[Bug ld/3314] New: ELF linker aligns empty section

[hjl at lucon dot org]

When we are outputing an empty loadable section, we consider it not loadable.
But we still align it at page boundary:

address@hidden empty-10]$ !cat
cat foo.c
extern char *__init_array_start;

int xxx = 10;

_start ()
{
  return __init_array_start != 0;
}
address@hidden empty-10]$ make LD=ld
gcc    -c -o foo.o foo.c
ld -o foo foo.o
readelf -Sl foo
There are 9 section headers, starting at offset 0x2001b0:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .text             PROGBITS         00000000004000e8  000000e8
       0000000000000016  0000000000000000  AX       0     0     4
  [ 2] .eh_frame         PROGBITS         0000000000400100  00000100
       0000000000000038  0000000000000000   A       0     0     8
  [ 3] .init_array       INIT_ARRAY       0000000000600138  00200138
       0000000000000000  0000000000000000  WA       0     0     1
  [ 4] .data             PROGBITS         0000000000600138  00000138
       0000000000000004  0000000000000000  WA       0     0     4
  [ 5] .comment          PROGBITS         0000000000000000  00200138
       000000000000002d  0000000000000000           0     0     1
  [ 6] .shstrtab         STRTAB           0000000000000000  00200165
       0000000000000046  0000000000000000           0     0     1
  [ 7] .symtab           SYMTAB           0000000000000000  002003f0
       0000000000000138  0000000000000018           8     8     8
  [ 8] .strtab           STRTAB           0000000000000000  00200528
       000000000000003d  0000000000000000           0     0     1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings)
  I (info), L (link order), G (group), x (unknown)
  O (extra OS processing required) o (OS specific), p (processor specific)

Elf file type is EXEC (Executable file)
Entry point 0x4000e8
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000400000 0x0000000000400000
                 0x0000000000000138 0x0000000000000138  R E    200000
  LOAD           0x0000000000000138 0x0000000000600138 0x0000000000600138
                 0x0000000000000004 0x0000000000000004  RW     200000
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     8

 Section to Segment mapping:
  Segment Sections...
   00     .text .eh_frame
   01     .data
   02
address@hidden empty-10]$

-- 
           Summary: ELF linker aligns empty section
           Product: binutils
           Version: 2.18 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: hjl at lucon dot org
                CC: bug-binutils at gnu dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=3314

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