Add support for creating prebuilt Android.mk files

Add options to the `install()` and `export()` commands to export the
targets we build into Android.mk files that reference them as prebuilt
libraries with associated usage requirements (compile definitions,
include directories, link libraries).  This will allow CMake-built
projects to be imported into projects using the Android NDK build
system.

Closes: #15562

1 files changed, 68 insertions, 0 deletions

diff --git a/Source/cmExportBuildAndroidMKGenerator.h b/Source/cmExportBuildAndroidMKGenerator.h
new file mode 100644
index 0000000000..e26aba0612
--- /dev/null
+++ b/Source/cmExportBuildAndroidMKGenerator.h
@@ -0,0 +1,68 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmExportBuildAndroidMKGenerator_h
+#define cmExportBuildAndroidMKGenerator_h
+
+#include "cmExportBuildFileGenerator.h"
+#include "cmListFileCache.h"
+
+class cmExportSet;
+
+/** \class cmExportBuildAndroidMKGenerator
+ * \brief Generate a file exporting targets from a build tree.
+ *
+ * cmExportBuildAndroidMKGenerator generates a file exporting targets from
+ * a build tree.  This exports the targets to the Android ndk build tool
+ * makefile format for prebuilt libraries.
+ *
+ * This is used to implement the EXPORT() command.
+ */
+class cmExportBuildAndroidMKGenerator : public cmExportBuildFileGenerator
+{
+public:
+  cmExportBuildAndroidMKGenerator();
+  // this is so cmExportInstallAndroidMKGenerator can share this
+  // function as they are almost the same
+  enum GenerateType
+  {
+    BUILD,
+    INSTALL
+  };
+  static void GenerateInterfaceProperties(cmGeneratorTarget const* target,
+                                          std::ostream& os,
+                                          const ImportPropertyMap& properties,
+                                          GenerateType type,
+                                          std::string const& config);
+
+protected:
+  // Implement virtual methods from the superclass.
+  virtual void GeneratePolicyHeaderCode(std::ostream&) {}
+  virtual void GeneratePolicyFooterCode(std::ostream&) {}
+  virtual void GenerateImportHeaderCode(std::ostream& os,
+                                        const std::string& config = "");
+  virtual void GenerateImportFooterCode(std::ostream& os);
+  virtual void GenerateImportTargetCode(std::ostream& os,
+                                        const cmGeneratorTarget* target);
+  virtual void GenerateExpectedTargetsCode(std::ostream& os,
+                                           const std::string& expectedTargets);
+  virtual void GenerateImportPropertyCode(std::ostream& os,
+                                          const std::string& config,
+                                          cmGeneratorTarget const* target,
+                                          ImportPropertyMap const& properties);
+  virtual void GenerateMissingTargetsCheckCode(
+    std::ostream& os, const std::vector<std::string>& missingTargets);
+  virtual void GenerateInterfaceProperties(
+    cmGeneratorTarget const* target, std::ostream& os,
+    const ImportPropertyMap& properties);
+};
+
+#endif