Added target for userspace stdlib.

targets/_any/stdlib/SConscript

@@ -1,13 +1,37 @@
 
 Import('env')
 
-stdlib_sources = Split('''
+shared_sources = Split('''
     src/assert.cpp
     src/stdio.cpp
     src/stdlib.cpp
     src/string.cpp
 ''')
 
-env.Append(KERNEL_SOURCES = [env.File(f) for f in stdlib_sources])
+kernel_sources = shared_sources
+
+env.Append(KERNEL_SOURCES = [env.File(f) for f in kernel_sources])
+
+### Stdlib
+stdlib_env = env.Clone()
+stdlib_env['AS'] = 'x86_64-baos-elf-as'
+stdlib_env['CC'] = 'x86_64-baos-elf-gcc'
+stdlib_env['CXX'] = 'x86_64-baos-elf-g++'
+stdlib_env['LD'] = 'x86_64-baos-elf-g++'
+stdlib_env.Append(CXXFLAGS = ['-fno-exceptions', '-fno-rtti', '-std=c++20'])
+stdlib_env.Append(CPPPATH = ['#targets/_any/bastl/include', '#targets/_any/stdlib/include', '#targets/_any/kernel/include'])
+
+stdlib_sources = Split('''
+    src/crt0.s
+''')
+for src in shared_sources:
+    new_src = stdlib_env.File(f'#.stdlib_variant/{stdlib_env.File(src).name}').abspath
+    stdlib_env.Command(new_src, src, Copy("$TARGET", "$SOURCE"))
+    stdlib_sources.append(new_src)
+lib_stdlib = stdlib_env.StaticLibrary(
+    target = stdlib_env.File('#stdlib.a'),
+    source = stdlib_sources
+)
+stdlib_env.Default(lib_stdlib)
 
 Return('env')