http://sourceware.org/bugzilla/show_bug.cgi?id=14265
Bug #: 14265
Summary: -gc-sections ignores KEEP annotations
Product: binutils
Version: 2.22
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: i...@airs.com
ReportedBy: enrico.sch...@informatik.tu-chemnitz.de
CC: ccout...@google.com
Classification: Unclassified
sections which are marked with KEEP() in a linker file will be removed
when -gc-sections is specified. Old bfd linker kept them as expected.
In the sample below, it is expected that:
* __foo0_start == __foo0_end (can be optimized way)
* __foo1_start < __foo1_end
* __foo2_end - __foo2_start == __foo1_end - __foo1_start
The last two expectations hold with bfd linker but not with gold.
--- x2.ld ---
SECTIONS
{
.text : { *(.text) }
__foo0_start = .;
.foo0 : { *(.foo0.*) }
__foo0_end = .;
__foo1_start = .;
.foo1 : { KEEP(*(.foo1.*)) }
__foo1_end = .;
.foo2 : {
__foo2_start = .;
KEEP(*(.foo2.*))
__foo2_end = .;
}
}
--- x2.c ---
int foo0 __attribute__((used,section(".foo0.0")));
int foo1 __attribute__((used,section(".foo1.0")));
int foo2 __attribute__((used,section(".foo2.0")));
extern unsigned long __foo0_start;
extern unsigned long __foo0_end;
extern unsigned long __foo1_start;
extern unsigned long __foo1_end;
extern unsigned long __foo2_start;
extern unsigned long __foo2_end;
int main() {
return ((__foo0_end - __foo0_start) -
(__foo1_end - __foo1_start) -
(__foo2_end - __foo2_start));
}
-----
$ gcc -c x2.c
$ ld.gold -gc-sections -T x2.ld x2.o -o /tmp/x2-gold
$ ld.bfd -gc-sections -T x2.ld x2.o -o /tmp/x2-bfd
$ readelf -s /tmp/x2-bfd /tmp/x2-gold
File: /tmp/x2-bfd
Symbol table '.symtab' contains 13 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 SECTION LOCAL DEFAULT 1
2: 0000000000000004 0 SECTION LOCAL DEFAULT 2
3: 0000000000000000 0 SECTION LOCAL DEFAULT 3
4: 0000000000000000 0 FILE LOCAL DEFAULT ABS x2.c
5: 0000000000000004 0 NOTYPE LOCAL DEFAULT 2 __foo2_start
6: 0000000000000000 0 NOTYPE LOCAL DEFAULT ABS __foo1_start
7: 0000000000000008 0 NOTYPE LOCAL DEFAULT 2 __foo2_end
8: 0000000000000000 0 NOTYPE LOCAL DEFAULT ABS __foo0_start
9: 0000000000000000 0 NOTYPE LOCAL DEFAULT ABS __foo0_end
10: 0000000000000004 0 NOTYPE LOCAL DEFAULT ABS __foo1_end
11: 0000000000000004 4 OBJECT GLOBAL DEFAULT 2 foo2
12: 0000000000000000 4 OBJECT GLOBAL DEFAULT 1 foo1
File: /tmp/x2-gold
Symbol table '.symtab' contains 9 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FILE LOCAL DEFAULT ABS x2.c
2: 0000000000000000 76 FUNC GLOBAL DEFAULT 1 main
3: 0000000000000090 0 NOTYPE GLOBAL DEFAULT ABS __foo0_end
4: 0000000000000090 0 NOTYPE GLOBAL DEFAULT ABS __foo0_start
5: 0000000000000090 0 NOTYPE GLOBAL DEFAULT ABS __foo1_start
6: 0000000000000090 0 NOTYPE GLOBAL DEFAULT ABS __foo1_end
7: 0000000000000090 0 NOTYPE GLOBAL DEFAULT ABS __foo2_start
8: 00000000000000dc 0 NOTYPE GLOBAL DEFAULT ABS __foo2_end
$ ld.gold --version
GNU gold (version 2.22.52.0.1-10.fc17 20120131) 1.11
$ ld.bfd --version
GNU ld version 2.22.52.0.1-10.fc17 20120131
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