[Bug ld/21593] New: .startof.SECNAME and .sizeof.SECNAME should be local

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21593

            Bug ID: 21593
           Summary: .startof.SECNAME and .sizeof.SECNAME should be local
           Product: binutils
           Version: 2.29 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

address@hidden startof]$ cat x.s
        .section        scnfoo,"aw",%progbits
        .zero 0x10

        .globl  bar
        .data
        .align 8
        .type   bar, %object
        .size   bar, 8
bar:
        .dc.a   __stop_scnfoo
        .dc.a  .sizeof. (scnfoo)
        .dc.a   __start_scnfoo
        .dc.a  .startof. (scnfoo)
address@hidden startof]$ make
as   -o x.o x.s
./ld -shared --gc-sections -o x.so x.o
readelf -sW x.so | grep scnfoo
     1: 0000000000201020     0 NOTYPE  GLOBAL DEFAULT    8 .startof.scnfoo
     6: 0000000000000010     0 NOTYPE  GLOBAL DEFAULT  ABS .sizeof.scnfoo
    10: 0000000000201030     0 NOTYPE  LOCAL  DEFAULT    8 __stop_scnfoo
    11: 0000000000201020     0 NOTYPE  LOCAL  DEFAULT    8 __start_scnfoo
    13: 0000000000201020     0 NOTYPE  GLOBAL DEFAULT    8 .startof.scnfoo
    18: 0000000000000010     0 NOTYPE  GLOBAL DEFAULT  ABS .sizeof.scnfoo
address@hidden startof]$ 

Exporting .startof.SECNAME and .sizeof.SECNAME as dynamic symbols may
lead to unexpected behavior.  Reference to .startof.SECNAME and
.sizeof.SECNAME to section SECNAME within a DSO will be resolved to
.startof.SECNAME and .sizeof.SECNAME in another DSO or executable.

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