TestGenerator: Record support file and line where test was added

Add internal test properties that ctest can use to report where
the test was added in CMake code.

2 files changed, 29 insertions, 0 deletions

diff --git a/Source/CTest/cmCTestTestHandler.cxx b/Source/CTest/cmCTestTestHandler.cxx
index 2e1bb0a..9fd2299 100644
--- a/Source/CTest/cmCTestTestHandler.cxx
+++ b/Source/CTest/cmCTestTestHandler.cxx
@@ -2147,6 +2147,32 @@ bool cmCTestTestHandler::SetTestsProperties(
     for (std::string const& t : tests) {
       for (cmCTestTestProperties& rt : this->TestList) {
         if (t == rt.Name) {
+          if (key == "_BACKTRACE_TRIPLES") {
+            std::vector<std::string> triples;
+            // allow empty args in the triples
+            cmSystemTools::ExpandListArgument(val, triples, true);
+
+            // Ensure we have complete triples otherwise the data is corrupt.
+            if (triples.size() % 3 == 0) {
+              cmState state;
+              rt.Backtrace = cmListFileBacktrace(state.CreateBaseSnapshot());
+
+              // the first entry represents the top of the trace so we need to
+              // reconstruct the backtrace in reverse
+              for (size_t i = triples.size(); i >= 3; i -= 3) {
+                cmListFileContext fc;
+                fc.FilePath = triples[i - 3];
+                long line = 0;
+                if (!cmSystemTools::StringToLong(triples[i - 2].c_str(),
+                                                 &line)) {
+                  line = 0;
+                }
+                fc.Line = line;
+                fc.Name = triples[i - 1];
+                rt.Backtrace = rt.Backtrace.Push(fc);
+              }
+            }
+          }
           if (key == "WILL_FAIL") {
             rt.WillFail = cmSystemTools::IsOn(val);
           }
diff --git a/Source/CTest/cmCTestTestHandler.h b/Source/CTest/cmCTestTestHandler.h
index bcacf23..0b557db 100644
--- a/Source/CTest/cmCTestTestHandler.h
+++ b/Source/CTest/cmCTestTestHandler.h
@@ -7,6 +7,7 @@
 
 #include "cmCTestGenericHandler.h"
 #include "cmDuration.h"
+#include "cmListFileCache.h"
 
 #include "cmsys/RegularExpression.hxx"
 #include <chrono>
@@ -141,6 +142,8 @@ public:
     std::set<std::string> FixturesCleanup;
     std::set<std::string> FixturesRequired;
     std::set<std::string> RequireSuccessDepends;
+    // Private test generator properties used to track backtraces
+    cmListFileBacktrace Backtrace;
   };
 
   struct cmCTestTestResult