find_*: Use debug logging infrastructure

Teach the find_package, find_library, find_program, find_path, and
find_file commands to print debug log messages when enabled by the
`--debug-find` command-line option or `CMAKE_FIND_DEBUG_MODE` variable.

1 files changed, 12 insertions, 5 deletions

diff --git a/Source/cmFindPathCommand.cxx b/Source/cmFindPathCommand.cxx
index f5e2631..908f0c1 100644
--- a/Source/cmFindPathCommand.cxx
+++ b/Source/cmFindPathCommand.cxx
@@ -21,6 +21,7 @@ cmFindPathCommand::cmFindPathCommand(cmExecutionStatus& status)
 // cmFindPathCommand
 bool cmFindPathCommand::InitialPass(std::vector<std::string> const& argsIn)
 {
+  this->DebugMode = ComputeIfDebugModeWanted();
   this->VariableDocumentation = "Path to a file.";
   this->CMakePathName = "INCLUDE";
   if (!this->ParseArguments(argsIn)) {
@@ -55,16 +56,19 @@ bool cmFindPathCommand::InitialPass(std::vector<std::string> const& argsIn)
 
 std::string cmFindPathCommand::FindHeader()
 {
+  std::string debug_name = this->IncludeFileInPath ? "find_file" : "find_path";
+  cmFindBaseDebugState debug(debug_name, this);
   std::string header;
   if (this->SearchFrameworkFirst || this->SearchFrameworkOnly) {
-    header = this->FindFrameworkHeader();
+    header = this->FindFrameworkHeader(debug);
   }
   if (header.empty() && !this->SearchFrameworkOnly) {
-    header = this->FindNormalHeader();
+    header = this->FindNormalHeader(debug);
   }
   if (header.empty() && this->SearchFrameworkLast) {
-    header = this->FindFrameworkHeader();
+    header = this->FindFrameworkHeader(debug);
   }
+
   return header;
 }
 
@@ -116,28 +120,31 @@ std::string cmFindPathCommand::FindHeaderInFramework(std::string const& file,
   return "";
 }
 
-std::string cmFindPathCommand::FindNormalHeader()
+std::string cmFindPathCommand::FindNormalHeader(cmFindBaseDebugState& debug)
 {
   std::string tryPath;
   for (std::string const& n : this->Names) {
     for (std::string const& sp : this->SearchPaths) {
       tryPath = cmStrCat(sp, n);
       if (cmSystemTools::FileExists(tryPath)) {
+        debug.FoundAt(tryPath);
         if (this->IncludeFileInPath) {
           return tryPath;
         }
         return sp;
       }
+      debug.FailedAt(tryPath);
     }
   }
   return "";
 }
 
-std::string cmFindPathCommand::FindFrameworkHeader()
+std::string cmFindPathCommand::FindFrameworkHeader(cmFindBaseDebugState& debug)
 {
   for (std::string const& n : this->Names) {
     for (std::string const& sp : this->SearchPaths) {
       std::string fwPath = this->FindHeaderInFramework(n, sp);
+      fwPath.empty() ? debug.FailedAt(fwPath) : debug.FoundAt(fwPath);
       if (!fwPath.empty()) {
         return fwPath;
       }