[Bug c/31077] New: C handling of always_inline attribute error and a solution

[zhouyi04 at ios dot cn]

gcc will segment fault when compiling following code (copied from linux kernel)
when no optimize option is given (I need to debug linux kernel without
optimizing interfere my investigation):
gcc -S -i hello1.i
//hello1.i
      1
      2 struct genapic {
      3
      4  int (*check_phys_apicid_present)(int boot_cpu_physical_apicid);
      5
      6  unsigned (*get_apic_id)(unsigned long x);
      7
      8 };
      9
     10 static inline __attribute__((always_inline)) unsigned
get_apic_id(unsigned long x)
     11 {
     12  return 1;
     13 }
     14
     15
     16
     17 static inline  int check_phys_apicid_present(int cpu_physical_apicid)
     18 {
     19
     20  return get_apic_id(2);
     21
     22 }
     23
     24
     25 struct genapic apic_es7000 = { .check_phys_apicid_present =
check_phys_apicid_present,.get_        apic_id = get_apic_id, };

A solution is change gcc-4.1.0's function cgraph_preserve_function_body_p:
1201 bool
1202 cgraph_preserve_function_body_p (tree decl)
1203 {
1204   struct cgraph_node *node;
1205   /* Keep the body; we're going to dump it.  */
1206   if (dump_enabled_p (TDI_tree_all))
1207     return true;
1208   if (!cgraph_global_info_ready)
1209     return (DECL_INLINE (decl) && !flag_really_no_inline);
1210   /* Look if there is any clone around.  */
1211   for (node = cgraph_node (decl); node; node = node->next_clone)
1212     if (node->global.inlined_to)
1213       return true;
1214   return false;
1215 }

into 
bool
cgraph_preserve_function_body_p (tree decl)
{
   struct cgraph_node *node;
   /* Keep the body; we're going to dump it.  */
   if (dump_enabled_p (TDI_tree_all))
     return true;
   if (!cgraph_global_info_ready && !((DECL_INLINE (decl) &&
!flag_really_no_inline))){
      for (node = cgraph_node (decl); node; node = node->next_clone)
        if (node->global.local.disregard_inline_limits)
          return true;
        return false;
   }
   /* Look if there is any clone around.  */
   for (node = cgraph_node (decl); node; node = node->next_clone)
     if (node->global.inlined_to)
       return true;
   return false;
}

best regards
Zhouyi Zhou


-- 
           Summary: C handling of always_inline attribute error and a
                    solution
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zhouyi04 at ios dot cn
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31077