[Bug gold/21676] New: Gold doesn't support INSERT in linker script

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21676

            Bug ID: 21676
           Summary: Gold doesn't support INSERT in linker script
           Product: binutils
           Version: 2.29 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: hjl.tools at gmail dot com
                CC: ian at airs dot com
  Target Milestone: ---

'INSERT [ AFTER | BEFORE ] OUTPUT_SECTION'
     This command is typically used in a script specified by '-T' to
     augment the default 'SECTIONS' with, for example, overlays.  It
     inserts all prior linker script statements after (or before)
     OUTPUT_SECTION, and also causes '-T' to not override the default
     linker script.  The exact insertion point is as for orphan
     sections.  *Note Location Counter::.  The insertion happens after
     the linker has mapped input sections to output sections.  Prior to
     the insertion, since '-T' scripts are parsed before the default
     linker script, statements in the '-T' script occur before the
     default linker script statements in the internal linker
     representation of the script.  In particular, input section
     assignments will be made to '-T' output sections before those in
     the default script.  Here is an example of how a '-T' script using
     'INSERT' might look:

          SECTIONS
          {
            OVERLAY :
            {
              .ov1 { ov1*(.text) }
              .ov2 { ov2*(.text) }
            }
          }
          INSERT AFTER .text;

address@hidden gold]$ cat x.s 
        .text
        .globl  foo
foo:
        .dc.a xxx

        .section .bar,"a",%progbits
        .globl bar
bar:
        .dc.a xxx
address@hidden gold]$ cat x.t
SECTIONS
{
   .bar : { *(.bar) }
}
INSERT AFTER .rela.dyn;
address@hidden gold]$ gcc -c x.s
address@hidden gold]$ ld -shared -T x.t x.o
address@hidden gold]$ readelf -SW a.out 
There are 12 section headers, starting at offset 0x1238:

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg
Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00     
0   0  0
  [ 1] .hash             HASH            0000000000000120 000120 000030 04   A 
2   0  8
  [ 2] .dynsym           DYNSYM          0000000000000150 000150 0000a8 18   A 
3   1  8
  [ 3] .dynstr           STRTAB          00000000000001f8 0001f8 000025 00   A 
0   0  1
  [ 4] .rela.dyn         RELA            0000000000000220 000220 000030 18   A 
2   0  8
  [ 5] .bar              PROGBITS        0000000000000250 000250 000008 00   A 
0   0  1
  [ 6] .text             PROGBITS        0000000000000258 000258 000008 00  AX 
0   0  1
  [ 7] .eh_frame         PROGBITS        0000000000000260 000260 000000 00   A 
0   0  8
  [ 8] .dynamic          DYNAMIC         0000000000200f10 000f10 0000f0 10  WA 
3   0  8
  [ 9] .symtab           SYMTAB          0000000000000000 001000 000198 18    
10  11  8
  [10] .strtab           STRTAB          0000000000000000 001198 000044 00     
0   0  1
  [11] .shstrtab         STRTAB          0000000000000000 0011dc 000059 00     
0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  l (large), p (processor specific)
address@hidden gold]$

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