Linux FFI Extension

[KingBes]

Because of the limitations of the Linux system, it is possible to successfully compile the ffi extension, but it cannot be used to load other so extensions. The prerequisite for Linux to load so extensions is non-static compilation, but dynamic compilation conflicts with the purpose of this project.

This means that the composer package that requires ffi extension is not available, is there any alternative method?

[crazywhalecc]

See: #376 (comment)

[henderkes]

We shoulld reopen this now, I think. @crazywhalecc

[crazywhalecc]

Currently using bin/spc-gnu-docker build --libc=glibc ffi --build-cli is available. No pain, no extra patches. We don't need to reopen this issue, as it's available after glibc mode supported. But we do need to update the documentation, and I'll do that later.

[henderkes]

I didn't know we already had FFI as an extension. That makes sense.

[KingBes]

However, there are some issues with pure static linking of musl-libc binaries on Linux:
The dl() function in PHP cannot be used to load dynamic libraries and external PHP extensions.
The FFI extension in PHP cannot be used.
In some extreme cases, performance issues may occur. See musl-libc performance issues.

那么可以更换兼容 dl() 函数加载动态链接库和外部 PHP 扩展的编译器吗？比如：gcc 什么的。这样的话比较灵活一些。

[henderkes]

However, there are some issues with pure static linking of musl-libc binaries on Linux:
The dl() function in PHP cannot be used to load dynamic libraries and external PHP extensions.
The FFI extension in PHP cannot be used.
In some extreme cases, performance issues may occur. See musl-libc performance issues.

那么可以更换兼容 dl() 函数加载动态链接库和外部 PHP 扩展的编译器吗？比如：gcc 什么的。这样的话比较灵活一些。

#624

Sorry, I don't speak Chinese, but yes, dynamic loading of extensions works as long as they are compiled with the buildroot/bin/php-config and buildroot/bin/phpize.

FFI with dl() works too, if you enable it in php.ini.