Export glslang targets on installation

This allows the targets to be used in other cmake projects. See the following for more details:
https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#creating-packages
https://foonathan.net/blog/2016/07/07/cmake-dependency-handling.html
diff --git a/OGLCompilersDLL/CMakeLists.txt b/OGLCompilersDLL/CMakeLists.txt
index 5bb3f0e..d257828 100644
--- a/OGLCompilersDLL/CMakeLists.txt
+++ b/OGLCompilersDLL/CMakeLists.txt
@@ -9,6 +9,7 @@
 endif(WIN32)
 
 if(ENABLE_GLSLANG_INSTALL)
-    install(TARGETS OGLCompiler
+    install(TARGETS OGLCompiler EXPORT OGLCompilerTargets
             ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+	install(EXPORT OGLCompilerTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 endif(ENABLE_GLSLANG_INSTALL)
diff --git a/SPIRV/CMakeLists.txt b/SPIRV/CMakeLists.txt
index 594ab1e..3ddf6f1 100644
--- a/SPIRV/CMakeLists.txt
+++ b/SPIRV/CMakeLists.txt
@@ -80,22 +80,25 @@
 if(ENABLE_GLSLANG_INSTALL)
     if(BUILD_SHARED_LIBS)
         if (ENABLE_SPVREMAPPER)
-            install(TARGETS SPVRemapper
+            install(TARGETS SPVRemapper EXPORT SPVRemapperTargets
                     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
         endif()
-        install(TARGETS SPIRV
+        install(TARGETS SPIRV EXPORT SPIRVTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
     else()
         if (ENABLE_SPVREMAPPER)
-            install(TARGETS SPVRemapper
+            install(TARGETS SPVRemapper EXPORT SPVRemapperTargets
                     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
         endif()
-        install(TARGETS SPIRV
+        install(TARGETS SPIRV EXPORT SPIRVTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif()
+	
+	install(EXPORT SPVRemapperTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
+	install(EXPORT SPIRVTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 
     install(FILES ${HEADERS} ${SPVREMAP_HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/SPIRV/)
 endif(ENABLE_GLSLANG_INSTALL)
diff --git a/StandAlone/CMakeLists.txt b/StandAlone/CMakeLists.txt
index 5cea53d..03d6401 100644
--- a/StandAlone/CMakeLists.txt
+++ b/StandAlone/CMakeLists.txt
@@ -40,14 +40,18 @@
 endif(WIN32)
 
 if(ENABLE_GLSLANG_INSTALL)
-    install(TARGETS glslangValidator
+    install(TARGETS glslangValidator EXPORT glslangValidatorTargets
             RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
-    install(TARGETS spirv-remap
+    install(TARGETS spirv-remap EXPORT spirv-remapTargets
             RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+	
+	install(EXPORT glslangValidatorTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
+	install(EXPORT spirv-remapTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
             
     if(BUILD_SHARED_LIBS)
-        install(TARGETS glslang-default-resource-limits
+        install(TARGETS glslang-default-resource-limits EXPORT glslang-default-resource-limitsTargets
                 LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+		install(EXPORT glslang-default-resource-limitsTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
     endif()
 endif(ENABLE_GLSLANG_INSTALL)
diff --git a/glslang/CMakeLists.txt b/glslang/CMakeLists.txt
index 60169fb..9019d81 100644
--- a/glslang/CMakeLists.txt
+++ b/glslang/CMakeLists.txt
@@ -106,14 +106,15 @@
 
 if(ENABLE_GLSLANG_INSTALL)
     if(BUILD_SHARED_LIBS)
-        install(TARGETS glslang
+        install(TARGETS glslang EXPORT glslangTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
     else()
-        install(TARGETS glslang
+        install(TARGETS glslang EXPORT glslangTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif()
+	install(EXPORT glslangTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 endif(ENABLE_GLSLANG_INSTALL)
 
 if(ENABLE_GLSLANG_INSTALL)
diff --git a/glslang/OSDependent/Unix/CMakeLists.txt b/glslang/OSDependent/Unix/CMakeLists.txt
index e652f45..4a434ef 100644
--- a/glslang/OSDependent/Unix/CMakeLists.txt
+++ b/glslang/OSDependent/Unix/CMakeLists.txt
@@ -20,6 +20,7 @@
 endif()
 
 if(ENABLE_GLSLANG_INSTALL)
-    install(TARGETS OSDependent
+    install(TARGETS OSDependent EXPORT OSDependentTargets
             ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+	install(EXPORT OSDependentTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 endif(ENABLE_GLSLANG_INSTALL)
diff --git a/glslang/OSDependent/Windows/CMakeLists.txt b/glslang/OSDependent/Windows/CMakeLists.txt
index f257418..321fd4f 100644
--- a/glslang/OSDependent/Windows/CMakeLists.txt
+++ b/glslang/OSDependent/Windows/CMakeLists.txt
@@ -15,6 +15,7 @@
 endif(WIN32)
 
 if(ENABLE_GLSLANG_INSTALL)
-    install(TARGETS OSDependent
+    install(TARGETS OSDependent EXPORT OSDependentTargets
             ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+	install(EXPORT OSDependentTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 endif(ENABLE_GLSLANG_INSTALL)
diff --git a/gtests/CMakeLists.txt b/gtests/CMakeLists.txt
index f678cb6..6e57443 100644
--- a/gtests/CMakeLists.txt
+++ b/gtests/CMakeLists.txt
@@ -31,8 +31,9 @@
         set_property(TARGET glslangtests PROPERTY FOLDER tests)
         glslang_set_link_args(glslangtests)
         if(ENABLE_GLSLANG_INSTALL)
-            install(TARGETS glslangtests
+            install(TARGETS glslangtests EXPORT glslangtestsTargets
                     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+			install(EXPORT glslangtestsTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
         endif(ENABLE_GLSLANG_INSTALL)
 
         set(GLSLANG_TEST_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/../Test")
diff --git a/hlsl/CMakeLists.txt b/hlsl/CMakeLists.txt
index 7436dde..70cd28e 100644
--- a/hlsl/CMakeLists.txt
+++ b/hlsl/CMakeLists.txt
@@ -33,12 +33,13 @@
 
 if(ENABLE_GLSLANG_INSTALL)
     if(BUILD_SHARED_LIBS)
-        install(TARGETS HLSL
+        install(TARGETS HLSL EXPORT HLSLTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                 RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
     else()
-        install(TARGETS HLSL
+        install(TARGETS HLSL EXPORT HLSLTargets
                 ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
     endif()
+	install(EXPORT HLSLTargets DESTINATION ${LIB_INSTALL_DIR}/cmake)
 endif(ENABLE_GLSLANG_INSTALL)