4 files changed, 31 insertions, 0 deletions
diff --git a/Source/cmCoreTryCompile.cxx b/Source/cmCoreTryCompile.cxx
index a483fd1..137b25f 100644
--- a/Source/cmCoreTryCompile.cxx
+++ b/Source/cmCoreTryCompile.cxx
@@ -57,6 +57,12 @@ static std::string const kCMAKE_TRY_COMPILE_PLATFORM_VARIABLES =
   "CMAKE_TRY_COMPILE_PLATFORM_VARIABLES";
 static std::string const kCMAKE_WARN_DEPRECATED = "CMAKE_WARN_DEPRECATED";
 
+/* GHS Multi platform variables */
+static std::set<std::string> ghs_platform_vars{
+  "GHS_TARGET_PLATFORM", "GHS_PRIMARY_TARGET", "GHS_TOOLSET_ROOT",
+  "GHS_OS_ROOT",         "GHS_OS_DIR",         "GHS_BSP_NAME"
+};
+
 static void writeProperty(FILE* fout, std::string const& targetName,
                           std::string const& prop, std::string const& value)
 {
@@ -869,6 +875,16 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv,
     projectName = "CMAKE_TRY_COMPILE";
   }
 
+  if (this->Makefile->GetState()->UseGhsMultiIDE()) {
+    // Forward the GHS variables to the inner project cache.
+    for (std::string const& var : ghs_platform_vars) {
+      if (const char* val = this->Makefile->GetDefinition(var)) {
+        std::string flag = "-D" + var + "=" + val;
+        cmakeFlags.push_back(std::move(flag));
+      }
+    }
+  }
+
   bool erroroc = cmSystemTools::GetErrorOccuredFlag();
   cmSystemTools::ResetErrorOccuredFlag();
   std::string output;
diff --git a/Source/cmGlobalGhsMultiGenerator.cxx b/Source/cmGlobalGhsMultiGenerator.cxx
index 25a4d21..82543e7 100644
--- a/Source/cmGlobalGhsMultiGenerator.cxx
+++ b/Source/cmGlobalGhsMultiGenerator.cxx
@@ -11,6 +11,7 @@
 #include "cmGhsMultiTargetGenerator.h"
 #include "cmLocalGhsMultiGenerator.h"
 #include "cmMakefile.h"
+#include "cmState.h"
 #include "cmVersion.h"
 #include "cmake.h"
 
@@ -21,6 +22,7 @@ const char* cmGlobalGhsMultiGenerator::DEFAULT_TOOLSET_ROOT = "C:/ghs";
 cmGlobalGhsMultiGenerator::cmGlobalGhsMultiGenerator(cmake* cm)
   : cmGlobalGenerator(cm)
 {
+  cm->GetState()->SetGhsMultiIDE(true);
 }
 
 cmGlobalGhsMultiGenerator::~cmGlobalGhsMultiGenerator()
diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index f664000..94a84e5 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -593,6 +593,16 @@ bool cmState::UseWindowsVSIDE() const
   return this->WindowsVSIDE;
 }
 
+void cmState::SetGhsMultiIDE(bool ghsMultiIDE)
+{
+  this->GhsMultiIDE = ghsMultiIDE;
+}
+
+bool cmState::UseGhsMultiIDE() const
+{
+  return this->GhsMultiIDE;
+}
+
 void cmState::SetWatcomWMake(bool watcomWMake)
 {
   this->WatcomWMake = watcomWMake;
diff --git a/Source/cmState.h b/Source/cmState.h
index abe93ed..b60eece 100644
--- a/Source/cmState.h
+++ b/Source/cmState.h
@@ -154,6 +154,8 @@ public:
   bool UseWindowsShell() const;
   void SetWindowsVSIDE(bool windowsVSIDE);
   bool UseWindowsVSIDE() const;
+  void SetGhsMultiIDE(bool ghsMultiIDE);
+  bool UseGhsMultiIDE() const;
   void SetWatcomWMake(bool watcomWMake);
   bool UseWatcomWMake() const;
   void SetMinGWMake(bool minGWMake);
@@ -206,6 +208,7 @@ private:
   bool IsGeneratorMultiConfig = false;
   bool WindowsShell = false;
   bool WindowsVSIDE = false;
+  bool GhsMultiIDE = false;
   bool WatcomWMake = false;
   bool MinGWMake = false;
   bool NMake = false;