[Bug ld/19162] New: Huge binary after linking sections with "a" and "wa" flags

[iverbin at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19162

            Bug ID: 19162
           Summary: Huge binary after linking sections with "a" and "wa"
                    flags
           Product: binutils
           Version: 2.26 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: iverbin at gmail dot com
  Target Milestone: ---

The testcase:

$ cat t1.s
.section ".AAA", "a"
.long 0x12345678
$ cat t2.s
.section ".AAA", "wa"
.long 0x12345678
$ as t1.s -o t1.o
$ as t2.s -o t2.o
$ ld -shared t1.o t2.o
$ ls -lh a.out
2.1M a.out

Some strange 2MB offset is inserted into another section:

[Nr] Name              Type             Address           Offset
     Size              EntSize          Flags  Link  Info  Align
[ 0]                   NULL             0000000000000000  00000000
     0000000000000000  0000000000000000           0     0     0
[ 1] .hash             HASH             00000000000000b0  000000b0
     0000000000000028  0000000000000004   A       2     0     8
[ 2] .dynsym           DYNSYM           00000000000000d8  000000d8
     0000000000000078  0000000000000018   A       3     2     8
[ 3] .dynstr           STRTAB           0000000000000150  00000150
     0000000000000019  0000000000000000   A       0     0     1
[ 4] .AAA              PROGBITS         0000000000000169  00000169
     0000000000000008  0000000000000000  WA       0     0     1
[ 5] .eh_frame         PROGBITS         0000000000000178  00000178
     0000000000000000  0000000000000000   A       0     0     8
[ 6] .dynamic          DYNAMIC          0000000000200178  00200178  <-- ???
     00000000000000b0  0000000000000010  WA       3     0     8

It seems that something goes wrong during section-to-segment mapping, because
when both .AAA have "wa" flags, we got small binary with 2 LOAD segments:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x00000000000001a8 0x00000000000001a8  R      200000
  LOAD           0x00000000000001a8 0x00000000002001a8 0x00000000002001a8
                 0x00000000000000b8 0x00000000000000b8  RW     200000

But when one .AAA has "a" flag, and another .AAA has "wa" flag, we got huge
binary with only one big LOAD segment:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000200228 0x0000000000200228  RW     200000

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