Include cmake feature module in the build routine

Add predicate `ifFeatureEnables` that checks feature is define or not,
and return accordingly boolean value.

Consider some cmake objective targets as features. Populate information
to these targets, and provides in particular file `CMakeFeatures.txt`.
Cpuid, MSR, ACPI and driver VGA in text mode they are.

Signed-off-by: Alexey Gavrilov <alexey.gavrilov@mail.com>

1 files changed, 35 insertions, 12 deletions

diff --git a/arch/x86/msr/CMakeLists.txt b/arch/x86/msr/CMakeLists.txt
index 3f4fd8a..47112dd 100644
--- a/arch/x86/msr/CMakeLists.txt
+++ b/arch/x86/msr/CMakeLists.txt
@@ -16,18 +16,41 @@
  * ObjectiveOS. If not, see <https://www.gnu.org/licenses/>. 
  ]]
 
-add_library(MSR STATIC)
-target_link_libraries(MSR PUBLIC CXX_COMPILER_REQUIREMENTS)
+set(IS_MSR_DEFINES TRUE)
+ifFeatureEnables(MSR IS_MSR_DEFINES)
 
-target_sources(MSR PRIVATE
-    ${CMAKE_CURRENT_LIST_DIR}/Msr.cpp
-)
+if(NOT IS_MSR_DEFINES)
+    add_library(MSR INTERFACE)
+else()
+    target_compile_definitions(CXX_COMPILER_REQUIREMENTS INTERFACE
+        FEATRUE_MSR
+    )
 
-target_sources(MSR
-    PUBLIC
-    FILE_SET HEADERS
-        FILES
-        ${CMAKE_CURRENT_LIST_DIR}/Msr.h
-)
+    add_library(MSR STATIC)
+    target_link_libraries(MSR PUBLIC CXX_COMPILER_REQUIREMENTS)
 
-target_link_libraries(Architecture INTERFACE MSR)
+    target_sources(MSR PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}/Msr.cpp
+    )
+
+    target_sources(MSR
+        PUBLIC
+        FILE_SET HEADERS
+            FILES
+            ${CMAKE_CURRENT_LIST_DIR}/Msr.h
+    )
+
+    target_link_libraries(Architecture INTERFACE MSR)
+endif()
+
+startFeatureRecording(MSR)
+
+setFeatureField(NAME "MSR register extension")
+setFeatureField(HASHCOMMIT "515a11b818e4140845f69bb26a19d270a9e42178")
+setFeatureField(DESCRIPTION "This feature makes available to use"
+    "the x86 MSR register")
+setFeatureField(TAGS "NEW")
+setFeatureField(AUTHORSHIP "Alexey Gavrilov <alexey.gavrilov@mail.com>")
+setFeatureDependencies("x86;CPUID")
+
+saveFeaturerecording()