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Use an IELR parser if available

--- a/Makefile

+++ b/Makefile

@@ -133,6 +133,7 @@

 	add_flag 3 6 parse.error=detailed; \

 	add_flag 3 0 parse.error=verbose; \

 	add_flag 3 0 parse.lac=full; \

+	add_flag 3 0 lr.type=ielr; \

 	echo "DEFS=$$DEFS"; \

 	${BISON} $$DEFS -d ${YFLAGS} -o $@ $<

--- a/src/CMakeLists.txt

+++ b/src/CMakeLists.txt

@@ -33,6 +33,7 @@

 endif()

 if(BISON_VERSION VERSION_GREATER_EQUAL "3.0")

   set(BISON_FLAGS "${BISON_FLAGS} -Dparse.lac=full")

+  set(BISON_FLAGS "${BISON_FLAGS} -Dlr.type=ielr")

 endif()

 BISON_TARGET(PARSER "asm/parser.y"

              "${PROJECT_SOURCE_DIR}/src/asm/parser.c"