Rollup merge of #65314 - tmiasko:rustdoc-z, r=ollie27

rustdoc: forward -Z options to rustc

Currently rustdoc does not forward `-Z` options to rustc when building
test executables. This makes impossible to use rustdoc to run test
samples when crate under test is instrumented with one of sanitizers
`-Zsanitizer=...`, since the final linking step will not include
sanitizer runtime library.

Forward `-Z` options to rustc to solve the issue.

Helps with #43031.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/test/rustdoc/sanitizer-option.rs b/src/test/rustdoc/sanitizer-option.rs
new file mode 100644
index 00000000000..6af9ed3e33f
--- /dev/null
+++ b/src/test/rustdoc/sanitizer-option.rs
@@ -0,0 +1,17 @@
+// needs-sanitizer-support
+// compile-flags: --test -Z sanitizer=address
+//
+// #43031: Verify that rustdoc passes `-Z` options to rustc. Use an extern
+// function that is provided by the sanitizer runtime, if flag is not passed
+// correctly, then linking will fail.
+
+/// ```
+/// extern {
+///     fn __sanitizer_print_stack_trace();
+/// }
+///
+/// fn main() {
+///     unsafe { __sanitizer_print_stack_trace() };
+/// }
+/// ```
+pub fn z_flag_is_passed_to_rustc() {}