do not use a recent version of clang (clang-3.9 is fine)

Author: Mathieu Bernard

docs/source/install.rst

@@ -46,10 +46,10 @@ following dependencies: Kaldi, sox, shorten and festival.
 C++ compilers
 -------------
 
-You need to have both ``gcc`` and ``clang`` installed. On
+You need to have both ``gcc`` and ``clang-3.9`` installed. On
 Debian/Ubuntu just have a::
 
-  sudo apt-get install gcc clang
+  sudo apt-get install gcc gfortran clang-3.9
 
 
 Flac, sox and festival

install_kaldi.sh

@@ -55,17 +55,22 @@ kaldi=$(realpath $kaldi/src)
 # From $kaldi/tools/extras/check_dependencies.sh. Debian systems
 # generally link /bin/sh to dash, which doesn't work with some scripts
 # as it doesn't expand x.{1,2}.y to x.1.y x.2.y
-[ $(realpath /bin/sh) == "/bin/dash" ] && \
+[[ $(realpath /bin/sh) == *"dash"* ]] && \
     failure  "failed because /bin/sh is linked to dash, and currently \
          some of the scripts will not run properly. We recommend to run: \
          sudo ln -s -f bash /bin/sh"
 
+# make sure gfortran and clang++-3.9 are installed
+[ -z $(which gfortran) ] && failure "error: gfortran not installed, please install it"
+[ -z $(which clang++-3.9) ] && failure "error: clang++-3.9 not installed, please install it"
+[ -z $(which gawk) ] && failure "error: gawk not installed, please install it"
+
 # compile kaldi tools
 cd $kaldi/tools
 ./extras/check_dependencies.sh || failure "failed to check kaldi dependencies"
 # use clang instead of gcc, and openfst-1.4.1 instead of 1.3.4
 sed -i "s/CXX = g++/# CXX = g++/" Makefile
-sed -i "s/# CXX = clang++/CXX = clang++/" Makefile
+sed -i "s/# CXX = clang++/CXX = clang++-3.9/" Makefile
 sed -i "s/OPENFST_VERSION = 1.3.4/# OPENFST_VERSION = 1.3.4/" Makefile
 sed -i "s/# OPENFST_VERSION = 1.4.1/OPENFST_VERSION = 1.4.1/" Makefile
 make -j $ncores || failure "failed to build kaldi tools"
@@ -79,7 +84,7 @@ cd $kaldi/src
 sed -i "s/\-g # -O0 -DKALDI_PARANOID.*$/-O3 -DNDEBUG/" kaldi.mk
 # use clang instead of gcc
 sed -i "s/ -rdynamic//g" kaldi.mk
-sed -i "s/g++/clang++/" kaldi.mk
+sed -i "s/g++/clang++-3.9/" kaldi.mk
 make depend -j $ncores || failure "failed to setup kaldi dependencies"
 make -j $ncores || failure "failed to build kaldi"