From ffff6576b4754fec467e01039df6eb8149e11bed Mon Sep 17 00:00:00 2001
From: Martin Duffy <martin.duffy@kitware.com>
Date: Tue, 3 Feb 2026 09:15:49 -0500
Subject: [PATCH] instrumentation: Add project field to cmake content files

---
 Help/manual/cmake-instrumentation.7.rst                   | 3 +++
 Source/cmInstrumentation.cxx                              | 3 +++
 Tests/RunCMake/Instrumentation/check-custom-content.cmake | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/Help/manual/cmake-instrumentation.7.rst b/Help/manual/cmake-instrumentation.7.rst
index 9523e45902..d69d7b7c4d 100644
--- a/Help/manual/cmake-instrumentation.7.rst
+++ b/Help/manual/cmake-instrumentation.7.rst
@@ -563,6 +563,9 @@ corresponding to the CMake invocation responsible for generating its command.
 
 Each CMake content file contains the following:
 
+  ``project``
+    The value of :variable:`CMAKE_PROJECT_NAME`.
+
   ``custom``
     An object containing arbitrary JSON data specified by the user with the
     :ref:`cmake_instrumentation CUSTOM_CONTENT` functionality of the
diff --git a/Source/cmInstrumentation.cxx b/Source/cmInstrumentation.cxx
index d19dae0bf9..e9b398739f 100644
--- a/Source/cmInstrumentation.cxx
+++ b/Source/cmInstrumentation.cxx
@@ -40,6 +40,7 @@
 #include "cmTimestamp.h"
 #include "cmUVProcessChain.h"
 #include "cmValue.h"
+#include "cmake.h"
 
 using LoadQueriesAfter = cmInstrumentation::LoadQueriesAfter;
 
@@ -234,6 +235,8 @@ void cmInstrumentation::WriteCMakeContent(
   Json::Value root;
   root["targets"] = this->DumpTargets(gg);
   root["custom"] = this->customContent;
+  root["project"] =
+    gg->GetCMakeInstance()->GetCacheDefinition("CMAKE_PROJECT_NAME").GetCStr();
   this->WriteInstrumentationJson(
     root, "data/content",
     cmStrCat("cmake-", this->ComputeSuffixTime(), ".json"));
diff --git a/Tests/RunCMake/Instrumentation/check-custom-content.cmake b/Tests/RunCMake/Instrumentation/check-custom-content.cmake
index 3912445ca1..d527b2223f 100644
--- a/Tests/RunCMake/Instrumentation/check-custom-content.cmake
+++ b/Tests/RunCMake/Instrumentation/check-custom-content.cmake
@@ -15,6 +15,9 @@ set(firstFile "")
 foreach(content_file IN LISTS content_files)
   read_json("${content_file}" contents)
 
+  # Check project name
+  json_assert_key("${content_file}" "${contents}" project "instrumentation")
+
   # Check custom content
   string(JSON custom GET "${contents}" custom)
   json_assert_key("${content_file}" "${custom}" myString "string")