Add the environment activation script

activate

@@ -0,0 +1,103 @@
+# Serene Programming Language
+#
+# Copyright (c) 2019-2022 Sameer Rahmani <lxsameer@gnu.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, version 2.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# -----------------------------------------------------------------------------
+# Commentary
+# -----------------------------------------------------------------------------
+# This file must be used with "source activate" *from bash* you cannot run it
+# directly.
+#
+# It will activate the development environment by making the dependencies
+# visible to the build system.
+#
+# Use the `deactiavate` function to go back to your normal shell
+if [ "${BASH_SOURCE-}" = "$0" ]; then
+    echo "You must source this script: \$ source $0" >&2
+    exit 33
+fi
+
+
+deactivate () {
+    # reset old environment variables
+    # ! [ -z ${VAR+_} ] returns true if VAR is declared at all
+    if ! [ -z "${_OLD_PATH:+_}" ] ; then
+        PATH="$_OLD_PATH"
+        export PATH
+        unset _OLD_PATH
+    fi
+
+    # The hash command must be called to get it to forget past
+    # commands. Without forgetting past commands the $PATH changes
+    # we made may not be respected
+    hash -r 2>/dev/null
+
+    if ! [ -z "${_OLD_PS1+_}" ] ; then
+        PS1="$_OLD_PS1"
+        export PS1
+        unset _OLD_PS1
+    fi
+
+    unset BUILD_DIR
+    unset TARGET_ARCHS
+    unset DEV_HEROES
+    unset BUILD_DIR_NAME
+    unset ME
+
+    unset LLVM_DIR_NAME
+    unset LLVM_DIR
+    unset LLVM_SOURCE_DIR
+    unset LLVM_BUILD_DIR
+    unset LLVM_INSTALL_DIR
+
+    unset BDWGC_DIR_NAME
+    unset BDWGC_DIR
+    unset BDWGC_BUILD_DIR
+    unset BDWGC_INSTALL_DIR
+    unset BDWgc_DIR
+    if [ ! "${1-}" = "nondestructive" ] ; then
+    # Self destruct!
+        unset -f deactivate
+    fi
+}
+
+# unset irrelevant variables
+deactivate nondestructive
+
+ME=$(cd "$(dirname "$0")/." >/dev/null 2>&1 ; pwd -P)
+source "$ME/config"
+
+info "Activating LLVM version '$(get_version $LLVM_DIR)'"
+info "Activating BDWGC version '$(get_version $BDWGC_SOURCE_DIR)'"
+
+_OLD_PATH="$PATH"
+
+PATH="$LLVM_INSTALL_DIR/bin:$PATH"
+export PATH
+
+if [ -z "${BUILD_DIR_DISABLE_PROMPT-}" ] ; then
+    _OLD_PS1="${PS1-}"
+    if [ "x" != x ] ; then
+        PS1="() ${PS1-}"
+    else
+        PS1="(World) ${PS1-}"
+    fi
+    export PS1
+fi
+
+# The hash command must be called to get it to forget past
+# commands. Without forgetting past commands the $PATH changes
+# we made may not be respected
+hash -r 2>/dev/null

scripts/deps.sh

@@ -34,8 +34,6 @@ function build_toolchain() { ## Build LLVM and the toolchain
 
     if [[ -d "$LLVM_BUILD_DIR.$version" ]]; then
         warn "A build dir for 'llvm' already exists at '$LLVM_BUILD_DIR.$version'"
-        warn "Skipping..."
-        return
     fi
 
     mkdir -p "$LLVM_BUILD_DIR.$version"