[Bug ld/22269] New: Undefined weak symbols isn't resolved to 0 in static PIE

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22269

            Bug ID: 22269
           Summary: Undefined weak symbols isn't resolved to 0 in static
                    PIE
           Product: binutils
           Version: 2.30 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
        Depends on: 19636
  Target Milestone: ---
            Target: aarch64

On aarch64:

address@hidden glibc]$ cat x.s
        .text
        .globl _start
_start:
        .byte 0
        .section        .data.rel.ro.local,"aw",%progbits
        .weak func
        .dc.a func
address@hidden glibc]$
/export/gnu/import/git/toolchain/install/compilers/aarch64-linux-gnu/bin/aarch64-glibc-linux-gnu-gcc
-c x.s
address@hidden glibc]$
/export/gnu/import/git/toolchain/install/compilers/aarch64-linux-gnu/bin/aarch64-glibc-linux-gnu-ld
-pie --no-dynamic-linker x.o
address@hidden glibc]$ readelf -r a.out 

Relocation section '.rela.dyn' at offset 0x1a8 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name +
Addend
000000010ec8  000200000101 R_AARCH64_ABS64   0000000000000000 func + 0
address@hidden glibc]$ readelf -l a.out 

Elf file type is DYN (Shared object file)
Entry point 0x1c0
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x00000000000001c1 0x00000000000001c1  R E    0x10000
  LOAD           0x0000000000000ec8 0x0000000000010ec8 0x0000000000010ec8
                 0x0000000000000138 0x0000000000000138  RW     0x10000
  DYNAMIC        0x0000000000000ed0 0x0000000000010ed0 0x0000000000010ed0
                 0x0000000000000110 0x0000000000000110  RW     0x8
  GNU_RELRO      0x0000000000000ec8 0x0000000000010ec8 0x0000000000010ec8
                 0x0000000000000138 0x0000000000000138  R      0x1

 Section to Segment mapping:
  Segment Sections...
   00     .hash .gnu.hash .dynsym .dynstr .rela.dyn .text 
   01     .data.rel.ro .dynamic .got .got.plt 
   02     .dynamic 
   03     .data.rel.ro .dynamic .got .got.plt 
address@hidden glibc]$ 

func should be resolved to 0 by ld.


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=19636
[Bug 19636] -pie changes program behavior and generate unnecessary dynamic
symbols.
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