#!/bin/sh
  # vi: set sw=4 ts=4:
  
  export LC_ALL=C
  
  # Verify that grep works
  echo "WORKS" | grep "WORKS" >/dev/null 2>&1
  if test $? != 0 ; then
  	echo
  	echo "grep doesn't work"
  	exit 1
  fi
  
  # sanity check for CWD in LD_LIBRARY_PATH
  # try not to rely on egrep..
  if test -n "$LD_LIBRARY_PATH" ; then
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep '::' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep ':\.:' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep 'TRiGGER_start:' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep 'TRiGGER_start\.:' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep ':TRiGGER_end' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep ':\.TRiGGER_end' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$LD_LIBRARY_PATH"TRiGGER_end | grep 'TRiGGER_start\.TRiGGER_end' >/dev/null 2>&1
  	if test $? = 0; then
  		echo
  		echo "You seem to have the current working directory in your"
  		echo "LD_LIBRARY_PATH environment variable. This doesn't work."
  		exit 1;
  	fi
  fi;
  
  # sanity check for CWD in PATH. Having the current working directory
  # in the PATH makes the toolchain build process break.
  # try not to rely on egrep..
  if test -n "$PATH" ; then
  	echo TRiGGER_start"$PATH"TRiGGER_end | grep ':\.:' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$PATH"TRiGGER_end | grep 'TRiGGER_start\.:' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$PATH"TRiGGER_end | grep ':\.TRiGGER_end' >/dev/null 2>&1 ||
  	echo TRiGGER_start"$PATH"TRiGGER_end | grep 'TRiGGER_start\.TRiGGER_end' >/dev/null 2>&1
  	if test $? = 0; then
  		echo
  		echo "You seem to have the current working directory in your"
  		echo "PATH environment variable. This doesn't work."
  		exit 1;
  	fi
  fi;
  
  if test -n "$PERL_MM_OPT" ; then
  	echo
  	echo "You have PERL_MM_OPT defined because Perl local::lib"
  	echo "is installed on your system. Please unset this variable"
  	echo "before starting Buildroot, otherwise the compilation of"
  	echo "Perl related packages will fail"
  	exit 1
  fi
  
  check_prog_host()
  {
  	prog="$1"
  	if ! which $prog > /dev/null ; then
  		echo >&2
  		echo "You must install '$prog' on your build machine" >&2
  		exit 1
  	fi
  }
  
  # Verify that which is installed
  check_prog_host "which"
  # Verify that sed is installed
  check_prog_host "sed"
  
  # Check make
  MAKE=$(which make 2> /dev/null)
  if [ -z "$MAKE" ] ; then
  	echo
  	echo "You must install 'make' on your build machine";
  	exit 1;
  fi;
  MAKE_VERSION=$($MAKE --version 2>&1 | sed -e 's/^.* \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q')
  if [ -z "$MAKE_VERSION" ] ; then
  	echo
  	echo "You must install 'make' on your build machine";
  	exit 1;
  fi;
  MAKE_MAJOR=$(echo $MAKE_VERSION | sed -e "s/\..*//g")
  MAKE_MINOR=$(echo $MAKE_VERSION | sed -e "s/^$MAKE_MAJOR\.//g" -e "s/\..*//g" -e "s/[a-zA-Z].*//g")
  if [ $MAKE_MAJOR -lt 3 ] || [ $MAKE_MAJOR -eq 3 -a $MAKE_MINOR -lt 81 ] ; then
  	echo
  	echo "You have make '$MAKE_VERSION' installed.  GNU make >=3.81 is required"
  	exit 1;
  fi;
  
  # Check host gcc
  COMPILER=$(which $HOSTCC_NOCCACHE 2> /dev/null)
  if [ -z "$COMPILER" ] ; then
  	COMPILER=$(which cc 2> /dev/null)
  fi;
  if [ -z "$COMPILER" ] ; then
  	echo
  	echo "You must install 'gcc' on your build machine";
  	exit 1;
  fi;
  
  COMPILER_VERSION=$($COMPILER -v 2>&1 | sed -n '/^gcc version/p' |
  	sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q')
  if [ -z "$COMPILER_VERSION" ] ; then
  	echo
  	echo "You must install 'gcc' on your build machine";
  	exit 1;
  fi;
  COMPILER_MAJOR=$(echo $COMPILER_VERSION | sed -e "s/\..*//g")
  COMPILER_MINOR=$(echo $COMPILER_VERSION | sed -e "s/^$COMPILER_MAJOR\.//g" -e "s/\..*//g")
  if [ $COMPILER_MAJOR -lt 3 -o $COMPILER_MAJOR -eq 2 -a $COMPILER_MINOR -lt 95 ] ; then
  	echo
  	echo "You have gcc '$COMPILER_VERSION' installed.  gcc >= 2.95 is required"
  	exit 1;
  fi;
  
  # check for host CXX
  CXXCOMPILER=$(which $HOSTCXX_NOCCACHE 2> /dev/null)
  if [ -z "$CXXCOMPILER" ] ; then
  	CXXCOMPILER=$(which c++ 2> /dev/null)
  fi
  
  if [ -z "$CXXCOMPILER" ] ; then
  	echo
  	echo "You may have to install 'g++' on your build machine"
  fi
  if [ ! -z "$CXXCOMPILER" ] ; then
  	CXXCOMPILER_VERSION=$($CXXCOMPILER -v 2>&1 | sed -n '/^gcc version/p' |
  		sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q')
  	if [ -z "$CXXCOMPILER_VERSION" ] ; then
  		echo
  		echo "You may have to install 'g++' on your build machine"
  	fi
  fi
  
  if [ -n "$CXXCOMPILER_VERSION" ] ; then
  	CXXCOMPILER_MAJOR=$(echo $CXXCOMPILER_VERSION | sed -e "s/\..*//g")
  	CXXCOMPILER_MINOR=$(echo $CXXCOMPILER_VERSION | sed -e "s/^$CXXCOMPILER_MAJOR\.//g" -e "s/\..*//g")
  	if [ $CXXCOMPILER_MAJOR -lt 3 -o $CXXCOMPILER_MAJOR -eq 2 -a $CXXCOMPILER_MINOR -lt 95 ] ; then
  		echo
  		echo "You have g++ '$CXXCOMPILER_VERSION' installed.  g++ >= 2.95 is required"
  		exit 1
  	fi
  fi
  
  # Check bash
  # We only check bash is available, setting SHELL appropriately is done
  # in the top-level Makefile, and we mimick the same sequence here
  if   [ -n "${BASH}" ]; then :
  elif [ -x /bin/bash ]; then :
  elif [ -z "$( sh -c 'echo $BASH' )" ]; then
  	echo
  	echo "You must install 'bash' on your build machine"
  	exit 1
  fi
  
  # Check that a few mandatory programs are installed
  missing_progs="no"
  for prog in patch perl tar wget cpio python unzip rsync bc ${DL_TOOLS} ; do
  	if ! which $prog > /dev/null ; then
  		echo "You must install '$prog' on your build machine";
  		missing_progs="yes"
  		if test $prog = "svn" ; then
  			echo "  svn is usually part of the subversion package in your distribution"
  		elif test $prog = "hg" ; then
  			echo "  hg is usually part of the mercurial package in your distribution"
  		elif test $prog = "zcat" ; then
  			echo "  zcat is usually part of the gzip package in your distribution"
  		elif test $prog = "bzcat" ; then
  			echo "  bzcat is usually part of the bzip2 package in your distribution"
  		fi
  	fi
  done
  
  if test "${missing_progs}" = "yes" ; then
  	exit 1
  fi
  
  if grep ^BR2_TOOLCHAIN_BUILDROOT=y $BR2_CONFIG > /dev/null && \
  	grep ^BR2_ENABLE_LOCALE=y       $BR2_CONFIG > /dev/null ; then
  	if ! which locale > /dev/null ; then
  		echo
  		echo "You need locale support on your build machine to build a toolchain supporting locales"
  		exit 1 ;
  	fi
  	if ! locale -a | grep -q -i utf8$ ; then
  		echo
  		echo "You need at least one UTF8 locale to build a toolchain supporting locales"
  		exit 1 ;
  	fi
  fi
  
  if grep -q ^BR2_NEEDS_HOST_JAVA=y $BR2_CONFIG ; then
  	check_prog_host "java"
  	JAVA_GCJ=$(java -version 2>&1 | grep gcj)
  	if [ ! -z "$JAVA_GCJ" ] ; then
  		echo
  		echo "$JAVA_GCJ is not sufficient to compile your package selection."
  		echo "Please install an OpenJDK/IcedTea/Oracle Java."
  		exit 1 ;
  	fi
  fi
  
  if grep -q ^BR2_NEEDS_HOST_JAVAC=y $BR2_CONFIG ; then
  	check_prog_host "javac"
  fi
  
  if grep -q ^BR2_NEEDS_HOST_JAR=y $BR2_CONFIG ; then
  	check_prog_host "jar"
  fi
  
  if grep -q ^BR2_HOSTARCH_NEEDS_IA32_LIBS=y $BR2_CONFIG ; then
  	if test ! -f /lib/ld-linux.so.2 ; then
  		echo
  		echo "Your Buildroot configuration uses pre-built tools for the x86 architecture,"
  		echo "but your build machine uses the x86-64 architecture without the 32 bits compatibility"
  		echo "library."
  		echo "If you're running a Debian/Ubuntu distribution, install the libc6-i386,"
  		echo "lib32stdc++6, and lib32z1 packages (or alternatively libc6:i386,"
  		echo "libstdc++6:i386, and zlib1g:i386)."
  		echo "For other distributions, refer to the documentation on how to install the 32 bits"
  		echo "compatibility libraries."
  		exit 1
  	fi
  fi
  
  if grep -q ^BR2_HOSTARCH_NEEDS_IA32_COMPILER=y $BR2_CONFIG ; then
  	if ! echo "int main(void) {}" | gcc -m32 -x c - -o /dev/null 2>/dev/null; then
  		echo
  		echo "Your Buildroot configuration needs a compiler capable of building 32 bits binaries."
  		echo "If you're running a Debian/Ubuntu distribution, install the gcc-multilib package."
  		echo "For other distributions, refer to their documentation."
  		exit 1
  	fi
  fi
  
  # Check that the Perl installation is complete enough for Buildroot.
  required_perl_modules="Data::Dumper" # Needed to build host-autoconf
  required_perl_modules="$required_perl_modules Thread::Queue" # Used by host-automake
  
  # This variable will keep the modules that are missing in your system.
  missing_perl_modules=""
  
  for pm in $required_perl_modules ; do
  	if ! perl  -e "require $pm" > /dev/null 2>&1 ; then
  		missing_perl_modules="$missing_perl_modules $pm"
  	fi
  done
  
  if [ -n "$missing_perl_modules" ] ; then
  	echo "Your Perl installation is not complete enough; at least the following"
  	echo "modules are missing:"
  	echo
  	for pm in $missing_perl_modules ; do
  		printf "\t $pm
  "
  	done
  	echo
  	exit 1
  fi