rt0 library & binary sizes

Binary	Arch	Size	Purpose
librt0.a	i386	2810	Startup code+syscall
librt0.a	x86_64	3974	Startup code+syscall
t/hello.exe	i386	624	Hello World\n
t/hello.exe	x86_64	824	Hello World\n
hello.exe	i386	2988	Hello World\n with glibc
hello.exe	x86_64	4200	Hello World\n with glibc
t/null.exe	i386	560	Empty main
t/null.exe	x86_64	768	Empty main
null.exe	i386	2888	Empty main with glibc
null.exe	x86_64	2988	Empty main with glibc
...	...	...	With __RT0_WITH_FASTER_SYSCALL__
librt0.a	i386	3980	Startup code+syscall
librt0.a	x86_64	5604	Startup code+syscall
t/hello.exe	i386	608	Hello World\n
t/hello.exe	x86_64	792	Hello World\n
t/null.exe	i386	552	Empty main
t/null.exe	x86_64	752	Empty main

Compiler: GCC 4.8.5, GNU LD linker 2.25.1, ld/binutils 2.25.1, OS: RHEL 7.3, Source: Author Compiler: GCC 4.8.4, gold linker 1.11, ld/binutils 2.24, OS: Ubuntu 14.04.3, Source: Author

Compile Flags: -Os -nostdlib -fomit-frame-pointer -fno-stack-protector -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-unroll-loops -fmerge-all-constants -fno-ident -mfpmath=387 -mfancy-math-387 -ffunction-sections -fdata-sections -Wl,--gc-sections

Link Flags: -s -static -nostdlib -z norelro --hash-style=sysv --build-id=none --gc-sections

---

HelloWorld & null compiled with flags above but without -nostdlib.

HelloWorld.glibc.c

#include <unistd.h>

int main( int argc, char** argv, char** envp )
{
   int ret = write( 1, "Hello World!\n", 13 );
   return( 0 );
}

---

null.glibc.c

int main( int argc, char** argv, char** envp )
{
   return( 0 );
}