the limits of GCC's unicode identifier support

Makefile

CFLAGS=-std=c99

use-it: use-it.o symbol.o

symbol.o: symbol.c symbol.h

use-it.o: use-it.c symbol.h

symbol.c

#include "symbol.h"

void *re\u00E4lloc(void *ptr, size_t size) {
  return realloc(ptr,size);
}

symbol.h

#pragma once

#include <stdlib.h>

extern void *re\u00E4lloc(void *ptr, size_t size);

symbols in the executable

$ nm use-it
0000000000201040 B __bss_start
                 w __cxa_finalize@@GLIBC_2.2.5
0000000000201030 D __data_start
0000000000201030 W data_start
0000000000201038 D __dso_handle
0000000000200df8 d _DYNAMIC
0000000000201040 D _edata
0000000000201048 B _end
00000000000007b4 T _fini
0000000000201000 d _GLOBAL_OFFSET_TABLE_
                 w __gmon_start__
00000000000007ec r __GNU_EH_FRAME_HDR
0000000000000540 T _init
0000000000200df0 t __init_array_end
0000000000200de8 t __init_array_start
00000000000007c0 R _IO_stdin_used
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
00000000000007b0 T __libc_csu_fini
0000000000000750 T __libc_csu_init
                 U __libc_start_main@@GLIBC_2.2.5
00000000000006ba T main
                 U malloc@@GLIBC_2.2.5
                 U printf@@GLIBC_2.2.5
0000000000000723 T reälloc
                 U realloc@@GLIBC_2.2.5
00000000000005b0 T _start
0000000000201040 D __TMC_END__

use-it.c

#include <stdlib.h>
#include <stdio.h>
#include "symbol.h"

int main(int argc, char **argv) {
  void *x = malloc(10);
  printf("first pointer: %p",x);
  x=re\u00E4lloc(x,20);
  printf("second pointer: %p",x);
  return 0;
}