From ef91fb02f3658954b631e46858e254008ca58132 Mon Sep 17 00:00:00 2001
From: Kyle Edwards <kyle.edwards@kitware.com>
Date: Mon, 23 Nov 2020 14:20:08 -0500
Subject: cmGlobalGenerator: FindMakeProgram() at a generator-specific time

d5b5c192 moved FindMakeProgram() to an earlier time, which resulted
in CMAKE_MAKE_PROGRAM not being read from the toolchain file. Change
it to only call FindMakeProgram() early in the specific cases of
Visual Studio and Xcode, and restore the old behavior for all other
generators.

Fixes: #21486
---
 Source/cmGlobalGenerator.cxx           |  9 ++++++++-
 Source/cmGlobalGenerator.h             | 11 +++++++++++
 Source/cmGlobalVisualStudioGenerator.h |  5 +++++
 Source/cmGlobalXCodeGenerator.h        |  5 +++++
 4 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 1197db6..fc40d63 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -584,7 +584,8 @@ void cmGlobalGenerator::EnableLanguage(
     // Find the native build tool for this generator.
     // This has to be done early so that MSBuild can be used to examine the
     // cross-compilation environment.
-    if (!this->FindMakeProgram(mf)) {
+    if (this->GetFindMakeProgramStage() == FindMakeProgramStage::Early &&
+        !this->FindMakeProgram(mf)) {
       return;
     }
   }
@@ -660,6 +661,12 @@ void cmGlobalGenerator::EnableLanguage(
       cmSystemTools::SetFatalErrorOccured();
       return;
     }
+
+    // Find the native build tool for this generator.
+    if (this->GetFindMakeProgramStage() == FindMakeProgramStage::Late &&
+        !this->FindMakeProgram(mf)) {
+      return;
+    }
   }
 
   // Check that the languages are supported by the generator and its
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index b532a43..c106258 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -597,6 +597,17 @@ protected:
 
   std::string GetPredefinedTargetsFolder();
 
+  enum class FindMakeProgramStage
+  {
+    Early,
+    Late,
+  };
+
+  virtual FindMakeProgramStage GetFindMakeProgramStage() const
+  {
+    return FindMakeProgramStage::Late;
+  }
+
 private:
   using TargetMap = std::unordered_map<std::string, cmTarget*>;
   using GeneratorTargetMap =
diff --git a/Source/cmGlobalVisualStudioGenerator.h b/Source/cmGlobalVisualStudioGenerator.h
index 3c46408..3bfcbd0 100644
--- a/Source/cmGlobalVisualStudioGenerator.h
+++ b/Source/cmGlobalVisualStudioGenerator.h
@@ -166,6 +166,11 @@ protected:
 
   void WriteSLNHeader(std::ostream& fout);
 
+  FindMakeProgramStage GetFindMakeProgramStage() const override
+  {
+    return FindMakeProgramStage::Early;
+  }
+
   bool ComputeTargetDepends() override;
   class VSDependSet : public std::set<std::string>
   {
diff --git a/Source/cmGlobalXCodeGenerator.h b/Source/cmGlobalXCodeGenerator.h
index 5b05214..ab5eeb2 100644
--- a/Source/cmGlobalXCodeGenerator.h
+++ b/Source/cmGlobalXCodeGenerator.h
@@ -124,6 +124,11 @@ protected:
   void AddExtraIDETargets() override;
   void Generate() override;
 
+  FindMakeProgramStage GetFindMakeProgramStage() const override
+  {
+    return FindMakeProgramStage::Early;
+  }
+
 private:
   bool ParseGeneratorToolset(std::string const& ts, cmMakefile* mf);
   bool ProcessGeneratorToolsetField(std::string const& key,
-- 
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