Global initialization of C++ static objects

I *think* I have this working right...?

src/Console.cc

@@ -10,6 +10,16 @@
 
 namespace kernel {
 
+/*
+ * TODO: The build currently complains about missing __cxa_guard_acquire and
+ * __cxa_guard_release symbols if I add it there though. Once I've written
+ * those, this can be moved Console::systemConsole().
+ *
+ * See http://wiki.osdev.org/C%2B%2B for details.
+ */
+static Console sSystemConsole;
+
+
 /** Create a VGA color pair. */
 static inline uint8_t
 makeVGAColor(Console::Color fg,
@@ -29,7 +39,21 @@ makeVGAEntry(char c,
     return c16 | color16 << 8;
 }
 
+/*
+ * Static
+ */
 
+auto
+Console::systemConsole() -> Console&
+{
+    return sSystemConsole;
+}
+
+/*
+ * Public
+ */
+
+// TODO: Make this private once the kernel supports local static variables.
 Console::Console()
     : mBase(reinterpret_cast<uint16_t *>(0xB8000)),
       mCursor{0, 0},

src/Console.hh

@@ -41,6 +41,8 @@ struct Console
     static const size_t Width = 80;
     static const size_t Height = 25;
 
+    static auto systemConsole() -> Console&;
+
     Console();
 
     /** Clear the console to the provided color. */

src/Main.cc

@@ -14,8 +14,15 @@
 extern "C"
 void
 kearly()
+{ }
+
+
+/** The beginning of the world... */
+extern "C"
+void
+kmain()
 {
-    kernel::Console console;
+    auto console = kernel::Console::systemConsole();
     console.clear(kernel::Console::Color::Blue);
     console.writeString("Hello world!\n");
 
@@ -31,15 +38,8 @@ kearly()
         i = (i + 1) % 26;
         j = (j + 1) % 500;
 
-        for (uint32_t k = 0; k < (2u << 27) - 1; k++) {
+        for (uint32_t k = 0; k < (2u << 20) - 1; k++) {
             foo /= 2;
         }
     }
 }
-
-
-/** The beginning of the world... */
-extern "C"
-void
-kmain()
-{ }

src/SConscript

@@ -4,11 +4,11 @@
 
 import os
 import os.path
+import shlex
+import subprocess
 
 files = [
     'boot.s',
-    'crti.s',
-    'crtn.s',
     'Main.cc',
     'Console.cc'
 ]
@@ -23,8 +23,18 @@ Append(CCFLAGS='-ffreestanding',
        CXXFLAGS='-fno-exceptions -fno-rtti',
        LINKFLAGS='-nostdlib -lgcc')
 
+# Global constructor files. These must be linked IN THIS ORDER.
+def crtfile_path(name):
+    cmd = shlex.split(env.subst('$CC $CCFLAGS $CFLAGS -print-file-name={}'.format(name)))
+    return subprocess.check_output(cmd).strip()
+
+crtbegin_file = Command('crtbegin.o', [], Copy('$TARGET', crtfile_path('crtbegin.o')))
+crtend_file = Command('crtend.o', [], Copy('$TARGET', crtfile_path('crtend.o')))
+crtinit_files = ['crti.s', crtbegin_file]
+crtfini_files = [crtend_file, 'crtn.s']
+
 linker_script = File('linker.ld')
-kernel = Program('polka.bin', files, LINKFLAGS='-T {}'.format(linker_script.path))
+kernel = Program('polka.bin', crtinit_files + files + crtfini_files, LINKFLAGS='-T {}'.format(linker_script.path))
 Depends(kernel, linker_script)
 Alias('kernel', kernel)