Cmake status information output

Reinforce of compiler, C runtime, architecture checks at cmake
    configuration.

Compiler check means continue building at the cmake configure
    stage only for supported compilers. Use unsupported compiler
    involves immediate build process stopping.

C runtime check means finding of runtime objects. Especially for
    *crtbegin.o* and *crtend.o* files.

Architecture means *ObjectiveProject_ARCHITECTURE* variable is set.
    That variable configure at toolchain file by default and cannot
    override if toolchain file is passed.

    TODO
    - Image creation
    - Build under window platform (optional)

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

5 files changed, 51 insertions, 13 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6d9912..d9e5643 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,12 +2,20 @@
 # which include farther subprojects source codes
 
 # Expected input variables:
-#   ARCH: type of architecture 
+#   ObjectiveProject_ARCHITECTURE: type of architecture 
 
 cmake_minimum_required(VERSION 3.25)
 
+list(APPEND CMAKE_MESSAGE_CONTEXT ObjectiveProject)
 project(ObjectiveProject LANGUAGES CXX ASM_NASM)
 
+# Check on supported compiler
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
+    message(STATUS "${CMAKE_CXX_COMPILER_ID} compiler is supported")
+else()
+    message(FATAL_ERROR "${CMAKE_CXX_COMPILER_ID} compiler isn't supported")
+endif()
+
 set(ObjectiveProject_CXX_FLAGS
     $<$<CONFIG:Debug>:-Wall -Wextra -ggdb -g3 -O0>
     $<$<CONFIG:Release>:-Wall -Werror>
@@ -36,11 +44,19 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 add_executable(Objective)
 
 # Set architecture by default if not present
-if(NOT ARCH IN_LIST OBJECTIVE_SUPPORTED_PROCESSORS)
-    list(GET OBJECTIVE_SUPPORTED_PROCESSORS 0 ARCH)
+if(NOT ObjectiveProject_ARCHITECTURE IN_LIST OBJECTIVE_SUPPORTED_PROCESSORS)
+    if(ObjectiveProject_ARCHITECTURE STREQUAL "" OR NOT DEFINED ObjectiveProject_ARCHITECTURE)
+        message(FATAL_ERROR "Architecture isn't set")
+    else()
+        message(FATAL_ERROR "${ObjectiveProject_ARCHITECTURE} - unknown architecture")
+    endif()
+    list(GET OBJECTIVE_SUPPORTED_PROCESSORS 0 ObjectiveProject_ARCHITECTURE)
+    message(STATUS "Set up architecture by default - ${ObjectiveProject_ARCHITECTURE}")
+else()
+    message(STATUS "${ObjectiveProject_ARCHITECTURE} - choosed architecture")
 endif()
 
-# Create target with compiler requirements (include directories, flags and etc)
+# Create targets with compilers requirements (include directories, flags and etc)
 add_library(CXX_COMPILER_REQUIREMENTS INTERFACE)
 add_library(ASM_NASM_COMPILER_REQUIREMENTS INTERFACE)
 
@@ -53,13 +69,12 @@ target_link_libraries(CXX_LINKER_REQUIREMENTS INTERFACE
     gcc
 )
 
-# Set compiler flags
-if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
-    target_compile_options(CXX_COMPILER_REQUIREMENTS INTERFACE
-        ${ObjectiveProject_CXX_FLAGS}
-    )
-endif()
+# Set cxx compiler flags
+target_compile_options(CXX_COMPILER_REQUIREMENTS INTERFACE
+    ${ObjectiveProject_CXX_FLAGS}
+)
 
+# Set nasm compiler flags
 target_compile_options(ASM_NASM_COMPILER_REQUIREMENTS INTERFACE
     ${ObjectiveProject_ASM_NASM_FLAGS}
 )
@@ -69,7 +84,7 @@ target_include_directories(CXX_COMPILER_REQUIREMENTS
         ${ObjectiveProject_SOURCE_DIR}/include
 )
 
-# Subscribe compiler requirements to Object executable
+# Subscribe compiler requirements to Objective executable
 target_link_libraries(Objective PUBLIC CXX_COMPILER_REQUIREMENTS)
 
 add_subdirectory(arch)
@@ -90,4 +105,20 @@ target_link_libraries(Objective PRIVATE
     CRTN
 )
 
+# Set cxx linker options
 target_link_libraries(Objective PRIVATE CXX_LINKER_REQUIREMENTS)
+
+# Targets to show output of generator expression
+add_custom_target(options
+    COMMENT "Toolset passed options"
+    COMMAND ${CMAKE_COMMAND} -E echo
+    "CXX compiler options: "
+    "$<JOIN:$<TARGET_PROPERTY:CXX_COMPILER_REQUIREMENTS,INTERFACE_COMPILE_OPTIONS>, >"
+    COMMAND ${CMAKE_COMMAND} -E echo
+    "NASM compiler options: "
+    "$<JOIN:$<TARGET_PROPERTY:ASM_NASM_COMPILER_REQUIREMENTS,INTERFACE_COMPILE_OPTIONS>, >"
+    COMMAND ${CMAKE_COMMAND} -E echo
+    "Linker options: "
+    "$<JOIN:$<TARGET_PROPERTY:CXX_LINKER_REQUIREMENTS,INTERFACE_LINK_OPTIONS>, >"
+    VERBATIM
+)
diff --git a/arch/CMakeLists.txt b/arch/CMakeLists.txt
index c8719ce..0491df7 100644
--- a/arch/CMakeLists.txt
+++ b/arch/CMakeLists.txt
@@ -14,4 +14,4 @@ target_sources(Initialization
             ${CMAKE_CURRENT_LIST_DIR}/SecondaryInit.h
 )
 
-add_subdirectory(${ARCH})
+add_subdirectory(${ObjectiveProject_ARCHITECTURE})
diff --git a/cmake/toolchain/x86_generic_clang.cmake b/cmake/toolchain/x86_generic_clang.cmake
index 696568e..23b3b80 100644
--- a/cmake/toolchain/x86_generic_clang.cmake
+++ b/cmake/toolchain/x86_generic_clang.cmake
@@ -1,6 +1,7 @@
 set(CMAKE_SYSTEM_NAME Generic)
 set(CMAKE_CROSSCOMPILING true)
 set(CMAKE_SYSTEM_PROCESSOR i686)
+set(ObjectiveProject_ARCHITECTURE x86)
 
 set(CMAKE_ASM_NASM_OBJECT_FORMAT elf32)
 
diff --git a/cmake/toolchain/x86_generic_gcc.cmake b/cmake/toolchain/x86_generic_gcc.cmake
index 8ea769e..a284bb3 100644
--- a/cmake/toolchain/x86_generic_gcc.cmake
+++ b/cmake/toolchain/x86_generic_gcc.cmake
@@ -1,6 +1,7 @@
 set(CMAKE_SYSTEM_NAME Generic)
 set(CMAKE_CROSSCOMPILING true)
 set(CMAKE_SYSTEM_PROCESSOR i686)
+set(ObjectiveProject_ARCHITECTURE x86)
 
 set(CMAKE_ASM_NASM_OBJECT_FORMAT elf32)
 
diff --git a/libgcc/CMakeLists.txt b/libgcc/CMakeLists.txt
index b5b2abc..6fd97b6 100644
--- a/libgcc/CMakeLists.txt
+++ b/libgcc/CMakeLists.txt
@@ -1,3 +1,6 @@
+list(APPEND CMAKE_MESSAGE_CONTEXT libgcc)
+message(STATUS "Searching CRT objects")
+
 macro(setup_crt_object_file object_file target_name)
     execute_process(
         COMMAND ${CMAKE_CXX_COMPILER} --print-file-name=${object_file}
@@ -11,6 +14,7 @@ macro(setup_crt_object_file object_file target_name)
         message(FATAL_ERROR ${ERROR_MESSAGE})
     endif()
 
+    message(STATUS "${object_file} was found at the ${PATH} path")
     add_library(${target_name} OBJECT IMPORTED GLOBAL)
     set_target_properties(${target_name} PROPERTIES
         IMPORTED_OBJECTS ${PATH}
@@ -22,4 +26,5 @@ endmacro()
 setup_crt_object_file(crtbegin.o CRTBEGIN)
 setup_crt_object_file(crtend.o CRTEND)
 
-add_subdirectory(${ARCH})
+message(STATUS "The CRT objects were found")
+add_subdirectory(${ObjectiveProject_ARCHITECTURE})