Compiling Lean with Split Stacks

Split stacks is a relatively new feature in gcc. It allows the stack to grown automatically as needed. There is a small performance penalty since the program stack is stored in the heap. However, we can have multiple threads, each starting with a small stack, and have the stack grow and shrink as required by the program.

In principle, it is possible to build a program that uses split-stacks with libraries that do not. However, it did not work in our experiments. To be able to compile Lean with split-stacks, we also have to compile GMP, MPFR and Lua using split-stacks.

We also had to use the gold linker.

Gold linker

The gold linker is called ld.gold (in our test system). On Ubuntu, you can install it by executing

sudo apt-get install binutils-gold

Before we compiled GMP, MPFR, Lua, and Lean, we created an alias

alias ld=ld.gold

If everything is working correctly, when we execute ld --version, we should get an output like the following one:

GNU gold (GNU Binutils for Ubuntu 2.22) 1.11
Copyright 2011 Free Software Foundation, Inc.
...

Compiling GMP using split-stacks

Download GMP from https://gmplib.org; uncompress the gmp tar-ball at $HOME/tools; and configure it using

  ./configure CFLAGS=-fsplit-stack --prefix=$HOME/tools/split-stack --enable-static

Then, build and install using

  make
  make install

We should have the file libgmp.a at $HOME/tools/split-stack/lib.

Compiling MPFR using split-stacks

Download MPFR from http://www.mpfr.org/; uncompress the mpfr tar-ball at $HOME/tools; and configure it using

  ./configure CFLAGS=-fsplit-stack --prefix=$HOME/tools/split-stack --with-gmp-include=$HOME/tools/split-stack/include --with-gmp-lib=$HOME/tools/split-stack/lib --enable-static

Make sure MPFR does not produce any warning/error message. Then, build and install using:

  make
  make install

We should have the file libmpfr.a at $HOME/tools/split-stack/lib.

Compiling Lua using split-stacks

Download Lua from http://www.lua.org/; uncompress the Lua tar-ball at $HOME/tools. Then, modify the following line in the file src/Makefile in the Lua directory.

   CFLAGS= -O2 -Wall -DLUA_COMPAT_ALL $(SYSCFLAGS) $(MYCFLAGS)

We should include the option -fsplit-stack

   CFLAGS= -O2 -fsplit-stack -Wall -DLUA_COMPAT_ALL $(SYSCFLAGS) $(MYCFLAGS)

Then, build and install using

   make linux
   make linux install INSTALL_TOP=$HOME/tools/split-stack

We should have the file liblua.a at $HOME/tools/split-stack/lib.

Compiling Lean using split-stacks

Go to the Lean directory, and create the folder build/release

  mkdir build/release

Configure Lean using

  cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_CXX_COMPILER=g++ -D TCMALLOC=OFF -D LUA_LIBRARIES=$HOME/tools/split-stack/lib/liblua.a -D LUA_INCLUDE_DIR=$HOME/tool/split-stack/include -D GMP_INCLUDE_DIR=$HOME/tools/split-stack/include -D GMP_LIBRARIES=$HOME/tools/split-stack/lib/libgmp.a -D MPFR_LIBRARIES=$HOME/tools/split-stack/lib/libmpfr.a ../../src

Remark: if you have ninja build tool installed in your system, you can also provide -G Ninja

Then, build using

  make

and, test it

  yes "C" | ctest

The Lean executable will be located at build/release/shell/lean.

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