When we are outputing an empty loadable section, we consider it not loadable.
But we still align it at page boundary:
[EMAIL PROTECTED] empty-10]$ !cat
cat foo.c
extern char *__init_array_start;
int xxx = 10;
_start ()
{
return __init_array_start != 0;
}
[EMAIL PROTECTED] 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
[EMAIL PROTECTED] 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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