[Bug ld/23350] multiple prevailing defs for unused variable in lto mode

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23350

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |WAITING

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Martin Liska from comment #3)
> So still present, shows here:
> 
> $ cat main.i
> int wrl;
> 
> $ cat lib.i
> int wrl;
> void a() {}
> 
> $ gcc -c -flto main.i && gcc -c -flto lib.i && ar rusc lib.a lib.o
> $ gcc main.o lib.a lib.a
> lto1: fatal error: multiple prevailing defs for ‘a’
> compilation terminated.
> lto-wrapper: fatal error: gcc returned 1 exit status
> compilation terminated.
> /usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld:
> error: lto-wrapper failed
> collect2: error: ld returned 1 exit status
> 

Linker checks lib.a to see if there is a non-COMMON definition for
wrl.  But linker never includes lib.o in the final link.  What makes
lto1 believe that lib.o is needed?

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