Enable --all-features when building source distribution (#2215)

When building sdist, `cargo metadata` command should output
all dependencies including optional ones, otherwise the resulting
sdist file may not compile when building with optional features
activated.

Enabling `--all-features` ensure that all optional path dependencies
to be packaged into sdist, which should help with #2117.

src/main.rs

@@ -311,6 +311,9 @@ fn pep517(subcommand: Pep517Command) -> Result<()> {
  out: Some(sdist_directory),
  cargo: CargoOptions {
  manifest_path,
+ // Enable all features to ensure all optional path dependencies are packaged
+ // into source distribution
+ all_features: true,
  ..Default::default()
  },
  ..Default::default()
@@ -417,6 +420,9 @@ fn run() -> Result<()> {
  out,
  cargo: CargoOptions {
  manifest_path,
+ // Enable all features to ensure all optional path dependencies are packaged
+ // into source distribution
+ all_features: true,
  ..Default::default()
  },
  ..Default::default()