cargo-php 0.1.21 fails to link on macOS: undefined Zend symbols (Linux-only link flag in build.rs)

[Goopil]

Hi! cargo install cargo-php (0.1.21) fails on macOS — the build script only carries the Linux link flag.

$ cargo install cargo-php
error: linking with `cc` failed: exit status: 1
  = note: Undefined symbols for architecture arm64:
            "_zend_empty_string", referenced from: _ext_php_rs_zend_string_init in …-wrapper.o
            "_zend_hash_del", …
          clang: error: linker command failed with exit code 1

macOS links executables with -undefined error by default. The Zend symbols from wrapper.o can stay unresolved: cargo-php never calls those functions (stubs generation only dlopens the extension and reads its metadata).

Workaround:

$ RUSTFLAGS="-C link-arg=-Wl,-undefined,dynamic_lookup" cargo install cargo-php

Fix is one line in crates/cli/build.rs — PR to follow.

And thanks a lot for the project, it helps a lot! 🙇

[ptondereau]

merged the hotfix but i need to extract the describe part to another crate