[Bug target/68662] [6 regression] FAIL: gcc.dg/lto/20090210 c_lto_20090210_0.o-c_lto_20090210_1.o link, -O2 -flto -flto-partition=none -fuse-linker-plugin -fno-fat-lto-objects

[amodra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68662

--- Comment #13 from Alan Modra <amodra at gcc dot gnu.org> ---
Author: amodra
Date: Tue Feb  2 00:01:16 2016
New Revision: 233061

URL: https://gcc.gnu.org/viewcvs?rev=233061&root=gcc&view=rev
Log:
[RS6000] ABI_V4 init of toc section

Since 4c4a180d lto has turned off flag_pic when linking a fixed
position executable.  So flag_pic is zero in rs6000_file_start.
However, when we get to actually emitting code, flag_pic may be on
again.  This results in undefined references to ".LCTOC1".

        PR target/68662
        * config/rs6000/rs6000.c (need_toc_init): New var, set it
        whenever toc_label_name used.
        (rs6000_file_start): Don't set up toc section here,
        (rs6000_output_function_epilogue): do so here instead,
        (rs6000_xcoff_file_start): and here.
        * config/rs6000/rs6000.md (load_toc_aix_si): Set need_toc_init.
        (load_toc_aix_di): Likewise.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/config/rs6000/rs6000.md