BuildSystem: cmake can now build out libc

I can't seem to get libc++ build to work...

CMakeLists.txt

@@ -21,6 +21,7 @@ project(banan-os CXX)
 
 set(BANAN_SYSROOT ${CMAKE_BINARY_DIR}/sysroot)
 set(BANAN_INCLUDE ${BANAN_SYSROOT}/usr/include)
+set(BANAN_LIB ${BANAN_SYSROOT}/usr/lib)
 set(BANAN_BOOT ${BANAN_SYSROOT}/boot)
 set(DISK_IMAGE_PATH ${CMAKE_BINARY_DIR}/banan-os.img)
 
@@ -30,8 +31,9 @@ add_subdirectory(libc)
 
 add_custom_target(sysroot
 	COMMAND mkdir -p ${BANAN_SYSROOT}
-	COMMAND mkdir -p ${BANAN_BOOT}
 	COMMAND mkdir -p ${BANAN_INCLUDE}
+	COMMAND mkdir -p ${BANAN_LIB}
+	COMMAND mkdir -p ${BANAN_BOOT}
 	COMMAND cp -r ${CMAKE_SOURCE_DIR}/base/* ${BANAN_SYSROOT}/
 )
 

kernel/CMakeLists.txt

@@ -120,6 +120,11 @@ endif()
 
 target_link_options(kernel PUBLIC -ffreestanding -nostdlib -O2)
 
+add_custom_target(crt0
+	COMMAND ${CMAKE_CXX_COMPILER} -c ${CMAKE_CURRENT_SOURCE_DIR}/arch/${BANAN_ARCH}/crt0.S -o ${BANAN_LIB}/crt0.o
+	DEPENDS headers
+)
+
 add_custom_target(kernel-headers
 	COMMAND cp -r ${CMAKE_CURRENT_SOURCE_DIR}/include/* ${BANAN_INCLUDE}/
 	DEPENDS sysroot
@@ -148,4 +153,3 @@ add_custom_command(
 )
 
 set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_COMPILER} <CMAKE_CXX_LINK_FLAGS> <FLAGS> <LINK_FLAGS> -o <TARGET> ${CMAKE_CURRENT_BINARY_DIR}/crti.o ${CMAKE_CURRENT_BINARY_DIR}/crtbegin.o <OBJECTS> ${CMAKE_CURRENT_BINARY_DIR}/crtend.o ${CMAKE_CURRENT_BINARY_DIR}/crtn.o -lgcc ")
-

kernel/arch/i386/crt0.S

@@ -0,0 +1,23 @@
+.section .text
+
+.global _start
+_start:
+	# Set up end of the stack frame linked list.
+	movl $0, %ebp
+	pushl %ebp # rip=0
+	pushl %ebp # rbp=0
+	movl %esp, %ebp
+
+	# Prepare signals, memory allocation, stdio and such.
+	call initialize_standard_library
+
+	# Run the global constructors.
+	call _init
+
+	# Run main
+	call main
+
+	# Terminate the process with the exit code.
+	movl %eax, %edi
+	call exit
+.size _start, . - _start

kernel/arch/x86_64/crt0.S

@@ -0,0 +1,31 @@
+.section .text
+
+.global _start
+_start:
+	# Set up end of the stack frame linked list.
+	movq $0, %rbp
+	pushq %rbp # rip=0
+	pushq %rbp # rbp=0
+	movq %rsp, %rbp
+
+	# We need those in a moment when we call main.
+	pushq %rsi
+	pushq %rdi
+
+	# Prepare signals, memory allocation, stdio and such.
+	call initialize_standard_library
+
+	# Run the global constructors.
+	call _init
+
+	# Restore argc and argv.
+	popq %rdi
+	popq %rsi
+
+	# Run main
+	call main
+
+	# Terminate the process with the exit code.
+	movl %eax, %edi
+	call exit
+.size _start, . - _start

libc/CMakeLists.txt

@@ -2,12 +2,25 @@ cmake_minimum_required(VERSION 3.26)
 
 project(libc CXX)
 
+set(LIBC_SOURCES
+	ctype.cpp
+	stdio.cpp
+	stdlib.cpp
+	string.cpp
+	unistd.cpp
+)
+
 add_custom_target(libc-headers
 	COMMAND cp -r ${CMAKE_CURRENT_SOURCE_DIR}/include/* ${BANAN_INCLUDE}
 	DEPENDS sysroot
 )
 
+add_library(libc ${LIBC_SOURCES})
+add_dependencies(libc crt0)
+
 add_custom_target(libc-install
-	DEPENDS libc-headers
+	COMMAND cp ${CMAKE_CURRENT_BINARY_DIR}/libc.a ${BANAN_LIB}/
+	DEPENDS libc
 )
 
+set(CMAKE_STATIC_LIBRARY_PREFIX "")

toolchain/build.sh

@@ -43,7 +43,6 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-ld ]; then
 		--target="$TARGET" \
 		--prefix="$PREFIX" \
 		--with-sysroot="$SYSROOT" \
-		--enable-shared \
 		--disable-werror
 
 	make -j $(nproc)
@@ -73,7 +72,6 @@ if [ ! -f ${PREFIX}/bin/${TARGET}-g++ ]; then
 		--target="$TARGET" \
 		--prefix="$PREFIX" \
 		--with-sysroot="$SYSROOT" \
-		--enable-shared \
 		--enable-languages=c,c++
 
 	make -j $(nproc) all-gcc all-target-libgcc

toolchain/gcc-12.2.0.patch

@@ -1,4 +1,4 @@
-diff -ruN gcc-12.2.0/config.sub gcc-12.2.0-banan/config.sub
+/diff -ruN gcc-12.2.0/config.sub gcc-12.2.0-banan/config.sub
 --- gcc-12.2.0/config.sub	2022-08-19 11:09:52.128656687 +0300
 +++ gcc-12.2.0-banan/config.sub	2023-04-05 21:48:39.434844559 +0300
 @@ -1749,7 +1749,7 @@
@@ -25,7 +25,7 @@ diff -ruN gcc-12.2.0/fixincludes/mkfixinc.sh gcc-12.2.0-banan/fixincludes/mkfixi
 diff -ruN gcc-12.2.0/gcc/config/banan_os.h gcc-12.2.0-banan/gcc/config/banan_os.h
 --- gcc-12.2.0/gcc/config/banan_os.h	1970-01-01 02:00:00.000000000 +0200
 +++ gcc-12.2.0-banan/gcc/config/banan_os.h	2023-04-05 22:03:20.133753757 +0300
-@@ -0,0 +1,32 @@
+@@ -0,0 +1,31 @@
 +/* Useful if you wish to make target-specific GCC changes. */
 +#undef TARGET_BANAN_OS
 +#define TARGET_BANAN_OS 1
@@ -44,9 +44,8 @@ diff -ruN gcc-12.2.0/gcc/config/banan_os.h gcc-12.2.0-banan/gcc/config/banan_os.
 +#undef ENDFILE_SPEC
 +#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
 +
-+/* Linker struff */
-+#undef LINK_SPEC
-+#define LINK_SPEC "%{shared:-shared} %{static:-static} %{!shared: %{!static: %{rdynamic:-export-dynamic}}} -z max-page-size=4096"
++/* Don't use separate math library */
++#define MATH_LIBRARY ""
 +
 +/* Additional predefined macros. */
 +#undef TARGET_OS_CPP_BUILTINS
@@ -54,7 +53,7 @@ diff -ruN gcc-12.2.0/gcc/config/banan_os.h gcc-12.2.0-banan/gcc/config/banan_os.
 +  do {                                \
 +    builtin_define ("__banan_os__");      \
 +    builtin_define ("__unix__");      \
-+    builtin_assert ("system=myos");   \
++    builtin_assert ("system=banan_os");   \
 +    builtin_assert ("system=unix");   \
 +    builtin_assert ("system=posix");   \
 +  } while(0);