[Bug lto/86517] relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object with LTO

hubicka at ucw dot cz gcc-bugzilla@gcc.gnu.org
Sat Jul 14 10:18:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86517

--- Comment #2 from Jan Hubicka <hubicka at ucw dot cz> ---
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86517
> 
> H.J. Lu <hjl.tools at gmail dot com> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>              Status|UNCONFIRMED                 |RESOLVED
>                  CC|                            |hjl.tools at gmail dot com
>          Resolution|---                         |INVALID
> 
> --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
> I(In reply to Martin Liška from comment #0)
> 
> > 
> > $ gcc -flto -c -fPIE -O2 1.i 2.i && gcc -fPIC -c -O2 lib.i -flto && ar rv
> > x.a lib.o && gcc -pie -O2 -pthread -ldl -lxml2 1.o 2.o x.a -rdynamic -flto=9
> > -shared
> > r - lib.o
> 
> I don't believe you can build a shared object with -fPIE and linker tells
> you to recompile with -fPIC.

I think the problem here is that you can compile PIE and PIC object into pie
binary
at least on x86-64, but the way we merge options in lto-wrapper, we disable
both PIE and
PIC at LTO linktime.
I think we ought to consider PIE as lower variant of PIC and resolve such funny
combination as -fPIE.

Honza


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