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llvm-project/lld
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Fangrui Song c513360662 [MC] Emit unused undefined symbol even if its binding is not set 
For the following two cases, we currently suppress the symbols. This
patch emits them (compatible with GNU as).

* `test2_a = undef`: if `undef` is otherwise unused.
* `.hidden hidden`: if `hidden` is unused. This is the main point of the
  patch, because omitting the symbol would cause a linker semantic
  difference.

It causes a behavior change that is not compatible with GNU as:

.weakref foo1, bar1

When neither foo1 nor bar1 is used, we now emit bar1, which is arguably
more consistent.

Another change is that we will emit .TOC. for .TOC.@tocbase .  For this
directive, suppressing .TOC. can be seen as a size optimization, but we
choose to drop it for simplicity and consistency.

llvm-svn: 373168
 		2019-09-29 15:26:12 +00:00
..
COFF [LLD] [COFF] Use the unified llvm demangle frontend function. NFC. 2019-09-27 12:23:45 +00:00
Common [LLD] Simplify the demangleItanium function. NFC. 2019-09-27 12:24:18 +00:00
ELF [LLD] Simplify the demangleItanium function. NFC. 2019-09-27 12:24:18 +00:00
MinGW [MinGW] Correct handling different forms of a few options 2019-08-14 09:35:44 +00:00
cmake/modules [CMake] Properly conditionalize installation of lld libraries 2018-03-09 13:09:36 +00:00
docs [ELF] Add -z separate-loadable-segments to complement separate-code and noseparate-code 2019-09-25 03:39:31 +00:00
include/lld [LLD] Simplify the demangleItanium function. NFC. 2019-09-27 12:24:18 +00:00
lib [lld][mach-o] Avoid segfaulting when handling an empty section list. 2019-09-26 17:03:20 +00:00
test [MC] Emit unused undefined symbol even if its binding is not set 2019-09-29 15:26:12 +00:00
tools/lld Fix build breakage on Darwin. 2019-07-11 06:12:18 +00:00
unittests Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [LLD] Simplify the demangleItanium function. NFC. 2019-09-27 12:24:18 +00:00
.arcconfig
…
.clang-format
…
.gitignore
…
CMakeLists.txt [CMake] Don't set Python_ADDITIONAL_VERSIONS 2019-07-18 15:17:42 +00:00
CODE_OWNERS.TXT
…
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md
…

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.