Rollup merge of #106912 - gftea:pr-106736, r=Nilstrieb

check -Z query-dep-graph is enabled if -Z dump-dep-graph (#106736)

PR to solve #106736, r? `@cjgillot`

Author: matthiaskrgr

compiler/rustc_session/src/config.rs

@@ -2459,6 +2459,11 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
 
     let pretty = parse_pretty(&unstable_opts, error_format);
 
+    // query-dep-graph is required if dump-dep-graph is given #106736
+    if unstable_opts.dump_dep_graph && !unstable_opts.query_dep_graph {
+        early_error(error_format, "can't dump dependency graph without `-Z query-dep-graph`");
+    }
+
     // Try to find a directory containing the Rust `src`, for more details see
     // the doc comment on the `real_rust_source_base_dir` field.
     let tmp_buf;

tests/ui/dep-graph/dep-graph-dump.rs

@@ -0,0 +1,6 @@
+// Test dump-dep-graph requires query-dep-graph enabled
+
+// incremental
+// compile-flags: -Z dump-dep-graph
+
+fn main() {}

tests/ui/dep-graph/dep-graph-dump.stderr

@@ -0,0 +1,2 @@
+error: can't dump dependency graph without `-Z query-dep-graph`
+