https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98702
Bug ID: 98702
Summary: linker failure with a very simple testing case for
gcc10
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: qinzhao at gcc dot gnu.org
Target Milestone: ---
Created attachment 49980
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49980&action=edit
tar file that can repeat the failure
with gcc10.2.1, the following simple testing case failed during linking:
[qinzhao@localhost 32383604]$ cat t.h
int NUMERRS;
[qinzhao@localhost 32383604]$ cat t.c
#include "t.h"
[qinzhao@localhost 32383604]$ cat t1.c
#include "t.h"
int main()
{
NUMERRS = 0;
return 0;
}
[qinzhao@localhost 32383604]$ /home/qinzhao/Install/latest-10/bin/gcc t.c -c -o
t.o
[qinzhao@localhost 32383604]$ /home/qinzhao/Install/latest-10/bin/gcc t1.c -c
-o t1.o
[qinzhao@localhost 32383604]$ /home/qinzhao/Install/latest-10/bin/gcc t.o t1.o
-o exe.gcc10
t1.o:(.bss+0x0): multiple definition of `NUMERRS'
t.o:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
[qinzhao@localhost 32383604]$
gcc8 and gcc9 do not have this issue.
by examine the object file, I can see gcc10 generate NUMERRS to .bss section,
but gcc8 and gcc9 generate NUMERRS to COM section.
is this a new bug in gcc10?
