[Bug ld/25315] New: `__tcf_0' referenced in section `.rodata._ZNK6common26ChainResidueAtomDescriptor3strB5cxx11Ev.cst4' of mode_query_balls_distances.o: defined in discarded section `.text.__tcf_0[_ZNK6common26ChainResidueAtomDescriptor3strB5cxx11Ev]' of mode_query_balls_dis

[danglin at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25315

            Bug ID: 25315
           Summary: `__tcf_0' referenced in section
                    `.rodata._ZNK6common26ChainResidueAtomDescriptor3strB5
                    cxx11Ev.cst4' of mode_query_balls_distances.o: defined
                    in discarded section
                    `.text.__tcf_0[_ZNK6common26ChainResidueAtomDescriptor
                    3strB5cxx11Ev]' of mode_query_balls_dis
           Product: binutils
           Version: 2.33
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: danglin at gcc dot gnu.org
                CC: deller at gmx dot de
  Target Milestone: ---
              Host: hppa-unknown-linux-gnu
            Target: hppa-unknown-linux-gnu
             Build: hppa-unknown-linux-gnu

The Debian voronota package fails to build on hppa-linux with gcc-9:
https://buildd.debian.org/status/fetch.php?pkg=voronota&arch=hppa&ver=1.20.2710-1&stamp=1577116832&raw=0

I'm unsure whether this is a gcc or binutils issue.  I am fairly sure this
problem was introduced by a change to pa_reloc_rw_mask().  We now allow relocs
in read-only data in non-pic code.  However, it seems a section can be
discarded even though there is a plabel reference to it.

        .section       
.text.__tcf_0,"axG",@progbits,_ZNK6common26ChainResidueAtomDescriptor3strB5cxx11Ev,comdat
        .align 4
        .type   __tcf_0, @function
__tcf_0:
        .PROC
        .CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=4
        .ENTRY
.LFB4043:
        .loc 2 371 120 is_stmt 1 view -0
        .cfi_startproc
        stw %r2,-20(%r30)


        .section       
.rodata._ZNK6common26ChainResidueAtomDescriptor3strB5cxx
11Ev.cst4,"aM",@progbits,4
        .align 4
.LC33:
        .word   P%_ZN6common26ChainResidueAtomDescriptor12MarkerNamingD1Ev
        .align 4
.LC34:
        .word   P%__tcf_0
        .align 4
.LC35:
        .word  
P%_ZNSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS5_EED1Ev

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