Pass the current cargo to `run-make` tests

A couple tests were using `BOOTSTRAP_CARGO` with `-Zbuild-std`, but that
stage0 cargo might not always be in sync with in-tree changes. In
particular, those tests started failing on the beta branch because the
older cargo couldn't find the library `Cargo.lock`, and then couldn't
build the latest version of `compiler_builtins` that had nightly changes.

3 files changed, 14 insertions, 0 deletions

diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index 5c18179b6fe..414f9f3a7f1 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -183,6 +183,9 @@ pub struct Config {
     /// The rustc executable.
     pub rustc_path: PathBuf,
 
+    /// The cargo executable.
+    pub cargo_path: Option<PathBuf>,
+
     /// The rustdoc executable.
     pub rustdoc_path: Option<PathBuf>,
 
diff --git a/src/tools/compiletest/src/lib.rs b/src/tools/compiletest/src/lib.rs
index 250b5084d13..3339116d542 100644
--- a/src/tools/compiletest/src/lib.rs
+++ b/src/tools/compiletest/src/lib.rs
@@ -47,6 +47,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
     opts.reqopt("", "compile-lib-path", "path to host shared libraries", "PATH")
         .reqopt("", "run-lib-path", "path to target shared libraries", "PATH")
         .reqopt("", "rustc-path", "path to rustc to use for compiling", "PATH")
+        .optopt("", "cargo-path", "path to cargo to use for compiling", "PATH")
         .optopt("", "rustdoc-path", "path to rustdoc to use for compiling", "PATH")
         .optopt("", "coverage-dump-path", "path to coverage-dump to use in tests", "PATH")
         .reqopt("", "python", "path to python to use for doc tests", "PATH")
@@ -260,6 +261,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
         compile_lib_path: make_absolute(opt_path(matches, "compile-lib-path")),
         run_lib_path: make_absolute(opt_path(matches, "run-lib-path")),
         rustc_path: opt_path(matches, "rustc-path"),
+        cargo_path: matches.opt_str("cargo-path").map(PathBuf::from),
         rustdoc_path: matches.opt_str("rustdoc-path").map(PathBuf::from),
         coverage_dump_path: matches.opt_str("coverage-dump-path").map(PathBuf::from),
         python: matches.opt_str("python").unwrap(),
@@ -364,6 +366,7 @@ pub fn log_config(config: &Config) {
     logv(c, format!("compile_lib_path: {:?}", config.compile_lib_path));
     logv(c, format!("run_lib_path: {:?}", config.run_lib_path));
     logv(c, format!("rustc_path: {:?}", config.rustc_path.display()));
+    logv(c, format!("cargo_path: {:?}", config.cargo_path));
     logv(c, format!("rustdoc_path: {:?}", config.rustdoc_path));
     logv(c, format!("src_base: {:?}", config.src_base.display()));
     logv(c, format!("build_base: {:?}", config.build_base.display()));
diff --git a/src/tools/compiletest/src/runtest/run_make.rs b/src/tools/compiletest/src/runtest/run_make.rs
index 852568ae925..75fe6a6baaf 100644
--- a/src/tools/compiletest/src/runtest/run_make.rs
+++ b/src/tools/compiletest/src/runtest/run_make.rs
@@ -61,6 +61,10 @@ impl TestCx<'_> {
             .env_remove("MFLAGS")
             .env_remove("CARGO_MAKEFLAGS");
 
+        if let Some(ref cargo) = self.config.cargo_path {
+            cmd.env("CARGO", cwd.join(cargo));
+        }
+
         if let Some(ref rustdoc) = self.config.rustdoc_path {
             cmd.env("RUSTDOC", cwd.join(rustdoc));
         }
@@ -409,6 +413,10 @@ impl TestCx<'_> {
             // through a specific CI runner).
             .env("LLVM_COMPONENTS", &self.config.llvm_components);
 
+        if let Some(ref cargo) = self.config.cargo_path {
+            cmd.env("CARGO", source_root.join(cargo));
+        }
+
         if let Some(ref rustdoc) = self.config.rustdoc_path {
             cmd.env("RUSTDOC", source_root.join(rustdoc));
         }