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George Rimar 147747ab0b Revert or r256638. I`ve lost a little piece of code when resolved conflicts right before commit. Sorry about that. 
Test did not catch this either, so I`ll improve it and recommit later.

Original commit message:
[ELF] - Optimize .eh_frame section: remove CIE if all FDEs referencing it were removed.

This patch performs little optimization for eh_frame section.
If all FDE`s that referenced CIE are removed then CIE is also removed from output. 
That can happen for example when dropping FDEs that point to dropped sections. Testcase showing that is included.
The same optimization was added to ld about 14 years ago: https://sourceware.org/ml/binutils/2001-12/msg00144.html, gold does not do that it seems.

Differential revision: http://reviews.llvm.org/D15564

llvm-svn: 256693
 		2016-01-02 16:55:01 +00:00
..
CMakeLists.txt ELF2: Implement --gc-sections. 2015-10-22 18:49:53 +00:00
Config.h [ELF][MIPS] Handle R_MIPS_HI16/LO16 relocations against _gp_disp symbol 2015-12-16 14:45:09 +00:00
Driver.cpp Factor out static members from DefinedRegular. 2015-12-25 06:12:18 +00:00
Driver.h Simplify the InputFile type hierarchy. 2015-10-12 01:55:32 +00:00
DriverUtils.cpp Update lld to match llvm r250901. OptTable constructor now takes an ArrayRef. NFC 2015-10-21 16:31:56 +00:00
Error.cpp [ELF2] Output of all unknown arguments instead of only one. 2015-09-24 18:55:33 +00:00
Error.h [ELF2] Output of all unknown arguments instead of only one. 2015-09-24 18:55:33 +00:00
InputFiles.cpp [ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations 2015-12-25 13:02:13 +00:00
InputFiles.h [ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations 2015-12-25 13:02:13 +00:00
InputSection.cpp [ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations 2015-12-25 13:02:13 +00:00
InputSection.h [ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations 2015-12-25 13:02:13 +00:00
LinkerScript.cpp [ELF] Lookup INPUT argument in the current directory 2015-11-26 20:23:46 +00:00
MarkLive.cpp Delete DefinedAbsolute. 2015-12-24 14:22:24 +00:00
Options.td Add --version-script= alias for --version-script 2015-12-10 14:08:45 +00:00
OutputSections.cpp Revert or r256638. I`ve lost a little piece of code when resolved conflicts right before commit. Sorry about that. 2016-01-02 16:55:01 +00:00
OutputSections.h Do not use SpecificBumpPtrAllocator to create output sections. 2015-12-26 07:01:26 +00:00
README.md [README] Update to reflect the new world order. 2015-12-24 10:03:46 +00:00
SymbolTable.cpp Factor out static members from DefinedRegular. 2015-12-25 06:12:18 +00:00
SymbolTable.h Simplify memory management. 2015-12-23 14:35:51 +00:00
Symbols.cpp Factor out static members from DefinedRegular. 2015-12-25 06:12:18 +00:00
Symbols.h Add comments. 2015-12-25 06:55:39 +00:00
Target.cpp [ELF][MIPS] Implement R_MIPS_GPREL16/R_MIPS_GPREL32 relocations 2015-12-25 13:02:13 +00:00
Target.h [ELF] - Implemented R_*_IRELATIVE relocations for x86, x64 targets. 2015-12-21 10:12:06 +00:00
Writer.cpp Split Writer::assignAddresses. NFC. 2015-12-26 10:52:26 +00:00
Writer.h ELF2: Implement --gc-sections. 2015-10-22 18:49:53 +00:00

README.md

The New ELF Linker

This directory contains a port of the new PE/COFF linker for ELF.

Overall Design

See COFF/README.md for details on the design. Note that unlike COFF, we do not distinguish chunks from input sections; they are merged together.

Capabilities

This linker can link LLVM and Clang on Linux/x86-64 or FreeBSD/x86-64 "Hello world" can be linked on Linux/PPC64 and on Linux/AArch64 or FreeBSD/AArch64.

Performance

Achieving good performance is one of our goals. It's too early to reach a conclusion, but we are optimistic about that as it currently seems to be faster than GNU gold. It will be interesting to compare when we are close to feature parity.