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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/95620] [10/11 Regression] relocation truncated to fit:
 R_X86_64_PC32 against `.bss'
Date: Wed, 10 Jun 2020 06:19:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95620

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
So we basically change assembly in the following way:

$ diff -u good.s bad.s -U999
--- good.s      2020-06-09 23:37:35.755366723 +0200
+++ bad.s       2020-06-09 23:37:36.771361476 +0200
@@ -1,13 +1,13 @@
        .file   "<artificial>"
        .text
        .globl  main
        .type   main, @function
 main:
 .LFB1:
        movl    b(%rip), %edx
 .LFE1:
        .size   main, .-main
-       .local  b
-       .comm   b,4,4
        .local  a
        .comm   a,2430270464
+       .local  b
+       .comm   b,4,4

and logically the relocation for 'b(%rip)' now has to go over the huge 'a'
array.
It's invalid to me, I would recommend using -mcmodel=3Dlarge.=