From 86caf2db80050b857fac77269708263a1826c5a2 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Thu, 13 Aug 2026 19:06:03 +0800
Subject: [MIRTool] Read stdin when no input path is given

---
 backend/tools/MIRTool/MIRToolMain.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'backend/tools')

diff --git a/backend/tools/MIRTool/MIRToolMain.cpp b/backend/tools/MIRTool/MIRToolMain.cpp
index d675f35..500eeb2 100644
--- a/backend/tools/MIRTool/MIRToolMain.cpp
+++ b/backend/tools/MIRTool/MIRToolMain.cpp
@@ -74,7 +74,7 @@ struct CommandLine final {
 };
 
 void printUsage(std::ostream &Output) {
-  Output << "usage: rcc-backend-mir [operation] [options] <input.mir|->\n"
+  Output << "usage: rcc-backend-mir [operation] [options] [input.mir|-]\n"
             "operations:\n"
             "  --verify                       Parse, canonicalize, and verify MIR\n"
             "  --reproduce <package>          Strictly replay a reproducer package\n"
@@ -656,7 +656,7 @@ void applyFeatureOverrides(std::vector<std::string> Overrides, std::vector<std::
       return rcc::makeUnexpected(ErrorCode::InvalidInvocation,
                                  "reproducer replay does not accept a separate MIR input");
   } else if (Command.InputPath.empty()) {
-    return rcc::makeUnexpected(ErrorCode::InvalidInvocation, "a MIR input path is required");
+    Command.InputPath = "-";
   }
   if (Command.Cache != CachePolicy::Off && Command.CachePath.empty()) {
     return rcc::makeUnexpected(ErrorCode::InvalidInvocation,
-- 
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