From 1994f950fff32cfcc20823269e008a34bfe6acf0 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyle.edwards@kitware.com>
Date: Wed, 18 Mar 2020 16:16:46 -0400
Subject: cmake: List valid values for --trace-format on the command line

---
 Source/cmake.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index f4b9f16..a99d9a6 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -751,7 +751,8 @@ void cmake::SetArgs(const std::vector<std::string>& args)
       const auto traceFormat =
         StringToTraceFormat(arg.substr(strlen("--trace-format=")));
       if (traceFormat == TraceFormat::TRACE_UNDEFINED) {
-        cmSystemTools::Error("Invalid format specified for --trace-format");
+        cmSystemTools::Error("Invalid format specified for --trace-format. "
+                             "Valid formats are human, json-v1.");
         return;
       }
       this->SetTraceFormat(traceFormat);
-- 
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