https://sourceware.org/bugzilla/show_bug.cgi?id=32083
Bug ID: 32083
Summary: lto1: fatal error: multiple prevailing defs for ‘func’
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
When linker sees a common symbol, foo, if there is foo in an archive, linker
calls elf_link_is_defined_archive_symbol to check if foo is a definition. Since
elf_link_is_defined_archive_symbol calls plugin_object_p to check if the LTO
plugin
can claim the archive member. When plugin_call_all_symbols_read is called, all
symbols from claimed LTO objects are returned, including the unused archive
member.
Since liby.a appears twice on the command line, we get ultiple prevailing defs
error:
[hjl@gnu-cfl-3 lto-2]$ cat exec.c
#include <stdio.h>
int foo;
int main()
{
if (foo == 1)
printf ("PASS\n");
return 0;
}
[hjl@gnu-cfl-3 lto-2]$ cat y.c
int foo;
void
func (void)
{
}
[hjl@gnu-cfl-3 lto-2]$ make y
gcc -B./ -fcommon -flto -c -o exec.o exec.c
gcc -B./ -fcommon -flto -c -o y.o y.c
ar -rv liby.a y.o
ar: creating liby.a
a - y.o
gcc -B./ -fcommon -flto -o y exec.o liby.a liby.a
lto1: fatal error: multiple prevailing defs for ‘func’
compilation terminated.
lto-wrapper: fatal error: gcc returned 1 exit status
compilation terminated.
./ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make: *** [Makefile:20: y] Error 1
rm y.o
[hjl@gnu-cfl-3 lto-2]$
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