@TimWolla

As you can see for the extensions where you commented the build failures, the bundled extensions are not tested outside of PHP’s build system

Yes, my plan here is to add an integration test that does a test pie install <package> for each of these defined ones. I'm working on that next so you'll see what I mean shortly

The bundled extensions really should just be installed by the respective package manager.

This was my expectation too, but we have had several requests, I think the most common would be PDO*, bcmath, mbstring.

Yes, my plan here is to add an integration test that does a test pie install <package> for each of these defined ones. I'm working on that next so you'll see what I mean shortly

Just building extensions is not a sufficient guarantee that they'll work correctly. As an example MySQLnd relies on OpenSSL for the TLS support and trying to build MySQLnd in a standalone fashion is not unlikely to result in a version without TLS support, even when OpenSSL is loaded in PHP as a shared module.

Besides the remarks, I'm more generally concerned about this.

To expand on this a little more: It would also make it easy to accidentally run subtly different patch versions of the bundled libraries, leading to confusion when reporting issues. Consider the following:

• PHP installed via the package manager (8.2.28 at the time of writing for Debian Stable).
• pdo_mysql installed via PIE (8.2.29 at the time of writing)
• mysqlnd installed via PIE (8.2.25, because the user didn't update it)

Now a user finds a bug in the MySQL integration and reports it as “I'm using PHP 8.2.28” and folks are left confused, because the bug had already been fixed in MySQLnd with PHP 8.2.27, but the user didn't install the updated mysqlnd with PIE. Over time the versions will diverge further when half of the stuff was installed with the package manager and the other half with PIE. Or possibly some extension is installed with PIE and then later the corresponding package is installed with the package manager, leading to both the package manager and the PIE version being installed and fighting with each other.

Instead it would probably make sense to report a helpful message when running pie install pdo_mysql to indicate something like:

It seems you are running PHP installed via Debian’s packages. Use apt install php8.2-mysql to install pdo_mysql.

or

You are running in Docker, use docker-php-ext-install pdo_mysql

or similar.