LLVM Cross-Compiler: Difference between revisions

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For GIT, in bash:
For GIT, in bash:


<source lang="bash">
<syntaxhighlight lang="bash">
mkdir crossllvm
mkdir crossllvm
cd crossllvm
cd crossllvm
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cd ../projects
cd ../projects
git clone http://llvm.org/git/compiler-rt.git
git clone http://llvm.org/git/compiler-rt.git
</syntaxhighlight>
</source>


For SVN, in bash:
For SVN, in bash:


<source lang="bash">
<syntaxhighlight lang="bash">
mkdir crossllvm
mkdir crossllvm
cd crossllvm
cd crossllvm
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cd ../projects
cd ../projects
svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
</syntaxhighlight>
</source>


=== Building from sources (Possibly Unstable) ===
=== Building from sources (Possibly Unstable) ===
After having checked out the sources (see above), in bash, from the "crossllvm" directory:
After having checked out the sources (see above), in bash, from the "crossllvm" directory:
<source lang="bash">
<syntaxhighlight lang="bash">
mkdir build
mkdir build
cd build
cd build
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make
make
make install
make install
</syntaxhighlight>
</source>


Note: This Autoconf build has been removed from current versions of the LLVM build. All new builds must use CMake.
Note: This Autoconf build has been removed from current versions of the LLVM build. All new builds must use CMake.
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Or with CMake (adjust the source path as needed):
Or with CMake (adjust the source path as needed):


<source lang="bash">
<syntaxhighlight lang="bash">
mkdir build
mkdir build
cd build
cd build
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make
make
make install
make install
</syntaxhighlight>
</source>


Now you have got LLVM and Clang built!
Now you have got LLVM and Clang built!
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=== Debian ===
=== Debian ===
Open a terminal
Open a terminal
<source lang="bash">
<syntaxhighlight lang="bash">
sudo apt-get install clang
sudo apt-get install clang
</syntaxhighlight>
</source>
Note, you might have to disable host functionality. See Useful Flags
Note, you might have to disable host functionality. See Useful Flags


== Building libc++ ==
== Building libc++ ==


<source lang="bash">
<syntaxhighlight lang="bash">
$ git clone http://llvm.org/git/libcxx.git
$ git clone http://llvm.org/git/libcxx.git
$ export TRIPLE=-apple-
$ export TRIPLE=-apple-
$ cd libcxx/lib
$ cd libcxx/lib
$ ./buildit
$ ./buildit
</syntaxhighlight>
</source>


Built libc++ is not installed by default, you can use make install or copy files manually.
Built libc++ is not installed by default, you can use make install or copy files manually.
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For example, for cross compiling to ARM, you can use
For example, for cross compiling to ARM, you can use
<source lang="bash">
<syntaxhighlight lang="bash">
-march=armv7-a -mfloat-abi=soft -ccc-host-triple arm-elf
-march=armv7-a -mfloat-abi=soft -ccc-host-triple arm-elf
</syntaxhighlight>
</source>
Since 3.1, it can be shortened to
Since 3.1, it can be shortened to
<source lang="bash">
<syntaxhighlight lang="bash">
-target armv7--eabi -mcpu=cortex-a9
-target armv7--eabi -mcpu=cortex-a9
</syntaxhighlight>
</source>
An example for compiling to a generic X86 ELF target would be:
An example for compiling to a generic X86 ELF target would be:
<source lang="bash">
<syntaxhighlight lang="bash">
--target=i686-pc-none-elf -march=i686
--target=i686-pc-none-elf -march=i686
</syntaxhighlight>
</source>


=== Useful Flags ===
=== Useful Flags ===
Retrieved from "https://osdev.wiki/wiki/LLVM_Cross-Compiler"