[docs] Some typographical fixes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190324 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sean Silva
parent
c573305bce
commit
7f2576ddb0
|
|
@ -22,15 +22,15 @@ nowadays) to a hard-float ARM target (most ARM targets nowadays).
|
|||
|
||||
The packages you'll need are:
|
||||
|
||||
* cmake
|
||||
* ninja-build (from backports in Ubuntu)
|
||||
* gcc-4.7-arm-linux-gnueabihf
|
||||
* gcc-4.7-multilib-arm-linux-gnueabihf
|
||||
* binutils-arm-linux-gnueabihf
|
||||
* libgcc1-armhf-cross
|
||||
* libsfgcc1-armhf-cross
|
||||
* libstdc++6-armhf-cross
|
||||
* libstdc++6-4.7-dev-armhf-cross
|
||||
* ``cmake``
|
||||
* ``ninja-build`` (from backports in Ubuntu)
|
||||
* ``gcc-4.7-arm-linux-gnueabihf``
|
||||
* ``gcc-4.7-multilib-arm-linux-gnueabihf``
|
||||
* ``binutils-arm-linux-gnueabihf``
|
||||
* ``libgcc1-armhf-cross``
|
||||
* ``libsfgcc1-armhf-cross``
|
||||
* ``libstdc++6-armhf-cross``
|
||||
* ``libstdc++6-4.7-dev-armhf-cross``
|
||||
|
||||
Configuring CMake
|
||||
-----------------
|
||||
|
|
@ -39,32 +39,29 @@ For more information on how to configure CMake for LLVM/Clang,
|
|||
see :doc:`CMake`.
|
||||
|
||||
The CMake options you need to add are:
|
||||
* -DCMAKE_CROSSCOMPILING=True
|
||||
* -DCMAKE_INSTALL_PREFIX=<install-dir>
|
||||
* -DLLVM_TABLEGEN=<path-to-host-bin>/llvm-tblgen
|
||||
* -DCLANG_TABLEGEN=<path-to-host-bin>/clang-tblgen
|
||||
* -DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf
|
||||
* -DLLVM_TARGET_ARCH=ARM
|
||||
* -DLLVM_TARGETS_TO_BUILD=ARM
|
||||
* -DCMAKE_CXX_FLAGS='-target armv7a-linux-gnueabihf -mcpu=cortex-a9
|
||||
-I/usr/arm-linux-gnueabihf/include/c++/4.7.2/arm-linux-gnueabihf/
|
||||
-I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard
|
||||
-ccc-gcc-name arm-linux-gnueabihf-gcc'
|
||||
* ``-DCMAKE_CROSSCOMPILING=True``
|
||||
* ``-DCMAKE_INSTALL_PREFIX=<install-dir>``
|
||||
* ``-DLLVM_TABLEGEN=<path-to-host-bin>/llvm-tblgen``
|
||||
* ``-DCLANG_TABLEGEN=<path-to-host-bin>/clang-tblgen``
|
||||
* ``-DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf``
|
||||
* ``-DLLVM_TARGET_ARCH=ARM``
|
||||
* ``-DLLVM_TARGETS_TO_BUILD=ARM``
|
||||
* ``-DCMAKE_CXX_FLAGS='-target armv7a-linux-gnueabihf -mcpu=cortex-a9 -I/usr/arm-linux-gnueabihf/include/c++/4.7.2/arm-linux-gnueabihf/ -I/usr/arm-linux-gnueabihf/include/ -mfloat-abi=hard -ccc-gcc-name arm-linux-gnueabihf-gcc'``
|
||||
|
||||
The TableGen options are required to compile it with the host compiler,
|
||||
so you'll need to compile LLVM (or at least `llvm-tblgen`) to your host
|
||||
so you'll need to compile LLVM (or at least ``llvm-tblgen``) to your host
|
||||
platform before you start. The CXX flags define the target, cpu (which
|
||||
defaults to fpu=VFP3 with NEON), and forcing the hard-float ABI. If you're
|
||||
defaults to ``fpu=VFP3`` with NEON), and forcing the hard-float ABI. If you're
|
||||
using Clang as a cross-compiler, you will *also* have to set ``-ccc-gcc-name``,
|
||||
to make sure it picks the correct linker.
|
||||
|
||||
Most of the time, what you want is to have a native compiler to the
|
||||
platform itself, but not others. It might not even be feasible to
|
||||
produce x86 binaries from ARM targets, so there's no point in compiling
|
||||
all back-ends. For that reason, you should also set the "TARGETS_TO_BUILD"
|
||||
to only build the ARM back-end.
|
||||
all back-ends. For that reason, you should also set the
|
||||
``TARGETS_TO_BUILD`` to only build the ARM back-end.
|
||||
|
||||
You must set the CMAKE_INSTALL_PREFIX, otherwise a ``ninja install``
|
||||
You must set the ``CMAKE_INSTALL_PREFIX``, otherwise a ``ninja install``
|
||||
will copy ARM binaries to your root filesystem, which is not what you
|
||||
want.
|
||||
|
||||
|
|
@ -76,7 +73,7 @@ running CMake:
|
|||
|
||||
#. If you're using Clang as the cross-compiler, there is a problem in
|
||||
the LLVM ARM back-end that is producing absolute relocations on
|
||||
position-independent code (R_ARM_THM_MOVW_ABS_NC), so for now, you
|
||||
position-independent code (``R_ARM_THM_MOVW_ABS_NC``), so for now, you
|
||||
should disable PIC:
|
||||
|
||||
.. code-block:: bash
|
||||
|
|
@ -88,25 +85,25 @@ running CMake:
|
|||
|
||||
#. The ARM libraries won't be installed in your system, and possibly
|
||||
not easily installable anyway, so you'll have to build/download
|
||||
them separately. But the CMake prepare step, which check for
|
||||
dependencies, will check the `host` libraries, not the `target`
|
||||
them separately. But the CMake prepare step, which checks for
|
||||
dependencies, will check the *host* libraries, not the *target*
|
||||
ones.
|
||||
|
||||
A quick way of getting the libraries is to download them from
|
||||
a distribution repository, like Debian (http://packages.debian.org/wheezy/),
|
||||
and download the missing libraries. Note that the `libXXX`
|
||||
will have the shared objects (.so) and the `libXXX-dev` will
|
||||
give you the headers and the static (.a) library. Just in
|
||||
and download the missing libraries. Note that the ``libXXX``
|
||||
will have the shared objects (``.so``) and the ``libXXX-dev`` will
|
||||
give you the headers and the static (``.a``) library. Just in
|
||||
case, download both.
|
||||
|
||||
The ones you need for ARM are: ``libtinfo``, ``zlib1g``,
|
||||
``libxml2`` and ``liblzma``. In the Debian repository you'll
|
||||
find downloads for all architectures.
|
||||
|
||||
After you download and unpack all `.deb` packages, copy all
|
||||
After you download and unpack all ``.deb`` packages, copy all
|
||||
``.so`` and ``.a`` to a directory, make the appropriate
|
||||
symbolic links (if necessary), and add the relevant ``-L``
|
||||
and ``-I`` paths to -DCMAKE_CXX_FLAGS above.
|
||||
and ``-I`` paths to ``-DCMAKE_CXX_FLAGS`` above.
|
||||
|
||||
|
||||
Running CMake and Building
|
||||
|
|
@ -124,9 +121,9 @@ If you're using Clang as the cross-compiler, run:
|
|||
|
||||
$ CC='clang' CXX='clang++' cmake -G Ninja <source-dir> <options above>
|
||||
|
||||
If you have clang/clang++ on the path, it should just work, and special
|
||||
If you have ``clang``/``clang++`` on the path, it should just work, and special
|
||||
Ninja files will be created in the build directory. I strongly suggest
|
||||
you to run cmake on a separate build directory, *not* inside the
|
||||
you to run ``cmake`` on a separate build directory, *not* inside the
|
||||
source tree.
|
||||
|
||||
To build, simply type:
|
||||
|
|
@ -151,7 +148,7 @@ via:
|
|||
|
||||
$ ninja install
|
||||
|
||||
which will create a sysroot on the install-dir. You can then TarGz
|
||||
which will create a sysroot on the install-dir. You can then tar
|
||||
that directory into a binary with the full triple name (for easy
|
||||
identification), like:
|
||||
|
||||
|
|
@ -160,9 +157,9 @@ identification), like:
|
|||
$ ln -sf <install-dir> arm-linux-gnueabihf-clang
|
||||
$ tar zchf arm-linux-gnueabihf-clang.tar.gz arm-linux-gnueabihf-clang
|
||||
|
||||
If you copy that TarBall to your target board, you'll be able to use
|
||||
If you copy that tarball to your target board, you'll be able to use
|
||||
it for running the test-suite, for example. Follow the guidelines at
|
||||
http://llvm.org/docs/lnt/quickstart.html, unpack the TarBall in the
|
||||
http://llvm.org/docs/lnt/quickstart.html, unpack the tarball in the
|
||||
test directory, and use options:
|
||||
|
||||
.. code-block:: bash
|
||||
|
|
|
|||
Loading…
Reference in New Issue