[Bug ld/15780] .gnu.warning.SYMBOL section treatment needs improvement

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15780

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
address@hidden pr15780]$ cat end.c
#include <stdio.h>

void
foo ()
{
  printf ("TEST1\n");
}
address@hidden pr15780]$ cat beginwarn.c 
static const char _evoke_link_warning_foo []
  __attribute__ ((used, section (".gnu.warning.foo")))
    = "function foo is deprecated";

extern void foo (void);

static void (*const init_array []) (void)
  __attribute__ ((used, section (".init_array"), aligned (sizeof (void *))))
  = { foo };
address@hidden pr15780]$ make
gcc -fPIC -fPIC   -c -o end.o end.c
gcc -fPIC -fPIC   -c -o beginwarn.o beginwarn.c
./ld -shared -o libfoo.so end.o beginwarn.o
beginwarn.o:(.init_array+0x0): warning: function foo is deprecated
readelf -SlW libfoo.so
There are 18 section headers, starting at offset 0x540:

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg
Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00     
0   0  0
  [ 1] .hash             HASH            0000000000000120 000120 000030 04   A 
2   0  8
  [ 2] .dynsym           DYNSYM          0000000000000150 000150 0000a8 18   A 
3   2  8
  [ 3] .dynstr           STRTAB          00000000000001f8 0001f8 000022 00   A 
0   0  1
  [ 4] .rela.dyn         RELA            0000000000000220 000220 000018 18   A 
2   0  8
  [ 5] .rela.plt         RELA            0000000000000238 000238 000018 18   A 
2   6  8
  [ 6] .plt              PROGBITS        0000000000000250 000250 000020 10  AX 
0   0 16
  [ 7] .text             PROGBITS        0000000000000270 000270 000012 00  AX 
0   0  1
  [ 8] .rodata           PROGBITS        0000000000000282 000282 000006 00   A 
0   0  1
  [ 9] .gnu.warning.foo  PROGBITS        0000000000000290 000290 00001b 00   A 
0   0 16
  [10] .eh_frame         PROGBITS        00000000000002b0 0002b0 000060 00   A 
0   0  8
  [11] .init_array       INIT_ARRAY      0000000000200310 000310 000008 00  WA 
0   0  8
  [12] .dynamic          DYNAMIC         0000000000200318 000318 000140 10  WA 
3   0  8
  [13] .got.plt          PROGBITS        0000000000200458 000458 000020 08  WA 
0   0  8
  [14] .comment          PROGBITS        0000000000000000 000478 00002c 01  MS 
0   0  1
  [15] .shstrtab         STRTAB          0000000000000000 0004a4 000095 00     
0   0  1
  [16] .symtab           SYMTAB          0000000000000000 0009c0 000288 18    
17  22  8
  [17] .strtab           STRTAB          0000000000000000 000c48 000076 00     
0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), l (large)
  I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
  O (extra OS processing required) o (OS specific), p (processor specific)

Elf file type is DYN (Shared object file)
Entry point 0x270
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz
  Flg Align
  LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x000310
0x000310 R E 0x200000
  LOAD           0x000310 0x0000000000200310 0x0000000000200310 0x000168
0x000168 RW  0x200000
  DYNAMIC        0x000318 0x0000000000200318 0x0000000000200318 0x000140
0x000140 RW  0x8
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW  0x10

 Section to Segment mapping:
  Segment Sections...
   00     .hash .dynsym .dynstr .rela.dyn .rela.plt .plt .text .rodata
.gnu.warning.foo .eh_frame 
   01     .init_array .dynamic .got.plt 
   02     .dynamic 
   03     
address@hidden pr15780]$ 

.gnu.warning.foo section is in PT_LOAD segment.

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