure -C

developer-workflow/extension-modules.rst

@@ -275,6 +275,27 @@ Now that we have added our extension module to the CPython source tree,
 we need to update some configuration files in order to compile the CPython
 project on different platforms.
 
+-------------------------------------
+
+.. _configure-cache:
+
+Using Configure Cache (`configure -C`)
+--------------------------------------
+
+### Overview  
+When running `./configure`, CPython performs a series of system checks to detect platform-specific settings. These checks can be time-consuming, especially for repeated builds.  
+
+By using **configure cache (`-C`)**, you can store previous configuration results, reducing redundant checks and **significantly speeding up build times**.  
+
+### Benefits of `configure -C`  
+- **Faster rebuilds**: Skips redundant system checks, improving efficiency.  
+- **Improves development workflow**: Optimizes the edit-configure-build-test cycle.  
+- **Reduces system load**: Avoids unnecessary reconfigurations.  
+
+### How to Use `configure -C`  
+To enable caching, run:  
+```sh
+./configure -C
 Updating ``Modules/Setup.{bootstrap,stdlib}.in``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^