gcc/testsuite/gcc.dg/attr-alias-3.c

   1 // { dg-do link }
   2 // { dg-skip-if "" { "powerpc-ibm-aix*" } }
   3 // { dg-require-alias "" }
   4 // { dg-options "-O2 -fno-common" }
   5
   6 // Copyright 2005 Free Software Foundation, Inc.
   7 // Contributed by Alexandre Oliva <aoliva@redhat.com>
   8
   9 // PR middle-end/24295
  10
  11 // The unit-at-a-time call graph code used to fail to emit variables
  12 // without external linkage that were only used indirectly, through
  13 // aliases.  Although the PR above is about #pragma weak-introduced
  14 // aliases, the underlying machinery is the same.
  15
  16 #ifndef ATTRIBUTE_USED
  17 # define ATTRIBUTE_USED __attribute__((used))
  18 #endif
  19
  20 static int lv1;
  21 extern int Av1a __attribute__((alias ("lv1")));
  22 int *pv1a = &Av1a;
  23
  24 static int lv2;
  25 extern int Av2a __attribute__((alias ("lv2")));
  26 int *pv2a = &lv2;
  27
  28 static int lv3;
  29 extern int Av3a __attribute__((alias ("lv3")));
  30 static int *pv3a ATTRIBUTE_USED = &Av3a;
  31
  32 static int lv4;
  33 extern int Av4a __attribute__((alias ("lv4")));
  34 static int *pv4a = &Av4a;
  35
  36 typedef void ftype(void);
  37
  38 static void lf1(void) {}
  39 extern ftype Af1a __attribute__((alias ("lf1")));
  40 ftype *pf1a = &Af1a;
  41
  42 static void lf2(void) {}
  43 extern ftype Af2a __attribute__((alias ("lf2")));
  44 ftype *pf2a = &Af2a;
  45
  46 static void lf3(void) {}
  47 extern ftype Af3a __attribute__((alias ("lf3")));
  48 static ftype *pf3a ATTRIBUTE_USED = &Af3a;
  49
  50 static void lf4(void) {}
  51 extern ftype Af4a __attribute__((alias ("lf4")));
  52 static ftype *pf4a = &Af4a;
  53
  54 int
  55 main() {
  56 #ifdef __mips
  57   /* Use real asm for MIPS, to stop the assembler warning about
  58      orphaned high-part relocations.  */
  59   asm volatile ("lw $2,%0\n\tlw $2,%1" : : "m" (pv4a), "m" (pf4a) : "$2");
  60 #else
  61   asm volatile ("" : : "m" (pv4a), "m" (pf4a));
  62 #endif
  63 }