From 1604716dfc493bf55bc1d87b5083bbe2ee709e60 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Mon, 25 Sep 2017 08:33:29 -0400
Subject: Revert "Performance: Improve efficiency of source file lookup in
 cmMakefile"

This reverts commit 3b95ab569345028a1a8fe521d5ecd81fa97f2653.
It regressed some legacy source file property behavior.
Revert pending further investigation.
---
 Source/cmMakefile.cxx | 50 +++-----------------------------------------------
 Source/cmMakefile.h   | 11 -----------
 2 files changed, 3 insertions(+), 58 deletions(-)

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index c96b892..e51cfcc 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -3082,18 +3082,9 @@ void cmMakefile::SetArgcArgv(const std::vector<std::string>& args)
 cmSourceFile* cmMakefile::GetSource(const std::string& sourceName) const
 {
   cmSourceFileLocation sfl(this, sourceName);
-
-#if defined(_WIN32) || defined(__APPLE__)
-  const auto& name = cmSystemTools::LowerCase(sfl.GetName());
-#else
-  const auto& name = sfl.GetName();
-#endif
-  auto sfsi = this->SourceFileSearchIndex.find(name);
-  if (sfsi != this->SourceFileSearchIndex.end()) {
-    for (auto sf : sfsi->second) {
-      if (sf->Matches(sfl)) {
-        return sf;
-      }
+  for (cmSourceFile* sf : this->SourceFiles) {
+    if (sf->Matches(sfl)) {
+      return sf;
     }
   }
   return nullptr;
@@ -3107,41 +3098,6 @@ cmSourceFile* cmMakefile::CreateSource(const std::string& sourceName,
     sf->SetProperty("GENERATED", "1");
   }
   this->SourceFiles.push_back(sf);
-
-  auto name = sf->GetLocation().GetName();
-#if defined(_WIN32) || defined(__APPLE__)
-  name = cmSystemTools::LowerCase(name);
-#endif
-
-  // For a file in the form "a.b.c" add the cmSourceFile to the index
-  // at "a.b.c", "a.b" and "a".
-  auto partial = name;
-  while (true) {
-    this->SourceFileSearchIndex[partial].insert(sf);
-    auto i = partial.rfind('.');
-    if (i == std::string::npos) {
-      break;
-    }
-    partial = partial.substr(0, i);
-  }
-
-  if (sf->GetLocation().ExtensionIsAmbiguous()) {
-    // For an ambiguous extension also add the various "known"
-    // extensions to the original filename.
-
-    const auto& srcExts = this->GetCMakeInstance()->GetSourceExtensions();
-    for (const auto& ext : srcExts) {
-      auto name_ext = name + "." + cmSystemTools::LowerCase(ext);
-      this->SourceFileSearchIndex[name_ext].insert(sf);
-    }
-
-    const auto& hdrExts = this->GetCMakeInstance()->GetHeaderExtensions();
-    for (const auto& ext : hdrExts) {
-      auto name_ext = name + "." + cmSystemTools::LowerCase(ext);
-      this->SourceFileSearchIndex[name_ext].insert(sf);
-    }
-  }
-
   return sf;
 }
 
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 2cae659..272522c 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -13,7 +13,6 @@
 #include <stddef.h>
 #include <string>
 #include <unordered_map>
-#include <unordered_set>
 #include <vector>
 
 #include "cmAlgorithms.h"
@@ -809,17 +808,7 @@ protected:
   // libraries, classes, and executables
   mutable cmTargets Targets;
   std::map<std::string, std::string> AliasTargets;
-
   std::vector<cmSourceFile*> SourceFiles;
-  // Because cmSourceFile names are compared in a fuzzy way (see
-  // cmSourceFileLocation::Match()) we can't have a straight mapping from
-  // filename to cmSourceFile.  To make lookups more efficient we store the
-  // Name portion of the cmSourceFileLocation and then compare on the list of
-  // cmSourceFiles that might match that name.  Note that on platforms which
-  // have a case-insensitive filesystem we store the key in all lowercase.
-  typedef std::unordered_set<cmSourceFile*> SourceFileSet;
-  typedef std::unordered_map<std::string, SourceFileSet> SourceFileMap;
-  SourceFileMap SourceFileSearchIndex;
 
   // Tests
   std::map<std::string, cmTest*> Tests;
-- 
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