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#!/bin/bash
...
export SRC="src"

export CC="gcc"
export LNK="ld"
export ASM="as"
...

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#!/bin/bash

CCOPT="-Wall -Werror -nostdlib -nostartfiles -nodefaultlibs"

set -x

$CC -c $SRC/os/core_video.cpp -o $SRC/os/core_video.o $CCOPT
$CC -c $SRC/os/core.cpp -o $SRC/os/core.o $CCOPT
$ASM $SRC/os/loader.s -o $SRC/os/loader.o
$ASM $SRC/os/multiboot.s -o $SRC/os/multiboot.o
$LNK -T $SRC/aux/link_core.ld -o $SRC/os/core.bin \
    $SRC/os/multiboot.o \
    $SRC/os/core_video.o \
    $SRC/os/core.o $SRC/os/loader.o

set +x

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+ ld -T src/aux/link_core.ld -o src/os/core.bin src/os/multiboot.o src/os/core_video.o src/os/core.o src/os/loader.o
src/os/core.o(.text+0x61): In function `main':
core.cpp: undefined reference to `_Unwind_Resume'
src/os/core.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
+

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void KVideo::write( char const * ptr )
{
    while ( *ptr )
    {
        put(*ptr++);
    }
}

KVideo& KVideo::operator<<( char const * ptr )
{
    write(ptr);
    return *this;
}

KVideo& KVideo::operator<<( char const c )
{
    put(c);
    return *this;
}

KVideo& KVideo::operator<<( void * )
{
    std::uintptr_t address = reinterpret_cast< std::uintptr_t >( ptr );
    std::uint_fast8_t tmpNumericBase = mNumericBase;
    mNumericBase = 16;
    operator<<( address );
    mNumericBase = tmpNumericBase;
    return *this;
}

KVideo& KVideo::operator<<( void (*formatter)() )
{
    formatter();
    return *this;
}

KVideo& KVideo::operator<<( std::intmax_t integer )
{
    std::uintmax_t newint;
    if ( integer < 0 )
    {
        put('-');
        newint = integer * -1;
    }
    else
    {
        newint = integer;
    }
    return operator<<(newinteger);
}

void endl()
{
    KVideo::put('\n');
}

void hex()
{
    KVideo::setBase(16);
}

void dec()
{
    KVideo::setBase(10);
}

void KVideo::setBase( std::uint_fast8_t const )
{
    mNumericBase = base;
}

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KVideo kout;

int _main( multiboot_data* mbd, uint32_t magic )
{
    if ( magic != 0x2BADB002 )
    {
        kout << "ERROR! Magic number expected '0x2BADB002', found '" << hex << magic << "'!" << endl;
        return;
    }
    kout << "Multiboot data at " << mbd << endl;
    kout << "The answer to all questions is " << dec << 42 << endl;
}

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class core_Keybd {
   public:
      /* ... */
   private:
      /* ... */
      void isr_keybd(void) __attribute__ (( signal, naked )); /* this is line 35 */
};

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#include "../modules.h/keybd.h"
/* ... */
void isr_keybd(void) {
   /* nothing here for now */
}

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+ gcc -c src/os/modules/keybd.cpp -o src/os/modules/keybd.o -Wall -Werror -nostdlib -nostartfiles -nodefaultlibs -fno-exceptions
cc1plus: warnings being treated as errors
src/os/modules/../modules.h/keybd.h:35: warning: `signal' attribute directive ignored
src/os/modules/../modules.h/keybd.h:35: warning: `naked' attribute directive ignored