BuildSystem: cmake can now build out libc

I can't seem to get libc++ build to work...
This commit is contained in:
Bananymous 2023-04-07 02:27:15 +03:00
parent ac0b22f9b9
commit 9f977488fa
7 changed files with 81 additions and 11 deletions

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@ -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}/
)

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@ -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 ")

23
kernel/arch/i386/crt0.S Normal file
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@ -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

31
kernel/arch/x86_64/crt0.S Normal file
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@ -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

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@ -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 "")

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@ -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

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@ -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);