https://sourceware.org/bugzilla/show_bug.cgi?id=19446
Bug ID: 19446
Summary: BFD linker discards section without alloc section
attribute under certain conditions
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: xinliangli at gmail dot com
Target Milestone: ---
If a section is not marked with SHF_ALLOC attribute and when --gc-sections is
on, the BFD linker only keeps it if the section has no references to other
symbols. If there is reference to other symbols, the linker will garbage
collect it.
By comparison, Gold linker does not garbage collect such sections regardless of
the contents of the section.
Example: t.s
gcc -fuse-ld=bfd -Wl,--gc-sections t.s
objdump -h a.out |grep UNREF
Changing the assembly file a little by making unref initialized to 0, linker
will keep the UNREF section.
The version of the linker tested is 2.24.
.file "unref2.c"
.comm g0,4,4
.globl unref
.section UNREF,"",@progbits
.align 8
.type unref, @object
.size unref, 8
unref:
.quad g0
.text
.globl main
.type main, @function
main:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl $1, %eax
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size main, .-main
.ident "GCC: (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4"
.section .note.GNU-stack,"",@progbits
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