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Revert "[docs] As of binutils 2.21.51.0.2, ld.bfd supports plugins too, represent this in docs"

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This reverts commit r306102.

This change was made without any review, and has a couple of issues.
First, AFAIK we do not test the combination of the LLVM gold plugin with
ld.bfd. Second, the change removed documentation for how to build gold
and replaced it with instructions for building ld.bfd.

llvm-svn: 336841
This commit is contained in:
Teresa Johnson 2018-07-11 20:08:32 +00:00
parent 9a617ce941
commit 7dcfd8bd26
1 changed files with 11 additions and 9 deletions
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20
docs/GoldPlugin.rst
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@ -7,7 +7,7 @@ Introduction
Building with link time optimization requires cooperation from
the system linker. LTO support on Linux systems requires that you use the
`gold linker`_ or ld.bfd from binutils >= 2.21.51.0.2, as they support LTO via plugins. This is the same mechanism
`gold linker`_ which supports LTO via plugins. This is the same mechanism
used by the `GCC LTO`_ project.
The LLVM gold plugin implements the gold plugin interface on top of
@ -23,22 +23,24 @@ The LLVM gold plugin implements the gold plugin interface on top of
How to build it
===============
Check for plugin support by running ``/usr/bin/ld -plugin``. If it complains
"missing argument" then you have plugin support. If not, such as an "unknown option"
error then you will either need to build gold or install a recent version
of ld.bfd with plugin support and then build gold plugin.
You need to have gold with plugin support and build the LLVMgold plugin.
Check whether you have gold running ``/usr/bin/ld -v``. It will report "GNU
gold" or else "GNU ld" if not. If you have gold, check for plugin support
by running ``/usr/bin/ld -plugin``. If it complains "missing argument" then
you have plugin support. If not, such as an "unknown option" error then you
will either need to build gold or install a version with plugin support.
* Download, configure and build ld.bfd with plugin support:
* Download, configure and build gold with plugin support:
.. code-block:: bash
$ git clone --depth 1 git://sourceware.org/git/binutils-gdb.git binutils
$ mkdir build
$ cd build
$ ../binutils/configure --disable-werror # ld.bfd includes plugin support by default
$ make all-ld
$ ../binutils/configure --enable-gold --enable-plugins --disable-werror
$ make all-gold
That should leave you with ``build/ld/ld-new`` which supports
That should leave you with ``build/gold/ld-new`` which supports
the ``-plugin`` option. Running ``make`` will additionally build
``build/binutils/ar`` and ``nm-new`` binaries supporting plugins.