[PATCH] D23326: [ELF] - Linkerscript: reimplemented output sections constrains matching functionality.

[George Rimar via llvm-commits]

grimar created this revision.
grimar added reviewers: ruiu, rafael.
grimar added subscribers: llvm-commits, grimar, evgeny777, davide.
Herald added a subscriber: emaste.

Previously filtering that was used worked incorrectly. 
For example for next script it would just remove both sections completely:

SECTIONS { 
. = 0x1000;
.aaa : ONLY_IF_RW { *(.aaa.*) } 
. = 0x2000;
.aaa : ONLY_IF_RO { *(.aaa.*) } 
}

Patch fixes above issues and adds testcase showing the issue. Testcase is a subset of
FreeBSD script which has:
```
.eh_frame       : ONLY_IF_RO { KEEP (*(.eh_frame)) }
...
.eh_frame       : ONLY_IF_RW { KEEP (*(.eh_frame)) }
```

As a side result of a change, behavior of these commands is looks to be equal with ld now.

https://reviews.llvm.org/D23326

Files:
  ELF/LinkerScript.cpp
  ELF/LinkerScript.h
  test/ELF/linkerscript/linkerscript-multi-sections-constraint.s
  test/ELF/linkerscript/linkerscript-sections-constraint.s

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