From f8729ab3667c695a734df0164cca692393bb6810 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Fri, 17 Nov 2023 22:51:47 -0500
Subject: cmLocalUnixMakefileGenerator3: handle object-referencing Fortran
 modules

Targets only using Fortran modules via `$<TARGET_OBJECTS>` also need a
collation step to be performed. Check for this case and trigger the
depends rule to be used.
---
 Source/cmLocalUnixMakefileGenerator3.cxx | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index e26a6ea..7bce1d2 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -1899,6 +1899,11 @@ void cmLocalUnixMakefileGenerator3::WriteDependLanguageInfo(
                         : "OFF")
                   << ")\n\n";
 
+  bool requireFortran = false;
+  if (target->HaveFortranSources(this->GetConfigName())) {
+    requireFortran = true;
+  }
+
   auto const& implicitLangs =
     this->GetImplicitDepends(target, cmDependencyScannerKind::CMake);
 
@@ -1908,6 +1913,12 @@ void cmLocalUnixMakefileGenerator3::WriteDependLanguageInfo(
   cmakefileStream << "set(CMAKE_DEPENDS_LANGUAGES\n";
   for (auto const& implicitLang : implicitLangs) {
     cmakefileStream << "  \"" << implicitLang.first << "\"\n";
+    if (requireFortran && implicitLang.first == "Fortran"_s) {
+      requireFortran = false;
+    }
+  }
+  if (requireFortran) {
+    cmakefileStream << "  \"Fortran\"\n";
   }
   cmakefileStream << "  )\n";
 
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