Rollup merge of #73347 - tmiasko:incompatible-sanitizers, r=nikic

Diagnose use of incompatible sanitizers

Emit an error when incompatible sanitizer are configured through command
line options. Previously the last one configured prevailed and others
were silently ignored.

Additionally use a set to represent configured sanitizers, making it
possible to enable multiple sanitizers at once. At least in principle,
since currently all of them are considered to be incompatible with
others.

src/test/ui/sanitize/incompatible.rs

@@ -0,0 +1,6 @@
+// compile-flags: -Z sanitizer=address -Z sanitizer=memory --target x86_64-unknown-linux-gnu
+// error-pattern: error: `-Zsanitizer=address` is incompatible with `-Zsanitizer=memory`
+
+#![feature(no_core)]
+#![no_core]
+#![no_main]

src/test/ui/sanitize/incompatible.stderr

@@ -0,0 +1,4 @@
+error: `-Zsanitizer=address` is incompatible with `-Zsanitizer=memory`
+
+error: aborting due to previous error
+

src/test/ui/sanitize/unsupported-target.rs

@@ -1,6 +1,5 @@
-// ignore-tidy-linelength
 // compile-flags: -Z sanitizer=leak --target i686-unknown-linux-gnu
-// error-pattern: error: LeakSanitizer only works with the `x86_64-unknown-linux-gnu` or `x86_64-apple-darwin` target
+// error-pattern: error: `-Zsanitizer=leak` only works with targets:
 
 #![feature(no_core)]
 #![no_core]

src/test/ui/sanitize/unsupported-target.stderr

@@ -1,4 +1,4 @@
-error: LeakSanitizer only works with the `x86_64-unknown-linux-gnu` or `x86_64-apple-darwin` target
+error: `-Zsanitizer=leak` only works with targets: x86_64-apple-darwin, x86_64-unknown-linux-gnu
 
 error: aborting due to previous error