From 6ffe96d1e3f0289c2070e050cf8e1a30288e6d91 Mon Sep 17 00:00:00 2001
From: Alexey Gavrilov <alexey.gavrilov@mail.com>
Date: Fri, 27 Mar 2026 14:03:55 +0700
Subject: Cmake build generator support: build stage

Multi-target architecture implementation:
    each root source code directory presents the one
    *INTERFACE* target to it's subdirectory subtargets
    that link only as *STATIC* library.
    For instance, *arch* directory presents *Architecture* target
    then *Architecture* target has *CPUID*, *IO*, *PORT*
    and etc. dependencies

Exact order of linking targets is: boot.o CRTIBUNDLE <TARGETS> CRTNBUNDLE.
Sequence destruction cause to UB. Please to pay attention to this.

TODO
- Debug information
- Build type
- Toolchain file
- Image creation
- Build by WinGW compiler on Windows platform (optional)

Signed-off-by: Alexey Gavrilov <alexey.gavrilov@mail.com>
---
 libgcc/CMakeLists.txt     | 25 +++++++++++++++++++++++++
 libgcc/x86/CMakeLists.txt | 15 +++++++++++++++
 libgcc/x86/crti.nasm      |  5 +++++
 libgcc/x86/crti.s         |  5 -----
 libgcc/x86/crtn.nasm      |  3 +++
 libgcc/x86/crtn.s         |  3 ---
 6 files changed, 48 insertions(+), 8 deletions(-)
 create mode 100644 libgcc/CMakeLists.txt
 create mode 100644 libgcc/x86/CMakeLists.txt
 create mode 100644 libgcc/x86/crti.nasm
 delete mode 100644 libgcc/x86/crti.s
 create mode 100644 libgcc/x86/crtn.nasm
 delete mode 100644 libgcc/x86/crtn.s

(limited to 'libgcc')

diff --git a/libgcc/CMakeLists.txt b/libgcc/CMakeLists.txt
new file mode 100644
index 0000000..b5b2abc
--- /dev/null
+++ b/libgcc/CMakeLists.txt
@@ -0,0 +1,25 @@
+macro(setup_crt_object_file object_file target_name)
+    execute_process(
+        COMMAND ${CMAKE_CXX_COMPILER} --print-file-name=${object_file}
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE PATH
+        ERROR_VARIABLE ERROR_MESSAGE
+        RESULT_VARIABLE RESULT
+    )
+
+    if(RESULT)
+        message(FATAL_ERROR ${ERROR_MESSAGE})
+    endif()
+
+    add_library(${target_name} OBJECT IMPORTED GLOBAL)
+    set_target_properties(${target_name} PROPERTIES
+        IMPORTED_OBJECTS ${PATH}
+    )
+
+endmacro()
+
+# TODO: set platform specific CRT objects
+setup_crt_object_file(crtbegin.o CRTBEGIN)
+setup_crt_object_file(crtend.o CRTEND)
+
+add_subdirectory(${ARCH})
diff --git a/libgcc/x86/CMakeLists.txt b/libgcc/x86/CMakeLists.txt
new file mode 100644
index 0000000..2a1bec9
--- /dev/null
+++ b/libgcc/x86/CMakeLists.txt
@@ -0,0 +1,15 @@
+add_library(CRTI INTERFACE)
+add_library(CRTIBUNDLE STATIC)
+target_sources(CRTIBUNDLE PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR}/crti.nasm
+    $<TARGET_OBJECTS:CRTBEGIN>
+)
+target_link_libraries(CRTI INTERFACE CRTIBUNDLE)
+
+add_library(CRTN INTERFACE)
+add_library(CRTNBUNDLE STATIC)
+target_sources(CRTNBUNDLE PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR}/crtn.nasm
+    $<TARGET_OBJECTS:CRTEND>
+)
+target_link_libraries(CRTN INTERFACE CRTNBUNDLE)
diff --git a/libgcc/x86/crti.nasm b/libgcc/x86/crti.nasm
new file mode 100644
index 0000000..57cb8c1
--- /dev/null
+++ b/libgcc/x86/crti.nasm
@@ -0,0 +1,5 @@
+section .init
+global _init:function
+_init:
+            push ebp
+            mov ebp, esp
diff --git a/libgcc/x86/crti.s b/libgcc/x86/crti.s
deleted file mode 100644
index 57cb8c1..0000000
--- a/libgcc/x86/crti.s
+++ /dev/null
@@ -1,5 +0,0 @@
-section .init
-global _init:function
-_init:
-            push ebp
-            mov ebp, esp
diff --git a/libgcc/x86/crtn.nasm b/libgcc/x86/crtn.nasm
new file mode 100644
index 0000000..537fa65
--- /dev/null
+++ b/libgcc/x86/crtn.nasm
@@ -0,0 +1,3 @@
+section .init
+            pop ebp
+            ret
diff --git a/libgcc/x86/crtn.s b/libgcc/x86/crtn.s
deleted file mode 100644
index 537fa65..0000000
--- a/libgcc/x86/crtn.s
+++ /dev/null
@@ -1,3 +0,0 @@
-section .init
-            pop ebp
-            ret
-- 
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