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diff --git a/Makefile b/Makefile
index aba7775..9836831 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ ENABLE_READLINE := 1
ENABLE_VERIFIC := 0
ENABLE_COVER := 1
ENABLE_LIBYOSYS := 0
+ENABLE_GHDL := 0
# other configuration flags
ENABLE_GPROF := 0
@@ -49,7 +50,7 @@ all: top-all
YOSYS_SRC := $(dir $(firstword $(MAKEFILE_LIST)))
VPATH := $(YOSYS_SRC)
-CXXFLAGS += -Wall -Wextra -ggdb -I. -I"$(YOSYS_SRC)" -MD -D_YOSYS_ -fPIC -I$(PREFIX)/include
+CXXFLAGS += -Wall -Wextra -g -I. -I"$(YOSYS_SRC)" -MD -D_YOSYS_ -I$(PREFIX)/include
LDFLAGS += -L$(LIBDIR)
LDLIBS = -lstdc++ -lm
@@ -104,7 +105,7 @@ endif
ifeq ($(CONFIG),clang)
CXX = clang
LD = clang++
-CXXFLAGS += -std=c++11 -Os
+CXXFLAGS += -std=c++11 # -Os
ifneq ($(SANITIZER),)
$(info [Clang Sanitizer] $(SANITIZER))
@@ -236,6 +237,14 @@ CXXFLAGS += $(patsubst %,-I$(VERIFIC_DIR)/%,$(VERIFIC_COMPONENTS)) -DYOSYS_ENABL
LDLIBS += $(patsubst %,$(VERIFIC_DIR)/%/*-linux.a,$(VERIFIC_COMPONENTS))
endif
+ifeq ($(ENABLE_GHDL),1)
+GHDL_DIR ?= /usr/local/ghdl
+GHDL_INCLUDE_DIR ?= $(GHDL_DIR)/include
+GHDL_LIB_DIR ?= $(GHDL_DIR)/lib
+CXXFLAGS += -I$(GHDL_INCLUDE_DIR) -DYOSYS_ENABLE_GHDL
+LDLIBS += $(GHDL_LIB_DIR)/libghdlsynth.a $(shell cat $(GHDL_LIB_DIR)/ghdlsynth.link)
+endif
+
ifeq ($(ENABLE_COVER),1)
CXXFLAGS += -DYOSYS_ENABLE_COVER
endif
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