[Bug ld/16746] New: ld complains about .gnu.warning symbols referenced by linker plugin inputs

[rguenth at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16746

            Bug ID: 16746
           Summary: ld complains about .gnu.warning symbols referenced by
                    linker plugin inputs
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: rguenth at gcc dot gnu.org

t.c
---
extern void foobar (void);
int
main (int argc, char **argv)
{
  if (__builtin_constant_p (argc))
    foobar ();
  return 0;
}

t2.c
---
static const char __evoke_link_warning_foobar[]
 __attribute__ ((used, section (".gnu.warning.foobar\n\t#")))
 = "foobar";

> gcc -c t2.c
> gcc t.c t2.o -O -flto
/tmp/cctYGzQc.o (symbol from plugin): warning: foobar

the symbol table from the t.o input claimed by lto-plugin contains
a reference to foobar () - which is the point LD already warns - but
the replacement object fed from lto-plugin to the linker doesn't contain
this reference anymore.

Thus, LD shouldn't complain about references in files claimed by a
linker plugin but only about references in files provided by the
linker plugin.

This works correctly with gold.

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