From 324988a6b101f29d148badc32b44964aedae1163 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 2 Oct 2019 13:57:12 -0400
Subject: cmGeneratorTarget: Add GetAllConfigCompileLanguages method

Return all languages needed to compile sources in the target in
any configuration.
---
 Source/cmGeneratorTarget.cxx | 13 +++++++++++++
 Source/cmGeneratorTarget.h   |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 949d9d9..0cc70c7 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -1670,6 +1670,19 @@ void cmGeneratorTarget::ComputeAllConfigSources() const
   }
 }
 
+std::set<std::string> cmGeneratorTarget::GetAllConfigCompileLanguages() const
+{
+  std::set<std::string> languages;
+  std::vector<AllConfigSource> const& sources = this->GetAllConfigSources();
+  for (AllConfigSource const& si : sources) {
+    std::string const& lang = si.Source->GetOrDetermineLanguage();
+    if (!lang.empty()) {
+      languages.emplace(lang);
+    }
+  }
+  return languages;
+}
+
 std::string cmGeneratorTarget::GetCompilePDBName(
   const std::string& config) const
 {
diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index c2811b2..4623513 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h
@@ -132,6 +132,10 @@ public:
       per-source configurations assigned.  */
   std::vector<AllConfigSource> const& GetAllConfigSources() const;
 
+  /** Get all languages used to compile sources in any configuration.
+      This excludes the languages of objects from object libraries.  */
+  std::set<std::string> GetAllConfigCompileLanguages() const;
+
   void GetObjectSources(std::vector<cmSourceFile const*>&,
                         const std::string& config) const;
   const std::string& GetObjectName(cmSourceFile const* file);
-- 
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