llvm-project

History

Rafael Espindola a339e47689 libLTO has a bug in that it will keep every symbol if none is needed. We used to hack around this in the gold plugin by deleting a module if no symbol was needed. Unfortunately, the hack is wrong in the case of o module having no visible symbols but still having side effects via static constructors. The bug will have to be fixed in libLTO itself. llvm-svn: 166745		2012-10-26 00:29:57 +00:00
..
CMakeLists.txt	Use absolute path to exportsfile in gold plugin CMake build.	2011-11-05 04:17:20 +00:00
Makefile	Pass -lLTO after gold-plugin.o so that it gets used in systems that default to	2012-08-27 03:03:07 +00:00
README.txt	s/libLLVMgold/LLVMgold/g	2010-08-08 21:14:26 +00:00
gold-plugin.cpp	libLTO has a bug in that it will keep every symbol if none is needed. We used	2012-10-26 00:29:57 +00:00
gold.exports	…

README.txt

This directory contains a plugin that is designed to work with binutils
gold linker. At present time, this is not the default linker in
binutils, and the default build of gold does not support plugins.

Obtaining binutils:

  cvs -z 9 -d :pserver:anoncvs@sourceware.org:/cvs/src login
  {enter "anoncvs" as the password}
  cvs -z 9 -d :pserver:anoncvs@sourceware.org:/cvs/src co binutils

This will create a src/ directory. Make a build/ directory and from
there configure binutils with "../src/configure --enable-gold --enable-plugins".
Then build binutils with "make all-gold".

To build the LLVMgold plugin, configure LLVM with the option
--with-binutils-include=/path/to/binutils/src/include/ --enable-pic. To use the
plugin, run "ld-new --plugin /path/to/LLVMgold.so".
Without PIC libLTO and LLVMgold are not being built (because they would fail
link on x86-64 with a relocation error: PIC and non-PIC can't be combined).
As an alternative to passing --enable-pic, you can use 'make ENABLE_PIC=1' in
your entire LLVM build.