From e9ee63ed033cb2fa64349fbe35f10e82ae264024 Mon Sep 17 00:00:00 2001
From: Alyssa Ross <hi@alyssa.is>
Date: Tue, 27 Feb 2024 23:24:28 +0100
Subject: [PATCH] cargo: support lib.path in Cargo.toml

Cargo implements this configuration option to override the entry point
of the library.

To get test coverage, I've modified one of the two Cargo subprojects
in the test to use a non-default library entrypoint.  The other still
uses the default.
---
 mesonbuild/cargo/interpreter.py                              | 5 +++--
 .../rust/22 cargo subproject/subprojects/foo-rs/Cargo.toml   | 1 +
 .../22 cargo subproject/subprojects/foo-rs/{src => }/lib.rs  | 0
 3 files changed, 4 insertions(+), 2 deletions(-)
 rename test cases/rust/22 cargo subproject/subprojects/foo-rs/{src => }/lib.rs (100%)

diff --git a/mesonbuild/cargo/interpreter.py b/mesonbuild/cargo/interpreter.py
index 2797f9fe0..3cbc453ef 100644
--- a/mesonbuild/cargo/interpreter.py
+++ b/mesonbuild/cargo/interpreter.py
@@ -206,6 +206,7 @@ class Library(BuildTarget):
 
     doctest: bool = True
     doc: bool = True
+    path: str = os.path.join('src', 'lib.rs')
     proc_macro: bool = False
     crate_type: T.List[manifest.CRATE_TYPE] = dataclasses.field(default_factory=lambda: ['lib'])
     doc_scrape_examples: bool = True
@@ -606,7 +607,7 @@ def _create_lib(cargo: Manifest, build: builder.Builder, crate_type: manifest.CR
 
     posargs: T.List[mparser.BaseNode] = [
         build.string(fixup_meson_varname(cargo.package.name)),
-        build.string(os.path.join('src', 'lib.rs')),
+        build.string(cargo.lib.path),
     ]
 
     kwargs: T.Dict[str, mparser.BaseNode] = {
@@ -696,7 +697,7 @@ def interpret(subp_name: str, subdir: str, env: Environment) -> T.Tuple[mparser.
 
     # Libs are always auto-discovered and there's no other way to handle them,
     # which is unfortunate for reproducability
-    if os.path.exists(os.path.join(env.source_dir, cargo.subdir, cargo.path, 'src', 'lib.rs')):
+    if os.path.exists(os.path.join(env.source_dir, cargo.subdir, cargo.path, cargo.lib.path)):
         for crate_type in cargo.lib.crate_type:
             ast.extend(_create_lib(cargo, build, crate_type))
 
diff --git a/test cases/rust/22 cargo subproject/subprojects/foo-rs/Cargo.toml b/test cases/rust/22 cargo subproject/subprojects/foo-rs/Cargo.toml
index 796548d63..0f0225d06 100644
--- a/test cases/rust/22 cargo subproject/subprojects/foo-rs/Cargo.toml	
+++ b/test cases/rust/22 cargo subproject/subprojects/foo-rs/Cargo.toml	
@@ -5,6 +5,7 @@ edition = "2021"
 
 [lib]
 crate-type = ["cdylib"]
+path = "lib.rs"
 
 # This dependency does not exist, verify optional works.
 [dependencies.notfound]
diff --git a/test cases/rust/22 cargo subproject/subprojects/foo-rs/src/lib.rs b/test cases/rust/22 cargo subproject/subprojects/foo-rs/lib.rs
similarity index 100%
rename from test cases/rust/22 cargo subproject/subprojects/foo-rs/src/lib.rs
rename to test cases/rust/22 cargo subproject/subprojects/foo-rs/lib.rs