https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96455
Bug ID: 96455
Summary: Partial Linking (-r) with LTO issue
Product: gcc
Version: 9.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: dongjianqiang2 at huawei dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Hi, there is a partial linking with lto issue after upgrading gcc7.3.0
(binutils 2.34) to gcc9.3.1 (binutils 2.34).
void bar() {
return;
}
void foo() {
return;
}
gcc -flto -o bar.o -c bar.c
gcc -flto -o foo.o -c foo.c
gcc -flto -no-pie -o a.out -Wl,-r bar.o foo.o -nostdlib
gcc 7.3.0 :
readelf -S a.out
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000000000 00000040
0000000000000008 0000000000000000 AX 0 0 4
[ 2] .eh_frame PROGBITS 0000000000000000 00000048
000000000000003c 0000000000000000 A 0 0 8
[ 3] .rela.eh_frame RELA 0000000000000000 000001e0
0000000000000030 0000000000000018 I 8 2 8
[ 4] .data PROGBITS 0000000000000000 00000084
0000000000000000 0000000000000000 WA 0 0 1
[ 5] .bss NOBITS 0000000000000000 00000084
0000000000000000 0000000000000000 WA 0 0 1
[ 6] .comment PROGBITS 0000000000000000 00000084
000000000000002b 0000000000000001 MS 0 0 1
[ 7] .note.GNU-stack PROGBITS 0000000000000000 000000af
0000000000000000 0000000000000000 0 0 1
[ 8] .symtab SYMTAB 0000000000000000 000000b0
0000000000000120 0000000000000018 9 10 8
[ 9] .strtab STRTAB 0000000000000000 000001d0
000000000000000f 0000000000000000 0 0 1
[10] .shstrtab STRTAB 0000000000000000 00000210
0000000000000054 0000000000000000 0 0 1
gcc 9.3.1 :
readelf -S a.out
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000000000 00000040
0000000000000000 0000000000000000 AX 0 0 1
[ 2] .data PROGBITS 0000000000000000 00000040
0000000000000000 0000000000000000 WA 0 0 1
[ 3] .bss NOBITS 0000000000000000 00000040
0000000000000000 0000000000000000 WA 0 0 1
[ 4] .comment PROGBITS 0000000000000000 00000040
000000000000003a 0000000000000001 MS 0 0 1
[ 5] .gnu.lto_.profile PROGBITS 0000000000000000 0000007a
000000000000000e 0000000000000000 E 0 0 1
[ 6] .gnu.lto_.icf.553 PROGBITS 0000000000000000 00000088
000000000000000f 0000000000000000 E 0 0 1
[ 7] .gnu.lto_.jmpfunc PROGBITS 0000000000000000 00000097
000000000000001e 0000000000000000 E 0 0 1
[ 8] .gnu.lto_.inline. PROGBITS 0000000000000000 000000b5
000000000000002a 0000000000000000 E 0 0 1
[ 9] .gnu.lto_.purecon PROGBITS 0000000000000000 000000df
000000000000000e 0000000000000000 E 0 0 1
[10] .gnu.lto_bar.553c PROGBITS 0000000000000000 000000ed
00000000000000bc 0000000000000000 E 0 0 1
[11] .gnu.lto_foo.553c PROGBITS 0000000000000000 000001a9
00000000000000bb 0000000000000000 E 0 0 1
[12] .gnu.lto_.symbol_ PROGBITS 0000000000000000 00000264
000000000000002b 0000000000000000 E 0 0 1
[13] .gnu.lto_.refs.55 PROGBITS 0000000000000000 0000028f
000000000000000e 0000000000000000 E 0 0 1
[14] .gnu.lto_.decls.5 PROGBITS 0000000000000000 0000029d
00000000000001a7 0000000000000000 E 0 0 1
[15] .gnu.lto_.symtab. PROGBITS 0000000000000000 00000444
0000000000000026 0000000000000000 E 0 0 1
[16] .gnu.lto_.opts PROGBITS 0000000000000000 0000046a
000000000000009a 0000000000000000 E 0 0 1
[17] .note.GNU-stack PROGBITS 0000000000000000 00000504
0000000000000000 0000000000000000 0 0 1
[18] .symtab SYMTAB 0000000000000000 00000508
00000000000001e0 0000000000000018 19 18 8
[19] .strtab STRTAB 0000000000000000 000006e8
000000000000001d 0000000000000000 0 0 1
[20] .shstrtab STRTAB 0000000000000000 00000705
00000000000001c8 0000000000000000 0 0 1
Is this a gcc LTO bug?
