static int a[100];

int f(int i, int v) {
    a[i] = v;
    return *a;
}

    .feature at_in_identifiers
    .feature dollar_in_identifiers
    .autoimport +
    .p02
    .importzp _sp0, _sp1, _fp0, _fp1
    .importzp _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7
    .importzp _s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7
    .importzp _e0, _e1, _e2, _e3, _e4, _e5, _e6, _e7
    .importzp _e8, _e9, _e10, _e11, _e12, _e13, _e14, _e15
    .importzp _e16, _e17, _e18, _e19, _e20, _e21, _e22, _e23
    .importzp _e24, _e25, _e26, _e27, _e28, _e29, _e30, _e31
    .importzp _tmp0, _tmp1
    .importzp _sa, _sx, _sy
    .segment "CODE"
a$:
    .res 200
    .export f$
f$:
; frame size 4, pretend size 0, outgoing size 0
    lda _sp1
    pha
    lda _sp0
    pha
    [...]

int f(int i, int v) {
    static int a[100];
    a[i] = v;
    return *a;
}

***************************
* Building tiny C library *
***************************

.: compile: exit.c
.: compile: abort.c
.: compile: stdfiles.c
.: compile: semi65x/fputc.c
.: compile: fputs.c
.: compile: putchar.c
.: compile: puts.c
.: compile: vfprintf.c
vfprintf.c: In function 'print_udec':
vfprintf.c:36:1: internal compiler error: Max. number of generated reload insns per insn is achieved (90)

 }
  ^
0x83865b lra_constraints(bool)
	../../gcc-src/gcc/lra-constraints.c:4831
0x81e34b lra(_IO_FILE*)
	../../gcc-src/gcc/lra.c:2335
0x7b70f7 do_reload
	../../gcc-src/gcc/ira.c:5417
0x7b75df execute
	../../gcc-src/gcc/ira.c:5588

$ gcc --version
gcc (Ubuntu 6.3.0-12ubuntu2) 6.3.0 20170406

pi@raspberrypi ~/code/code/gcc-6502-bits $ gcc --version
gcc (Debian 4.6.3-14+rpi1) 4.6.3