[Pkg-rust-maintainers] rust-libcst : FTBFS on power systems with linkage error

[Trupti]

Control: severity 1142711 serious

Hello,


The package is falling because:

The [[bin]] "parse" target in Cargo.toml is compiled with
feature="py" active, which enables pyo3/extension-module. Since
pyo3 >= 0.27 this feature suppresses -lpython from the linker
command. During cross-compilation no target Python interpreter
is available, so all Python C-API symbols (PyTuple_New,
_Py_Dealloc, PyGILState_Ensure, etc.) are unresolved -> link fails.

The binary is not shipped in any Debian package (bin=false in
debcargo.toml), so the fix is simply to disable building it,
the same way benchmarks are disabled in the existing
debian/patches/disable-benches patch.

Below patch fix the issue on all ppc64el, powerpc and ppc64 architecture
I have tested it on my ppc64el system.


Index: rust-libcst-1.8.6/Cargo.toml
===================================================================
--- rust-libcst-1.8.6.orig/Cargo.toml
+++ rust-libcst-1.8.6/Cargo.toml
@@ -49,7 +49,7 @@ crate-type = [
  ]
  path = "src/lib.rs"

-[[bin]]
+[[disabled.bin]]
  name = "parse"
  path = "src/bin.rs"



Thanks,
Trupti