http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49777
Summary: for c++ code, without -g option, cannot generate PIC
*.so library.
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: hekun_he...@163.com
test.cc:
int f_b ()
{
return 1;
}
int f_a () throw ()
{
return f_b();
}
without -g:
$ armv7a-linux-gnueabi-gcc -S -fPIC -DPIC test.cc -o test.s
$ armv7a-linux-gnueabi-gcc -c test.s -o test.o
$ armv7a-linux-gnueabi-gcc -shared test.o -o test.so
$ armv7a-linux-gnueabi-readelf -d test.so | grep TEXTREL
0x0016 (TEXTREL)0x0
with -g:
$ armv7a-linux-gnueabi-gcc -S -fPIC -DPIC test.cc -o test-g.s -g
$ armv7a-linux-gnueabi-gcc -c test-g.s -o test.o
$ armv7a-linux-gnueabi-gcc -shared test.o -o test.so
$ armv7a-linux-gnueabi-readelf -d test.so | grep TEXTREL
nothing output.
the content of test.s:
1 .arch armv7-a
2 .eabi_attribute 27, 3
3 .fpu vfpv3-d16
4 .eabi_attribute 20, 1
5 .eabi_attribute 21, 1
6 .eabi_attribute 23, 3
7 .eabi_attribute 24, 1
8 .eabi_attribute 25, 1
9 .eabi_attribute 26, 2
10 .eabi_attribute 30, 6
11 .eabi_attribute 18, 4
12 .file test.cc
13 .text
14 .align 2
15 .global _Z3f_bv
16 .type _Z3f_bv, %function
17 _Z3f_bv:
18 .fnstart
19 .LFB0:
20 .cfi_startproc
21 @ args = 0, pretend = 0, frame = 0
22 @ frame_needed = 1, uses_anonymous_args = 0
23 @ link register save eliminated.
24 str fp, [sp, #-4]!
25 .save {fp}
26 .cfi_def_cfa_offset 4
27 .setfp fp, sp, #0
28 add fp, sp, #0
29 .cfi_offset 11, -4
30 .cfi_def_cfa_register 11
31 mov r3, #1
32 mov r0, r3
33 add sp, fp, #0
34 ldmfd sp!, {fp}
35 bx lr
36 .cfi_endproc
37 .LFE0:
38 .fnend
39 .size _Z3f_bv, .-_Z3f_bv
40 .align 2
41 .global _Z3f_av
42 .type _Z3f_av, %function
43 _Z3f_av:
44 .fnstart
45 .LFB1:
46 .cfi_startproc
47 .cfi_personality 0x0,__gxx_personality_v0
48 .cfi_lsda 0x0,.LLSDA1
49 @ args = 0, pretend = 0, frame = 0
50 @ frame_needed = 1, uses_anonymous_args = 0
51 stmfd sp!, {fp, lr}
52 .save {fp, lr}
53 .cfi_def_cfa_offset 8
54 .setfp fp, sp, #4
55 add fp, sp, #4
56 .cfi_offset 14, -4
57 .cfi_offset 11, -8
58 .cfi_def_cfa 11, 4
59 .LEHB0:
60 bl _Z3f_bv(PLT)
61 .LEHE0:
62 mov r3, r0
63 mov r0, r3
64 ldmfd sp!, {fp, pc}
65 .L5:
66 mov r3, r0
67 mov r2, r1
68 cmn r2, #1
69 beq .L4
70 .LEHB1:
71 bl __cxa_end_cleanup(PLT)
72 .L4:
73 mov r0, r3
74 bl __cxa_call_unexpected(PLT)
75 .LEHE1:
76 .cfi_endproc
77 .LFE1:
78 .global __gxx_personality_v0
79 .personality__gxx_personality_v0
80 .handlerdata
81 .align 2
82 .LLSDA1:
83 .byte 0xff
84 .byte 0x0
85 .uleb128 .LLSDATT1-.LLSDATTD1
86 .LLSDATTD1:
87 .byte 0x1
88 .uleb128 .LLSDACSE1-.LLSDACSB1
89 .LLSDACSB1:
90 .uleb128 .LEHB0-.LFB1
91 .uleb128 .LEHE0-.LEHB0
92 .uleb128 .L5-.LFB1
93 .uleb128 0x1
94 .uleb128 .LEHB1-.LFB1
95 .uleb128 .LEHE1-.LEHB1
96 .uleb128 0x0
97 .uleb128 0x0
98 .LLSDACSE1:
99 .byte 0x7f
100 .byte 0x0
101 .align 2
102 .LLSDATT1:
103 .word 0
104 .fnend
105 .size _Z3f_av, .-_Z3f_av
106 .ident GCC: (GNU) 4.5.1
107 .section.note.GNU-stack,,%progbits
the content of test-g.s:
1 .arch armv7-a
2 .eabi_attribute 27, 3
3 .fpu vfpv3-d16
4 .eabi_attribute 20, 1
5 .eabi_attribute 21, 1
6 .eabi_attribute 23, 3
7 .eabi_attribute 24, 1
8 .eabi_attribute 25, 1
9 .eabi_attribute 26, 2
10 .eabi_attribute 30, 6
11
