From ccb9dbd3f78d9f06826560bd54519bab3477947a Mon Sep 17 00:00:00 2001
From: Alexey Gavrilov <alexey.gavrilov@mail.com>
Date: Thu, 23 Jul 2026 14:37:44 +0700
Subject: 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>
---
 cmake/module/dexport.cmake | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 cmake/module/dexport.cmake

(limited to 'cmake/module/dexport.cmake')

diff --git a/cmake/module/dexport.cmake b/cmake/module/dexport.cmake
new file mode 100644
index 0000000..6ab5146
--- /dev/null
+++ b/cmake/module/dexport.cmake
@@ -0,0 +1,46 @@
+#[[
+ # Copyright (c) 2026 Alexey Gavrilov <alexey.gavrilov@mail.com>
+ #
+ # This file is part of ObjectiveOS.
+ #
+ # ObjectiveOS is free software: you can redistribute it and/or modify it under
+ # the terms of the GNU General Public License as published by the Free Software
+ # Foundation, either version 3 of the License, or (at your option) any later
+ # version.
+ #
+ # ObjectiveOS is distributed in the hope that it will be useful, but WITHOUT ANY
+ # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ #
+ # You should have received a copy of the GNU General Public License along with
+ # ObjectiveOS. If not, see <https://www.gnu.org/licenses/>.
+ ]]
+
+include_guard(GLOBAL)
+
+set(CONFFILE_NAME "CMakeDexport.txt" CACHE STRING "Build configuration
+file contains cmake run command to reproduce last run")
+
+macro(convertCacheVarIntoArg var cachelist outfile)
+    if("${var}" IN_LIST ${cachelist} AND DEFINED "${var}")
+        file(APPEND ${${outfile}} " -D${var}=${${var}}")
+    endif()
+endmacro()
+
+macro(parseFeatures vars outfile)
+    # Make copy of cache variables
+    set(FEATURE_CACHE_VARS ${${vars}})
+    # Stay only features enumeration
+    list(FILTER FEATURE_CACHE_VARS INCLUDE REGEX "FEATURE_[A-Za-z0-9\.]+$")
+
+    foreach(FEATURE_VAR IN LISTS FEATURE_CACHE_VARS)
+        convertCacheVarIntoArg("${FEATURE_VAR}" ${vars} ${outfile})
+    endforeach()
+endmacro()
+
+function(definesFileExport)
+    cmake_path(APPEND OUTFILE "${CMAKE_BINARY_DIR}" "${CONFFILE_NAME}")
+
+    get_directory_property(cacheVars CACHE_VARIABLES)
+
+    parseFeatures(cacheVars OUTFILE)
+endfunction()
-- 
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