From a57d1bb7122be79101cc17a4b8a04bd0ac5a041e Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 21 Sep 2016 14:38:49 -0400
Subject: Ninja: Add API to check for dyndep support

Kitware maintains a branch of Ninja with support for dynamically
discovered dependencies (dyndep) that has not yet been accepted
upstream.  Add an internal API to check whether the Ninja version in use
for the build supports this feature.
---
 Source/cmGlobalNinjaGenerator.cxx | 11 +++++++++++
 Source/cmGlobalNinjaGenerator.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index 77693fe..42ce622 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -475,6 +475,7 @@ cmGlobalNinjaGenerator::cmGlobalNinjaGenerator(cmake* cm)
   , PolicyCMP0058(cmPolicies::WARN)
   , NinjaSupportsConsolePool(false)
   , NinjaSupportsImplicitOuts(false)
+  , NinjaSupportsDyndeps(0)
 {
 #ifdef _WIN32
   cm->GetState()->SetWindowsShell(true);
@@ -572,6 +573,16 @@ void cmGlobalNinjaGenerator::CheckNinjaFeatures()
   this->NinjaSupportsImplicitOuts = !cmSystemTools::VersionCompare(
     cmSystemTools::OP_LESS, this->NinjaVersion.c_str(),
     this->RequiredNinjaVersionForImplicitOuts().c_str());
+  {
+    // Our ninja branch adds ".dyndep-#" to its version number,
+    // where '#' is a feature-specific version number.  Extract it.
+    static std::string const k_DYNDEP_ = ".dyndep-";
+    std::string::size_type pos = this->NinjaVersion.find(k_DYNDEP_);
+    if (pos != std::string::npos) {
+      const char* fv = this->NinjaVersion.c_str() + pos + k_DYNDEP_.size();
+      cmSystemTools::StringToULong(fv, &this->NinjaSupportsDyndeps);
+    }
+  }
 }
 
 bool cmGlobalNinjaGenerator::CheckLanguages(
diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 5c7d8fa..0183952 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -444,6 +444,7 @@ private:
   std::string NinjaVersion;
   bool NinjaSupportsConsolePool;
   bool NinjaSupportsImplicitOuts;
+  unsigned long NinjaSupportsDyndeps;
 
 private:
   void InitOutputPathPrefix();
-- 
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