[Bug ld/31171] New: ld generates gratuitous PLT entries on ARM

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=31171

            Bug ID: 31171
           Summary: ld generates gratuitous PLT entries on ARM
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: bugdal at aerifal dot cx
  Target Milestone: ---

This looks like it may be the same as
https://sourceware.org/bugzilla/show_bug.cgi?id=22374 for other archs. I was
testing with the program:

#include <stdlib.h>
static void (*f)() = abort;
int main() {
        return (long)f;
}

built with -O0 so there's no attempt at determining that f doesn't change and
inlining it. The emitted asm and .o file clearly do not contain any references
to abort from .text; however, the linked executable has JUMP_SLOT relocations
and abort@plt instructions.

Both 32-bit arm and aarch64 are affected.

The condition for generating a PLT entry (and analogously, for data, a copy
relocation) should be that the symbol is referenced from text, not that it's a
function-type symbol being referenced at all. References from data do not need
PLT entries or copy relocations.

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