document git submodules, check for submodules, fail if bison or boost not present

README.md

@@ -12,6 +12,16 @@ wolfgang.thaller@gmx.net.
 Installing/Building
 -------------------
 
+The Retro68 git repository uses submodules; be sure to use the `--recursive` option to `git clone` or use
+
+    git submodule update --init
+
+after cloning. To get the latest changes, use
+
+    git pull
+    git submodule update
+
+
 ### Prerequisites
 
 - Linux, Mac OS X or Windows (via Cygwin)
@@ -20,12 +30,14 @@ Installing/Building
 - GCC dependencies: GMP 4.2+, MPFR 2.3.1+ and MPC 0.8.0+
 - bison version 3.0.2 or later
 - ruby version 2.1 or later
+- flex
+- texinfo
 - Recommended: Apple Universal Interfaces (version 3.x; version 3.4 is tested)
 - An ancient Mac and/or an emulator.
 
 For Ubuntu Linux, the following should help a bit:
 
-    sudo apt-get install cmake libgmp-dev libmpfr-dev libmpc-dev libboost-all-dev bison texinfo ruby
+    sudo apt-get install cmake libgmp-dev libmpfr-dev libmpc-dev libboost-all-dev bison flex texinfo ruby
 
 On a Mac, get the homebrew package manager and:
 

Rez/CMakeLists.txt

@@ -24,8 +24,13 @@ find_package(Boost COMPONENTS wave filesystem system thread regex program_option
 set(CMAKE_PROGRAM_PATH ${CMAKE_PROGRAM_PATH} "/usr/local/opt/bison/bin")
 find_package(BISON 3.0.2)
 
-if(Boost_FOUND AND BISON_FOUND)
+if(NOT Boost_FOUND)
+    message(FATAL_ERROR "The boost libraries have not been found.")
+endif()
 
+if(NOT BISON_FOUND)
+    message(FATAL_ERROR "GNU Bison version 3.0.2 or later is required.")
+endif()
 
 include_directories(. ${CMAKE_CURRENT_BINARY_DIR})
 
@@ -78,7 +83,3 @@ target_include_directories(Rez PRIVATE ${Boost_INCLUDE_DIR})
 install(TARGETS Rez RUNTIME DESTINATION bin)
 
 add_subdirectory(Test)
-
-else(Boost_FOUND AND BISON_FOUND)
-    message(WARNING "Rez compiler will not be built; both boost and Bison 3.0.2 are required")
-endif(Boost_FOUND AND BISON_FOUND)

build-toolchain.bash

@@ -24,6 +24,16 @@ DEFAULT_PREFIX=`pwd -P`/toolchain/
 PREFIX=$DEFAULT_PREFIX
 BINUTILS=`pwd -P`/binutils-build
 
+##################### Prerequisites check
+
+if [ ! -d "$SRC/multiversal" ]; then
+    echo "Could not find directory '$SRC/multiversal'."
+    echo "It looks like you did not clone the git submodules."
+    echo "Please run:"
+    echo "    git submodule update --init"
+    exit 1
+fi
+
 ##################### Command-line Options
 
 SKIP_THIRDPARTY=false