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[Bug binutils/24031] New: Cannot remove section related to a function (e
From: |
sasha2048 at gmail dot com |
Subject: |
[Bug binutils/24031] New: Cannot remove section related to a function (even if the function is in separate section and isn't referenced elsewhere) |
Date: |
Mon, 24 Dec 2018 11:37:51 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=24031
Bug ID: 24031
Summary: Cannot remove section related to a function (even if
the function is in separate section and isn't
referenced elsewhere)
Product: binutils
Version: 2.30
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: sasha2048 at gmail dot com
Target Milestone: ---
Created attachment 11491
--> https://sourceware.org/bugzilla/attachment.cgi?id=11491&action=edit
Samples: file.c, file.s and file.o
Suppose, I have the following C-source file:
$ cat file.c
void f() {}
void g() {}
I can compile it to an object-file with the -ffunction-sections flag:
$ gcc -c -ffunction-sections file.c -o file.o
It corresponds to the following assembler code:
.file "file.c"
.text
.section .text.f,"ax",@progbits
.globl f
.type f, @function
f:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size f, .-f
.section .text.g,"ax",@progbits
.globl g
.type g, @function
g:
.LFB1:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
nop
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE1:
.size g, .-g
.ident "GCC: (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0"
.section .note.GNU-stack,"",@progbits
Then I try to remove the .text.g section (with the g function) from object
file, I get the following error:
$ objcopy --remove-section .text.g file.o
objcopy: stReXCNA: symbol `.text.g' required but not present
objcopy:stReXCNA: No symbols
Is there reason why such task can't be performed by objcopy?
See also: https://stackoverflow.com/q/39873148
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