Make 'writer' examples to generate x86_64 files

.gitignore

@@ -44,6 +44,8 @@ tests/elf_examples/write_exe_i386_32_section_added
 tests/elf_examples/ppc-32bit-testcopy*.elf
 tests/elf_examples/null_section_inside_segment*
 tests/elf_examples/segment_containing_no_section*
+examples/writer/hello_x86_64
+examples/write_obj/hello
 
 # various unwanted files (backups, objects, cmake artifacts)
 *~

examples/write_obj/write_obj.cpp

@@ -7,7 +7,7 @@
  * 2. Execute result file write_obj
  *    ./write_obj
  * 3. Link output file hello.o:
- *    gcc -m32 -s -nostartfiles -nostdlib hello.o -o hello
+ *    ld -m elf x64 -o hello hello.o
  * 4. Run the result file:
  *    ./hello
  */
@@ -21,11 +21,11 @@ int main( void )
     elfio writer;
 
     // You can't proceed before this function call!
-    writer.create( ELFCLASS32, ELFDATA2LSB );
+    writer.create( ELFCLASS64, ELFDATA2LSB );
 
     writer.set_os_abi( ELFOSABI_LINUX );
     writer.set_type( ET_REL );
-    writer.set_machine( EM_386 );
+    writer.set_machine(EM_X86_64);
 
     // This is our code
     char text[] = { '\xB8', '\x04', '\x00', '\x00', '\x00',   // mov eax, 4

examples/writer/writer.cpp

@@ -7,11 +7,11 @@ int main( void )
     elfio writer;
     
     // You can't proceed without this function call!
-    writer.create( ELFCLASS32, ELFDATA2LSB );
+    writer.create( ELFCLASS64, ELFDATA2LSB );
 
     writer.set_os_abi( ELFOSABI_LINUX );
     writer.set_type( ET_EXEC );
-    writer.set_machine( EM_386 );
+    writer.set_machine( EM_X86_64 );
 
     // Create code section
     section* text_sec = writer.sections.add( ".text" );
@@ -41,7 +41,7 @@ int main( void )
     // Add code section into program segment
     text_seg->add_section_index( text_sec->get_index(), text_sec->get_addr_align() );
 
-    // Create data section*
+    // Create data section
     section* data_sec = writer.sections.add( ".data" );
     data_sec->set_type( SHT_PROGBITS );
     data_sec->set_flags( SHF_ALLOC | SHF_WRITE );
@@ -77,7 +77,7 @@ int main( void )
     writer.set_entry( 0x08048000 );
 
     // Create ELF file
-    writer.save( "hello_i386_32" );
+    writer.save("hello_x86_64");
 
     return 0;
 }