attr-alias-3.c

用于进行gcc测试

// { dg-do link }
// { dg-xfail-if "" { "powerpc-ibm-aix*" } { "*" } { "" } }
// { dg-require-alias "" }
// { dg-options "-O2 -fno-common" }

// Copyright 2005 Free Software Foundation, Inc.
// Contributed by Alexandre Oliva <[e-mail]>

// PR middle-end/24295

// The unit-at-a-time call graph code used to fail to emit variables
// without external linkage that were only used indirectly, through
// aliases.  Although the PR above is about #pragma weak-introduced
// aliases, the underlying machinery is the same.

#ifndef ATTRIBUTE_USED
# define ATTRIBUTE_USED __attribute__((used))
#endif

static int lv1;
extern int Av1a __attribute__((alias ("lv1")));
int *pv1a = &Av1a;

static int lv2;
extern int Av2a __attribute__((alias ("lv2")));
int *pv2a = &lv2;

static int lv3;
extern int Av3a __attribute__((alias ("lv3")));
static int *pv3a ATTRIBUTE_USED = &Av3a;

static int lv4;
extern int Av4a __attribute__((alias ("lv4")));
static int *pv4a = &Av4a;

typedef void ftype(void);

static void lf1(void) {}
extern ftype Af1a __attribute__((alias ("lf1")));
ftype *pf1a = &Af1a;

static void lf2(void) {}
extern ftype Af2a __attribute__((alias ("lf2")));
ftype *pf2a = &Af2a;

static void lf3(void) {}
extern ftype Af3a __attribute__((alias ("lf3")));
static ftype *pf3a ATTRIBUTE_USED = &Af3a;

static void lf4(void) {}
extern ftype Af4a __attribute__((alias ("lf4")));
static ftype *pf4a = &Af4a;

main() {
#ifdef __mips
  /* Use real asm for MIPS, to stop the assembler warning about
     orphaned high-part relocations.  */
  asm volatile ("lw $2,%0\n\tlw $2,%1" : : "m" (pv4a), "m" (pf4a) : "$2");
#else
  asm volatile ("" : : "m" (pv4a), "m" (pf4a));
#endif
}