Ninja: Detect when ninja is new enough to support a multi-line depfile

Ninja 1.9 supports the multi-line depfile format generated by the
Intel Compiler for Windows.  Teach the global generator to detect
when the version is new enough to support this.

Source/cmGlobalNinjaGenerator.cxx

@@ -454,6 +454,7 @@ cmGlobalNinjaGenerator::cmGlobalNinjaGenerator(cmake* cm)
   , NinjaSupportsConsolePool(false)
   , NinjaSupportsImplicitOuts(false)
   , NinjaSupportsManifestRestat(false)
+  , NinjaSupportsMultilineDepfile(false)
   , NinjaSupportsDyndeps(0)
 {
 #ifdef _WIN32
@@ -581,6 +582,9 @@ void cmGlobalNinjaGenerator::CheckNinjaFeatures()
   this->NinjaSupportsManifestRestat = !cmSystemTools::VersionCompare(
     cmSystemTools::OP_LESS, this->NinjaVersion.c_str(),
     RequiredNinjaVersionForManifestRestat().c_str());
+  this->NinjaSupportsMultilineDepfile = !cmSystemTools::VersionCompare(
+    cmSystemTools::OP_LESS, this->NinjaVersion.c_str(),
+    RequiredNinjaVersionForMultilineDepfile().c_str());
   {
     // Our ninja branch adds ".dyndep-#" to its version number,
     // where '#' is a feature-specific version number.  Extract it.
@@ -1478,6 +1482,11 @@ bool cmGlobalNinjaGenerator::SupportsManifestRestat() const
   return this->NinjaSupportsManifestRestat;
 }
 
+bool cmGlobalNinjaGenerator::SupportsMultilineDepfile() const
+{
+  return this->NinjaSupportsMultilineDepfile;
+}
+
 void cmGlobalNinjaGenerator::WriteTargetClean(std::ostream& os)
 {
   WriteRule(*this->RulesFileStream, "CLEAN", ninjaCmd() + " -t clean",

Source/cmGlobalNinjaGenerator.h

@@ -345,9 +345,14 @@ public:
   static std::string RequiredNinjaVersionForConsolePool() { return "1.5"; }
   static std::string RequiredNinjaVersionForImplicitOuts() { return "1.7"; }
   static std::string RequiredNinjaVersionForManifestRestat() { return "1.8"; }
+  static std::string RequiredNinjaVersionForMultilineDepfile()
+  {
+    return "1.9";
+  }
   bool SupportsConsolePool() const;
   bool SupportsImplicitOuts() const;
   bool SupportsManifestRestat() const;
+  bool SupportsMultilineDepfile() const;
 
   std::string NinjaOutputPath(std::string const& path) const;
   bool HasOutputPathPrefix() const { return !this->OutputPathPrefix.empty(); }
@@ -461,6 +466,7 @@ private:
   bool NinjaSupportsConsolePool;
   bool NinjaSupportsImplicitOuts;
   bool NinjaSupportsManifestRestat;
+  bool NinjaSupportsMultilineDepfile;
   unsigned long NinjaSupportsDyndeps;
 
 private: