Beyond Linux® From Scratch - Version 2012-05-20

Chapter 13. Programming

LLVM-3.0

Introduction to LLVM

The llvm package contains a collection of modular and reusable compiler and toolchain technologies. The Low Level Virtual MAchine (LLVM) Core libraries provide a modern source- and target-independent optimizer, along with code generation support for many popular CPUs (as well as some less common ones!) These libraries are built around a well specified code representation known as the LLVM intermediate representation ("LLVM IR").

The optional clang package provides a new C, C++, Objective C and Objective C++ front-end for the LLVM compiler.

This package is known to build and work properly using an LFS-7.1 platform.

Package Information

  • Download (HTTP): http://llvm.org/releases/3.0/llvm-3.0.tar.gz

  • Download MD5 sum: a8e5f5f1c1adebae7b4a654c376a6005

  • Download size: 9.9 MB

  • Estimated disk space required: 265 MB

  • Estimated build time: 13.2 SBU (add about 7 SBU for clang)

Additional Downloads

LLVM Dependencies

Recommended

libffi-3.0.10

Optional

Doxygen-1.7.5 and Graphviz-2.28.0

User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/llvm

Installation of LLVM

If you downloaded the optional clang package, install it into the source tree: 

tar -xf ../clang-3.0.tar.gz -C tools &&
mv tools/clang-3.0.src tools/clang

Install llvm by running the following commands: 

touch tools/edis/EnhancedDisassembly.exports &&

CFLAGS="$CFLAGS -fno-tree-pre"               &&
CXXFLAGS="$CXXFLAGS -fno-tree-pre"           &&

sed -i -e 's:\$(PROJ_prefix)/etc/llvm:/etc/llvm:'                      \
       -e 's:\$(PROJ_prefix)/lib:$(PROJ_prefix)/lib/llvm:'             \
       -e 's:\$(PROJ_prefix)/docs/llvm:$(PROJ_prefix)/share/doc/llvm:' \
       Makefile.config.in  &&

sed -i 's:$(RPATH) -Wl,$(\(ToolDir\|LibDir\|ExmplDir\))::g' Makefile.rules &&

export CPPFLAGS="$CPPFLAGS $(pkg-config --cflags libffi)"                  &&

CC=gcc                                 \
CXX=g++                                \
./configure --prefix=/usr              \
            --libdir=/usr/lib/llvm     \
            --sysconfdir=/etc          \
            --enable-shared            \
            --enable-libffi            \
            --enable-targets=all       \
            --disable-expensive-checks \
            --disable-debug-runtime    \
            --disable-assertions       \
            --enable-optimized        &&

make

To test the results, issue: make check.

Now, as the root user: 

make install

Command Explanations

CFLAGS=... CXXFLAGS=...: Build without -ftree-pre as a workaround for clang segfaulting on x86_64 systems.

sed ... Makefile.config.in: This fixes installation directories.

sed ... Makefile.rules: This fixes an insecure rpath that points ot the build directory.

Contents

Installed Programs: clang, clang++, and numerous llvm-* build tools
Installed Libraries: numerous custom libraries to support llvm and clang programs
Installed Directories: /usr/lib/{clang,llvm}, /usr/share/doc/llvm

Last updated on 2012-05-12 19:33:22 +0000