[Bug ld/19008] New: symbol references from notes sections result in errors with -gc-sections

[andi-bz at firstfloor dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19008

            Bug ID: 19008
           Summary: symbol references from notes sections result in errors
                    with -gc-sections
           Product: binutils
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: andi-bz at firstfloor dot org
  Target Milestone: ---

Since some time I get boot strap errors with gcc on systems with systemtap
installed. It fails when linking libsupc++ like this (PR60946).

systemtap sets up some complicated data structures in notes to describe trace
points.

`_.stapsdt.base' referenced in section `.note.stapsdt' of
../libsupc++/.libs/libsupc++convenience.a(eh_catch.o): defined in discarded
section `.stapsdt.base[.stapsdt.base]' of
../libsupc++/.libs/libsupc++convenience.a(eh_catch.o)
`_.stapsdt.base' referenced in section `.note.stapsdt' of
../libsupc++/.libs/libsupc++convenience.a(eh_throw.o): defined in discarded
section `.stapsdt.base[.stapsdt.base]' of
../libsupc++/.libs/libsupc++convenience.a(eh_catch.o)
`_.stapsdt.base' referenced in section `.note.stapsdt' of
../libsupc++/.libs/libsupc++convenience.a(eh_throw.o): defined in discarded
section `.stapsdt.base[.stapsdt.base]' of
../libsupc++/.libs/libsupc++convenience.a(eh_catch.o)
collect2: error: ld returned 1 exit status

I can work around it by commenting use use of -gc-sections for libstdc++.

This seems like a bug. Even with gc-sections symbol references from notes
sections should not result in an error.

GNU ld version 2.25-8.fc22

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