https://sourceware.org/bugzilla/show_bug.cgi?id=24819
Bug ID: 24819
Summary: ld -r fails to handle .init_array section in comdat
group
Product: binutils
Version: 2.33 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-cfl-1 reloc-3]$ cat 1.s
.text
.section .text.startup.foo1,"axG",@progbits,.group1,comdat
.p2align 4,,15
.type foo1, @function
foo1:
.LFB0:
.cfi_startproc
movl $30, init1(%rip)
ret
.cfi_endproc
.LFE0:
.size foo1, .-foo1
.section .init_array,"awG",@init_array,.group1,comdat
.align 8
.quad foo1
[hjl@gnu-cfl-1 reloc-3]$ cat i.s
.text
.section .text.startup.foo1,"axG",@progbits,.group1,comdat
.p2align 4,,15
.type foo1, @function
foo1:
.LFB0:
.cfi_startproc
movl $1, init1(%rip)
ret
.cfi_endproc
.LFE0:
.size foo1, .-foo1
.section .init_array,"awG",@init_array,.group1,comdat
.align 8
.quad foo1
.section .text.startup.foo2,"axG",@progbits,.group2,comdat
.p2align 4,,15
.type foo2, @function
foo2:
.LFB1:
.cfi_startproc
movl $2, init2(%rip)
ret
.cfi_endproc
.LFE1:
.size foo2, .-foo2
.section .init_array,"awG",@init_array,.group2,comdat
.align 8
.quad foo2
.section .text.startup.foo3,"ax",@progbits
.p2align 4,,15
.type foo3, @function
foo3:
.LFB2:
.cfi_startproc
movl $3, init3(%rip)
ret
.cfi_endproc
.LFE2:
.size foo3, .-foo3
.section .init_array
.align 8
.quad foo3
.section .note.GNU-stack,"",@progbits
[hjl@gnu-cfl-1 reloc-3]$ cat m.c
#include <stdio.h>
int init1;
int init2;
int init3;
int
main (void)
{
printf ("init1: %d\n", init1);
printf ("init2: %d\n", init2);
printf ("init3: %d\n", init3);
if (init1 == 30 && init2 == 2 && init3 == 3)
{
printf ("PASS\n");
return 0;
}
else
{
printf ("FAIL\n");
return 1;
}
}
[hjl@gnu-cfl-1 reloc-3]$ make
as -o 1.o 1.s
as -o i.o i.s
cc -O2 -c -o m.o m.c
cc -O2 -o x 1.o i.o m.o
./ld -r -o i-r.o i.o
cc -O2 -o y 1.o i-r.o m.o
./x
init1: 30
init2: 2
init3: 3
PASS
./y
init1: 30
init2: 2
init3: 0
FAIL
make: *** [Makefile:8: all] Error 1
[hjl@gnu-cfl-1 reloc-3]$
The problem is
[hjl@gnu-cfl-1 reloc-3]$ readelf -rW i-r.o
...
Relocation section '.rela.init_array' at offset 0x430 contains 2 entries:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000000000 0000000f00000001 R_X86_64_64 0000000000000000 foo1
+ 0
0000000000000008 0000000700000001 R_X86_64_64 0000000000000000
.text.startup.foo3 + 0
where
.section .init_array
.align 8
.quad foo3
is merged into
.section .init_array,"awG",@init_array,.group1,comdat
.align 8
.quad foo1
When .group1 group in i-r.o is discarded, foo3 isn't called.
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