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issue #1115 update :Add a sentence or two about the benefits of using configure cache , update in setup.rst , extension-modules.rst
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‎contrib/code/setup.rst‎

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@@ -10,3 +10,134 @@ Setup and building
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[More setup and build instructions specifically for code contributors, building
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on the basics from the :ref:`Getting Started <getting-started>` section.]
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.. _configure-cache:
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Using Configure Cache (`configure -C`)
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--------------------------------------
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When running `./configure`, CPython performs a series of system checks, which can take time.
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To speed up repeated builds, you can use the **configure cache**, which saves previous results:
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.. code-block:: sh
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./configure -C
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### **Benefits**
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- **Faster rebuilds**: Avoids redundant system checks, making subsequent runs quicker.
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- **Improves development workflow**: Speeds up the edit-configure-build-test cycle, especially for frequent changes.
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- **Reduces CPU and disk usage**: Skips unnecessary recomputation of configuration results.
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### **Clearing the Cache**
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If you modify system settings, upgrade dependencies, or suspect cache-related issues,
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clear the cache before reconfiguring to avoid outdated settings:
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.. code-block:: sh
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rm -f config.cache
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This ensures that `./configure` runs fresh system checks when necessary.
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### **When to Use `configure -C`**
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- **Use it** when making minor code changes that don’t affect system dependencies.
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- **Avoid it** after system updates, compiler changes, or dependency modifications to prevent build inconsistencies.
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---
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### **Why This Additional Detail?**
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- **The `-C` flag behavior**: Makes it clear when to use or avoid it.
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- **Cache clearing instructions**: Important to prevent build failures due to stale configuration data.
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- **More structured benefits**: Helps new contributors understand why they should use it.
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Would you like me to format this differently or adjust anything before you submit the PR? 🚀
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You said:
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i need a detailed version of this make it such that the chances of merging becomes 100%
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ChatGPT said:
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Here's a detailed and well-structured version of the documentation, ensuring clarity and completeness while following Python's devguide standards. This version should maximize your chances of merging the PR successfully.
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Final Version for setup.rst
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r
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Copy
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Edit
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.. _configure-cache:
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Using Configure Cache (`configure -C`)
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--------------------------------------
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### **Overview**
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When running `./configure`, CPython performs a series of system checks to detect available features, libraries, and compiler options. These checks help generate a proper `Makefile` for building CPython. However, a fresh configuration scan can take significant time, especially on slower systems or when running it frequently during development.
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To optimize this process, you can use the **configure cache** (`configure -C`), which saves the results of previous runs and reuses them for subsequent configurations.
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.. code-block:: sh
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./configure -C
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By caching detected system properties, this approach **eliminates redundant checks**, making reconfigurations significantly faster.
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---
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### **Benefits of Using Configure Cache**
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Using `configure -C` can enhance the development workflow in multiple ways:
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- **Speeds up rebuilds**: Avoids rechecking system dependencies, making incremental changes quicker.
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- **Reduces system load**: Skips redundant computations, lowering CPU usage.
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- **Improves iteration time**: Speeds up the edit-configure-build-test cycle, especially for developers frequently modifying CPython’s internals.
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- **Ensures consistency**: Maintains uniform configuration settings across multiple runs unless the cache is explicitly cleared.
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---
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### **When to Use `configure -C`?**
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| Scenario | Use `configure -C`? | Reason |
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|----------------------------------------------|-----------------|------------------------------------------------|
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| Small code changes (e.g., modifying `.c` files) | ✅ Yes | Avoids unnecessary reconfiguration steps. |
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| Frequent rebuilds without system changes | ✅ Yes | Saves time and system resources. |
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| Upgrading system libraries (e.g., OpenSSL) | ❌ No | Cache may store outdated results, leading to inconsistencies. |
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| Changing compiler settings or flags | ❌ No | A fresh `./configure` run is needed to reflect changes. |
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| Switching between Python build environments | ❌ No | Using cache might introduce conflicts between builds. |
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---
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### **Clearing the Configure Cache**
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If you have modified system settings, upgraded dependencies, or changed compiler options, it's recommended to **clear the cache** before re-running `./configure` to avoid build inconsistencies.
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To remove the cached configuration results, use:
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.. code-block:: sh
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rm -f config.cache
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This ensures that `./configure` performs a fresh system scan, preventing potential errors due to stale configuration data.
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**Best Practice**: If you encounter unexpected build issues after using `configure -C`, try clearing the cache first before debugging further.
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---
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### **Additional Notes**
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- `configure -C` only **caches successful test results**. If a check fails, it will still be re-run in subsequent configurations.
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- Some system changes might not require clearing the cache, but if in doubt, it's safer to remove it.
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- The cache is stored in `config.cache` in the build directory and is automatically used if present when `configure -C` is executed.
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---
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### **Summary**
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- `./configure -C` caches system checks to speed up rebuilds.
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- Recommended for frequent code changes but **not** for system or compiler updates.
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- Clear the cache using `rm -f config.cache` when necessary.
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By following these guidelines, you can make the most out of `configure -C` while ensuring stable and efficient builds.
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---

‎developer-workflow/extension-modules.rst‎

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Updating ``Modules/Setup.{bootstrap,stdlib}.in``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. _configure-cache:
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Using Configure Cache (`configure -C`)
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--------------------------------------
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When running `./configure`, CPython performs a series of system checks, which can take time.
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To speed up repeated builds, you can use the **configure cache**, which saves previous results:
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.. code-block:: sh
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./configure -C
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### **Benefits**
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- **Faster rebuilds**: Avoids redundant system checks, making subsequent runs quicker.
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- **Improves development workflow**: Speeds up the edit-configure-build-test cycle, especially for frequent changes.
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- **Reduces CPU and disk usage**: Skips unnecessary recomputation of configuration results.
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### **Clearing the Cache**
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If you modify system settings, upgrade dependencies, or suspect cache-related issues,
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clear the cache before reconfiguring to avoid outdated settings:
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.. code-block:: sh
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rm -f config.cache
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This ensures that `./configure` runs fresh system checks when necessary.
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### **When to Use `configure -C`**
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- **Use it** when making minor code changes that don’t affect system dependencies.
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- **Avoid it** after system updates, compiler changes, or dependency modifications to prevent build inconsistencies.
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---
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### **Why This Additional Detail?**
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- **The `-C` flag behavior**: Makes it clear when to use or avoid it.
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- **Cache clearing instructions**: Important to prevent build failures due to stale configuration data.
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- **More structured benefits**: Helps new contributors understand why they should use it.
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Would you like me to format this differently or adjust anything before you submit the PR? 🚀
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You said:
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i need a detailed version of this make it such that the chances of merging becomes 100%
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ChatGPT said:
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Here's a detailed and well-structured version of the documentation, ensuring clarity and completeness while following Python's devguide standards. This version should maximize your chances of merging the PR successfully.
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Final Version for setup.rst
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r
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Copy
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Edit
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.. _configure-cache:
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Using Configure Cache (`configure -C`)
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--------------------------------------
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### **Overview**
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When running `./configure`, CPython performs a series of system checks to detect available features, libraries, and compiler options. These checks help generate a proper `Makefile` for building CPython. However, a fresh configuration scan can take significant time, especially on slower systems or when running it frequently during development.
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To optimize this process, you can use the **configure cache** (`configure -C`), which saves the results of previous runs and reuses them for subsequent configurations.
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.. code-block:: sh
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./configure -C
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By caching detected system properties, this approach **eliminates redundant checks**, making reconfigurations significantly faster.
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---
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### **Benefits of Using Configure Cache**
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Using `configure -C` can enhance the development workflow in multiple ways:
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- **Speeds up rebuilds**: Avoids rechecking system dependencies, making incremental changes quicker.
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- **Reduces system load**: Skips redundant computations, lowering CPU usage.
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- **Improves iteration time**: Speeds up the edit-configure-build-test cycle, especially for developers frequently modifying CPython’s internals.
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- **Ensures consistency**: Maintains uniform configuration settings across multiple runs unless the cache is explicitly cleared.
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---
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### **When to Use `configure -C`?**
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| Scenario | Use `configure -C`? | Reason |
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|----------------------------------------------|-----------------|------------------------------------------------|
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| Small code changes (e.g., modifying `.c` files) | ✅ Yes | Avoids unnecessary reconfiguration steps. |
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| Frequent rebuilds without system changes | ✅ Yes | Saves time and system resources. |
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| Upgrading system libraries (e.g., OpenSSL) | ❌ No | Cache may store outdated results, leading to inconsistencies. |
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| Changing compiler settings or flags | ❌ No | A fresh `./configure` run is needed to reflect changes. |
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| Switching between Python build environments | ❌ No | Using cache might introduce conflicts between builds. |
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---
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### **Clearing the Configure Cache**
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If you have modified system settings, upgraded dependencies, or changed compiler options, it's recommended to **clear the cache** before re-running `./configure` to avoid build inconsistencies.
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To remove the cached configuration results, use:
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.. code-block:: sh
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rm -f config.cache
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This ensures that `./configure` performs a fresh system scan, preventing potential errors due to stale configuration data.
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**Best Practice**: If you encounter unexpected build issues after using `configure -C`, try clearing the cache first before debugging further.
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---
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### **Additional Notes**
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- `configure -C` only **caches successful test results**. If a check fails, it will still be re-run in subsequent configurations.
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- Some system changes might not require clearing the cache, but if in doubt, it's safer to remove it.
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- The cache is stored in `config.cache` in the build directory and is automatically used if present when `configure -C` is executed.
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---
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### **Summary**
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- `./configure -C` caches system checks to speed up rebuilds.
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- Recommended for frequent code changes but **not** for system or compiler updates.
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- Clear the cache using `rm -f config.cache` when necessary.
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By following these guidelines, you can make the most out of `configure -C` while ensuring stable and efficient builds.
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---
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Depending on whether the extension module is required to get a functioning
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interpreter or not, we update :cpy-file:`Modules/Setup.bootstrap.in` or

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