Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
include ../common.mk
lib_LIBRARIES = libstage3.a
libstage3_a_SOURCES = \
stage3.cc \
flow_control_analysis.cc \
fill_candidate_datatypes.cc \
narrow_candidate_datatypes.cc \
forced_narrow_candidate_datatypes.cc \
print_datatypes_error.cc \
datatype_functions.cc \
lvalue_check.cc \
array_range_check.cc \
constant_folding.cc \
declaration_check.cc \
enum_declaration_check.cc \
remove_forward_dependencies.cc