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-rw-r--r--compiler/rustc_session/src/config.rs4
-rw-r--r--compiler/rustc_session/src/options.rs3
2 files changed, 6 insertions, 1 deletions
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 19cd2385992..b0d39b95313 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -1762,6 +1762,10 @@ pub fn build_session_options(matches: &getopts::Matches) -> Options {
         debugging_opts.symbol_mangling_version = SymbolManglingVersion::V0;
     }
 
+    if let Ok(graphviz_font) = std::env::var("RUSTC_GRAPHVIZ_FONT") {
+        debugging_opts.graphviz_font = graphviz_font;
+    }
+
     if !cg.embed_bitcode {
         match cg.lto {
             LtoCli::No | LtoCli::Unspecified => {}
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index 60bd557b880..4d35ec2e5d9 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -910,7 +910,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     graphviz_dark_mode: bool = (false, parse_bool, [UNTRACKED],
         "use dark-themed colors in graphviz output (default: no)"),
     graphviz_font: String = ("Courier, monospace".to_string(), parse_string, [UNTRACKED],
-        "use the given `fontname` in graphviz output (default: `Courier, monospace`)"),
+        "use the given `fontname` in graphviz output; can be overridden by setting \
+        environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)"),
     hir_stats: bool = (false, parse_bool, [UNTRACKED],
         "print some statistics about AST and HIR (default: no)"),
     human_readable_cgu_names: bool = (false, parse_bool, [TRACKED],