Fix buildroot when launched from install script

bin/wally-tool-chain-install.sh

@@ -126,6 +126,8 @@ fi
 
 # Determine script directory to locate related scripts
 dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+WALLY=$(dirname "$dir")
+export WALLY
 
 # Get Linux distro and version
 source "${dir}"/wally-distro-check.sh

linux/Makefile

@@ -21,7 +21,7 @@ OBJDUMPS := $(foreach name, $(OBJDUMPS), $(DIS)/$(name).objdump)
 
 all: check_environment check_write_permissions clean download Image disassemble install dumptvs
 
-check_environment: $(RISCV)
+check_environment: $(RISCV) $(WALLY)
 ifeq ($(findstring :$(RISCV)/lib:,:$(LD_LIBRARY_PATH):),)
 	@(echo "ERROR: Your environment variables are not set correctly." >&2 \
 	&& echo "Make sure to source setup.sh or install buildroot using the wally-tool-chain-install.sh script." >&2 \
@@ -66,6 +66,9 @@ $(RISCV):
 	@ echo "ERROR: No $(RISCV) directory. Make sure you have installed the Wally Toolchain."
 	@ echo "and sourced setup.sh"
 
+$(WALLY):
+	@ echo "ERROR: $$WALLY is not set. Make sure you have sourced setup.sh"
+
 # Disassembly rules ---------------------------------------------------
 disassemble: check_environment
 	rm -rf $(BUILDROOT)/output/images/disassembly