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Fangrui Song e05ca38101 [ELF] Don't emit dynamic relocations with weak undef in writable sections 
In processRelocAux(), our handling of 1) link-time constant and 2) weak
undef is the same, so put them together to simplify the logic.

This moves the weak undef code around. The result is that: in a writable
section (or -z notext), we will no longer emit dynamic relocations for
weak undefined symbols.

The new behavior seems to match GNU linkers, and improves consistency
with the case of a readonly section.

The condition `!Config->Shared` was there probably because it is common
for a -shared link not to specify full dependencies. Keep it now but we
may revisit the decision in the future.

gABI says:

> The behavior of weak symbols in areas not specified by this document is
> implementation defined. Weak symbols are intended primarily for use in
> system software. Applications using weak symbols are unreliable since
> changes in the runtime environment might cause the execution to fail.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D63003

llvm-svn: 363399
 		2019-06-14 14:09:15 +00:00
..
COFF lld/coff: slightly simplify ImportFile::parse() 2019-06-14 14:03:08 +00:00
Common [lld] Allow args::getInterger to parse args larger than 2^31-1 2019-06-07 06:05:26 +00:00
ELF [ELF] Don't emit dynamic relocations with weak undef in writable sections 2019-06-14 14:09:15 +00:00
MinGW [Driver] Look for -m in response files as well 2019-06-10 20:10:10 +00:00
cmake/modules [CMake] Properly conditionalize installation of lld libraries 2018-03-09 13:09:36 +00:00
docs Add --undefined-glob which is an --undefined with wildcard pattern match 2019-06-14 14:00:59 +00:00
include/lld [lld] Allow args::getInterger to parse args larger than 2^31-1 2019-06-07 06:05:26 +00:00
lib Use llvm::stable_sort 2019-04-23 02:42:06 +00:00
test [ELF] Don't emit dynamic relocations with weak undef in writable sections 2019-06-14 14:09:15 +00:00
tools/lld Fix -DBUILD_SHARED_LIBS=on build after r362977 2019-06-11 01:50:58 +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 [WebAssembly] Fix for discarded init functions 2019-06-07 06:00:46 +00:00
.arcconfig [lld] Set up .arcconfig to point to new Diffusion LLD repository 2017-12-06 20:56:23 +00:00
.clang-format
…
.gitignore
…
CMakeLists.txt [WebAssembly] Initial wasm linker implementation 2017-11-17 18:14:09 +00:00
CODE_OWNERS.TXT [WebAssembly] Initial wasm linker implementation 2017-11-17 18:14:09 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md Note that the test .tar.xz has been updated. 2017-12-22 19:37:32 +00:00

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.