Merge pull request #1 from xinyangli/make-improvement

Improve Makefile and build system in general

Makefile

@@ -1,4 +1,5 @@
 # Makefile for AbstractMachine Kernels and Libraries
+include scripts/helpers/rules.mk
 
 ### *Get a more readable version of this Makefile* by `make html` (requires python-markdown)
 html:
@@ -8,18 +9,15 @@ html:
 
 ## 1. Basic Setup and Checks
 
-### Default to create a bare-metal kernel image
+### Default to create all static libraries
 ifeq ($(MAKECMDGOALS),)
-  MAKECMDGOALS  = image
+  MAKECMDGOALS  = libs
-  .DEFAULT_GOAL = image
+  .DEFAULT_GOAL = libs
 endif
 
 ### Override checks when `make clean/clean-all/html`
 ifeq ($(findstring $(MAKECMDGOALS),clean|clean-all|html),)
 
-### Print build info message
-$(info # Building $(NAME)-$(MAKECMDGOALS) [$(ARCH)])
-
 ### Check: environment variable `$AM_HOME` looks sane
 ifeq ($(wildcard $(AM_HOME)/am/include/am.h),)
   $(error $$AM_HOME must be an AbstractMachine repo)
@@ -36,35 +34,20 @@ ARCH_SPLIT = $(subst -, ,$(ARCH))
 ISA        = $(word 1,$(ARCH_SPLIT))
 PLATFORM   = $(word 2,$(ARCH_SPLIT))
 
-### Check if there is something to build
-ifeq ($(flavor SRCS), undefined)
-  $(error Nothing to build)
-endif
-
 ### Checks end here
 endif
 
-## 2. General Compilation Targets
+## 2. Setup variables pointing to build and install directory
 
 ### Create the destination directory (`build/$ARCH`)
-WORK_DIR  = $(shell pwd)
+WORK_DIR  ?= $(shell pwd)
-DST_DIR   = $(WORK_DIR)/build/$(ARCH)
+DST_DIR   ?= $(WORK_DIR)/build/$(ARCH)
-$(shell mkdir -p $(DST_DIR))
+LIB_BUILDDIR ?= $(DST_DIR)/lib
+INSTALLDIR ?= $(WORK_DIR)/build/install/$(ARCH)
+LIB_INSTALLDIR ?= $(INSTALLDIR)/lib
+INC_INSTALLDIR ?= $(INSTALLDIR)/include
 
-### Compilation targets (a binary image or archive)
+## 3. Toolchain setup
-IMAGE_REL = build/$(NAME)-$(ARCH)
-IMAGE     = $(abspath $(IMAGE_REL))
-ARCHIVE   = $(WORK_DIR)/build/$(NAME)-$(ARCH).a
-
-### Collect the files to be linked: object files (`.o`) and libraries (`.a`)
-OBJS      = $(addprefix $(DST_DIR)/, $(addsuffix .o, $(basename $(SRCS))))
-LIBS     := $(sort $(LIBS) am klib) # lazy evaluation ("=") causes infinite recursions
-LINKAGE   = $(OBJS) \
-  $(addsuffix -$(ARCH).a, $(join \
-    $(addsuffix /build/, $(addprefix $(AM_HOME)/, $(LIBS))), \
-    $(LIBS) ))
-
-## 3. General Compilation Flags
 
 ### (Cross) compilers, e.g., mips-linux-gnu-g++
 CC        ?= $(CROSS_COMPILE)gcc
@@ -76,80 +59,103 @@ OBJDUMP   ?= $(CROSS_COMPILE)objdump
 OBJCOPY   ?= $(CROSS_COMPILE)objcopy
 READELF   ?= $(CROSS_COMPILE)readelf
 
-### Compilation flags
-INC_PATH += $(WORK_DIR)/include $(addsuffix /include/, $(addprefix $(AM_HOME)/, $(LIBS)))
-INCFLAGS += $(addprefix -I, $(INC_PATH))
-
-ARCH_H := arch/$(ARCH).h
-CFLAGS   += -lm -g -O3 -MMD -Wall $(INCFLAGS) \
-            -D__ISA__=\"$(ISA)\" -D__ISA_$(shell echo $(ISA) | tr a-z A-Z)__ \
-            -D__ARCH__=$(ARCH) -D__ARCH_$(shell echo $(ARCH) | tr a-z A-Z | tr - _) \
-            -D__PLATFORM__=$(PLATFORM) -D__PLATFORM_$(shell echo $(PLATFORM) | tr a-z A-Z | tr - _) \
-            -DARCH_H=\"$(ARCH_H)\" \
-            -fno-asynchronous-unwind-tables -fno-builtin -fno-stack-protector \
-            -Wno-main -U_FORTIFY_SOURCE -fvisibility=hidden
-CXXFLAGS +=  $(CFLAGS) -ffreestanding -fno-rtti -fno-exceptions
-ASFLAGS  += $(INCFLAGS)
-LDFLAGS  += -z noexecstack
-
 ## 4. Arch-Specific Configurations
 
-### Paste in arch-specific configurations (e.g., from `scripts/x86_64-qemu.mk`)
+# TODO: Removed CROSS_COMPILE toolchain setup as it's too complicated
--include $(AM_HOME)/scripts/$(ARCH).mk
+# 		  for Makefile to do right. Force the user to provide a CROSS_COMPILE
-
+# 		  prefix for now. They can also specify CFLAGS and LDFLAGS through
-### Fall back to native gcc/binutils if there is no cross compiler
+# 		  environment variable.
-ifeq ($(wildcard $(shell which $(CC))),)
+include $(AM_HOME)/scripts/$(ARCH).mk
-  $(info #  $(CC) not found; fall back to default gcc and binutils)
-  CROSS_COMPILE := riscv64-unknown-linux-gnu-
-endif
 
 ## 5. Compilation Rules
 
-### Rule (compile): a single `.c` -> `.o` (gcc)
+BUILDDIR := $(DST_DIR)
-$(DST_DIR)/%.o: %.c
+COMMON_CFLAGS := $(CFLAGS) -g -O3 -MMD -Wall \
-	@mkdir -p $(dir $@) && echo + CC $<
+                 -fno-asynchronous-unwind-tables -fno-builtin -fno-stack-protector \
-	@$(CC) -std=gnu11 $(CFLAGS) -c -o $@ $(realpath $<)
+                 -U_FORTIFY_SOURCE -fvisibility=hidden -fno-exceptions -std=gnu11 
+INTERFACE_LDFLAGS += -z noexecstack
+INTERFACE_CFLAGS += -fno-asynchronous-unwind-tables \
+                    -fno-builtin -fno-stack-protector \
+                    -U_FORTIFY_SOURCE -fvisibility=hidden -fno-exceptions
+### Build libam
+#### Include archetecture specific build flags
+COMMON_CFLAGS += -D__ARCH_$(shell echo $(ARCH) | tr a-z A-Z | tr - _) \
+                 -D__ISA_$(shell echo $(ISA) | tr a-z A-Z)__ \
+                 -DARCH_H=\"$(ARCH_H)\"
+INTERFACE_CFLAGS += -DARCH_H=\"$(ARCH_H)\"
 
-### Rule (compile): a single `.cc` -> `.o` (g++)
+#### Generating build rules with ADD_LIBRARY call. Target specific build flags can be tuned via changing prefixed variables (AM_ here)
-$(DST_DIR)/%.o: %.cc
+AM_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/am/src $(AM_HOME)/klib/include
-	@mkdir -p $(dir $@) && echo + CXX $<
+AM_CFLAGS += $(COMMON_CFLAGS) $(addprefix -I, $(AM_INCPATH))
-	@$(CXX) -std=c++17 $(CXXFLAGS) -c -o $@ $(realpath $<)
+AM_INTERFACE_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
+AM_INTERFACE_CFLAGS += 
+                       
+AM_INTERFACE_LDFLAGS += -lam-$(ARCH)
 
-### Rule (compile): a single `.cpp` -> `.o` (g++)
+$(eval $(call ADD_LIBRARY,$(LIB_BUILDDIR)/libam-$(ARCH).a,AM_))
-$(DST_DIR)/%.o: %.cpp
-	@mkdir -p $(dir $@) && echo + CXX $<
-	@$(CXX) -std=c++17 $(CXXFLAGS) -c -o $@ $(realpath $<)
 
-### Rule (compile): a single `.S` -> `.o` (gcc, which preprocesses and calls as)
+### Build klib
-$(DST_DIR)/%.o: %.S
-	@mkdir -p $(dir $@) && echo + AS $<
-	@$(AS) $(ASFLAGS) -c -o $@ $(realpath $<)
 
-### Rule (recursive make): build a dependent library (am, klib, ...)
+KLIB_SRCS := $(shell find klib/src/ -name "*.c")
-$(LIBS): %:
-	@$(MAKE) -s -C $(AM_HOME)/$* archive
 
-### Rule (link): objects (`*.o`) and libraries (`*.a`) -> `IMAGE.elf`, the final ELF binary to be packed into image (ld)
+KLIB_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
-$(IMAGE).elf: $(OBJS) $(LIBS)
+KLIB_CFLAGS += $(COMMON_CFLAGS) $(addprefix -I, $(KLIB_INCPATH))
-	@echo + LD "->" $(IMAGE_REL).elf
+KLIB_INTERFACE_INCPATH += $(AM_HOME)/am/include $(AM_HOME)/klib/include
-	@$(LD) $(LDFLAGS) -o $(IMAGE).elf --start-group $(LINKAGE) --end-group
+KLIB_INTERFACE_CFLAGS +=
+KLIB_INTERFACE_LDFLAGS += -lklib-$(ARCH)
 
-### Rule (archive): objects (`*.o`) -> `ARCHIVE.a` (ar)
+$(eval $(call ADD_LIBRARY,$(LIB_BUILDDIR)/libklib-$(ARCH).a,KLIB_))
-$(ARCHIVE): $(OBJS)
-	@echo + AR "->" $(shell realpath $@ --relative-to .)
-	@$(AR) rcs $(ARCHIVE) $(OBJS)
 
-### Rule (`#include` dependencies): paste in `.d` files generated by gcc on `-MMD`
+LIBS := am klib
--include $(addprefix $(DST_DIR)/, $(addsuffix .d, $(basename $(SRCS))))
+libs: $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, $(ALL)))
+$(LIBS): %: $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, %))
 
-## 6. Miscellaneous
+## 6. Install rules
+INTERFACE_INCPATH += $(sort $(KLIB_INTERFACE_INCPATH) $(AM_INTERFACE_INCPATH))
+# TODO: Use sort here will cause error on seperated flags, such as: -e _start
+# but without sort, duplicated flags will not be removed.
+INTERFACE_CFLAGS += $(addprefix -I, $(INTERFACE_INCPATH:%=$(INC_INSTALLDIR))) $(sort $(KLIB_INTERFACE_CFLAGS) $(AM_INTERFACE_CFLAGS))
+INTERFACE_CXXFLAGS += $(INTERFACE_CFLAGS) $(addprefix -I, $(INTERFACE_INCPATH:%=$(INC_INSTALLDIR)))
+INTERFACE_LDFLAGS += -L$(LIB_INSTALLDIR) $(sort $(KLIB_INTERFACE_LDFLAGS) $(AM_INTERFACE_LDFLAGS))
 
-### Build order control
+EXPORT_FLAGS_FILE := $(LIB_INSTALLDIR)/make/flags-$(ARCH).mk
-image: image-dep
+EXPORT_FLAGS_TEMPLATE := $(file < $(AM_HOME)/scripts/templates/flags.tmpl)
-archive: $(ARCHIVE)
+HELPERS := $(wildcard find scripts/helpers/*.mk)
-image-dep: $(OBJS) $(LIBS)
+EXPORT_HELPERS := $(HELPERS:scripts/helpers/%=$(LIB_INSTALLDIR)/make/%)
-	@echo \# Creating image [$(ARCH)]
+
-.PHONY: image image-dep archive run $(LIBS)
+EXPORTS := $(EXPORT_FLAGS_FILE) $(EXPORT_HELPERS)
+
+$(EXPORT_HELPERS): $(LIB_INSTALLDIR)/make/%: scripts/helpers/%
+	@echo + INSTALL $(patsubst $(INSTALLDIR)/%,%,$@)
+	@install -dm755 $(dir $@)
+	@install -Dm644 $< $(dir $@)
+
+export INTERFACE_CFLAGS INTERFACE_CXXFLAGS INTERFACE_ASFLAGS INTERFACE_INCPATH INTERFACE_LDFLAGS
+$(EXPORT_FLAGS_FILE):
+	@echo + INSTALL $(patsubst $(INSTALLDIR)/%,%,$@)
+	@install -Dm644 <(printf $(EXPORT_FLAGS_TEMPLATE)) $(EXPORT_FLAGS_FILE)
+
+LDSCRIPTS := $(patsubst $(AM_HOME)/scripts/%, $(LIB_INSTALLDIR)/ldscripts/%, $(shell find $(AM_HOME)/scripts -name "*.ld"))
+
+$(LDSCRIPTS): $(LIB_INSTALLDIR)/ldscripts/%: $(AM_HOME)/scripts/%
+	@echo + INSTALL $(patsubst $(INSTALLDIR)/%,%,$@)
+	@mkdir -p $(LIB_INSTALLDIR)/ldscripts
+	@install -Dm644 $< $(dir $@)
+
+install-libs: $(LIBS)
+	@echo + INSTALL LIBS: $(LIBS) 
+	@install -dm755 $(LIB_INSTALLDIR)
+	@install -Dm644 $(addsuffix -$(ARCH).a, $(addprefix $(LIB_BUILDDIR)/lib, $(LIBS))) $(LIB_INSTALLDIR)
+
+install-headers: HEADERS := $(shell find $(INTERFACE_INCPATH) -name '*.h')
+install-headers: $(HEADERS)	# Headers needs to be reinstalled if they are changed 
+	@echo + INSTALL HEADERS: $(INTERFACE_INCPATH)
+	@install -dm755 $(INC_INSTALLDIR)
+	@cp -r $(addsuffix /*, $(INTERFACE_INCPATH)) $(INC_INSTALLDIR)
+
+install: $(EXPORTS) install-libs install-headers $(LDSCRIPTS)
+
+.PHONY: libs $(LIBS) install
 
 ### Clean a single project (remove `build/`)
 clean:

am/src/platform/nemu/ioe/ioe.c

@@ -59,3 +59,4 @@ bool ioe_init() {
 
 void ioe_read(int reg, void *buf) { ((handler_t)lut[reg])(buf); }
 void ioe_write(int reg, void *buf) { ((handler_t)lut[reg])(buf); }
+

am/src/platform/nemu/trm.c

@@ -22,6 +22,7 @@ void halt(int code) {
   while (1);
 }
 
+
 void _trm_init() {
   heap_alloc_ptr = heap.start;
   int ret = main(mainargs);

am/src/riscv/nemu/start.S

@@ -5,4 +5,7 @@
 _start:
   mv s0, zero
   la sp, _stack_pointer
-  jal _trm_init
+
+  lui t0, %hi(_trm_init)   # Load upper 20 bits
+  addi t0, t0, %lo(_trm_init)  # Add lower 12 bits
+  jalr ra, t0, 0           # Jump and link register

klib/include/klib.h

@@ -24,6 +24,7 @@ char *strcpy(char *dst, const char *src);
 char *strncpy(char *dst, const char *src, size_t n);
 int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, size_t n);
+void *memchr(const void *src, int c, size_t n);
 
 
 //stdlib.h

klib/src/stdlib.c

@@ -54,4 +54,31 @@ void *malloc(size_t size) {
 void free(void *ptr) {
 }
 
+#include <stdint.h>
+#include <limits.h>
+
+#define SS (sizeof(size_t))
+#define ALIGN (sizeof(size_t)-1)
+#define ONES ((size_t)-1/UCHAR_MAX)
+#define HIGHS (ONES * (UCHAR_MAX/2+1))
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
+
+void *memchr(const void *src, int c, size_t n)
+{
+	const unsigned char *s = src;
+	c = (unsigned char)c;
+#ifdef __GNUC__
+	for (; ((uintptr_t)s & ALIGN) && n && *s != c; s++, n--);
+	if (n && *s != c) {
+		typedef size_t __attribute__((__may_alias__)) word;
+		const word *w;
+		size_t k = ONES * c;
+		for (w = (const void *)s; n>=SS && !HASZERO(*w^k); w++, n-=SS);
+		s = (const void *)w;
+	}
+#endif
+	for (; n && *s != c; s++, n--);
+	return n ? (void *)s : 0;
+}
+
 #endif

scripts/helpers/rules.mk

@@ -0,0 +1,64 @@
+
+# Usage:
+# $(1): Target prefix
+#
+# Generate build rules for files in variable <PREFIX>_SRCS. Use <PREFIX>_CFLAGS,
+# <PREFIX>_CXXFLAGS, <PREFIX>_ASFLAGS to control build flags.
+# Object files will be put into $BUILDDIR
+# E.g: 
+# $(eval $(call COMPILE_RULES,AM_))
+define COMPILE_RULES
+$(1)OBJS += $$(addprefix $$(BUILDDIR)/, $$(addsuffix .o, $$($(1)SRCS)))
+### Rule (compile): a single `.c` -> `.c.o` (gcc)
+$$(filter %.c.o, $$($(1)OBJS)): $$(BUILDDIR)/%.c.o: %.c
+	@mkdir -p $$(dir $$@) && echo + CC $$<
+	@$$(CC) $$($(1)CFLAGS) -c -o $$@ $$(realpath $$<)
+
+### Rule (compile): a single `.cc` -> `.cc.o` (g++)
+$$(filter %.cc.o, $$($(1)OBJS)): $$(BUILDDIR)/%.cc.o: %.cc
+	@mkdir -p $$(dir $$@) && echo + CXX $$<
+	@$$(CXX) $$($(1)CXXFLAGS) -c -o $$@ $$(realpath $$<)
+
+### Rule (compile): a single `.cpp` -> `.cpp.o` (g++)
+$$(filter %.cpp.o, $$($(1)OBJS)): $$(BUILDDIR)/%.cpp.o: %.cpp
+	@mkdir -p $$(dir $$@) && echo + CXX $$<
+	@$$(CXX) $$($(1)CXXFLAGS) -c -o $$@ $$(realpath $$<)
+
+### Rule (compile): a single `.S` -> `.S.o` (gcc, which preprocesses and calls as)
+$$(filter %.S.o, $$($(1)OBJS)): $$(BUILDDIR)/%.S.o: %.S
+	@mkdir -p $$(dir $$@) && echo + AS $$<
+	@$$(AS) $$($(1)ASFLAGS) -c -o $$@ $$(realpath $$<)
+
+### Rule (`#include` dependencies): paste in `.d` files generated by gcc on `-MMD`
+-include $$(addprefix $$(BUILDDIR)/, $$(addsuffix .d, $$(filter %.c %.cc, $$($(1)SRCS))))
+endef
+
+# Usage:
+# $(1): Library build path
+# $(2): Library variable prefix
+# E.g: 
+# $(eval $(call ADD_LIBRARY,am-riscv,AM_))
+define ADD_LIBRARY
+$(eval $(call COMPILE_RULES,$(2)))
+$(1): $$($(2)OBJS) 
+	@mkdir -p $$(dir $$@)
+	@echo + AR "->" $$(patsubst $$(CURDIR)/%,%,$(1))
+	@$$(AR) rcs $$@ $$($(2)OBJS)
+endef
+
+# Usage:
+# $(1): Image build path
+# $(2): Image variable prefix
+# E.g: 
+# $(eval $(call ADD_IMAGE,dummy,DUMMY_))
+define ADD_IMAGE
+$(eval $(call COMPILE_RULES,$(2)))
+$(1).elf: $$($(2)OBJS) 
+	@mkdir -p $$(dir $$@)
+	@echo + LD "->" $$(patsubst $$(CURDIR)/%,%,$(1).elf)
+	@$$(LD) -o $$@ $$(filter-out -l%,$$($(2)LDFLAGS)) --start-group $$($(2)OBJS) $$(filter -l%,$$($(2)LDFLAGS)) --end-group  
+$(1).bin: $(1).elf
+	@echo + OBJCOPY "->" $$(patsubst $$(CURDIR)/%,%,$(1).bin)
+	@$$(OBJCOPY) -S --set-section-flags .bss=alloc,contents -O binary $(1).elf $(1).bin
+endef
+

scripts/isa/riscv.mk

@@ -1,8 +1,9 @@
-CROSS_COMPILE := riscv64-linux-gnu-
+AM_CFLAGS        += -static -fno-pic -mstrict-align -ffreestanding
-COMMON_CFLAGS := -fno-pic -march=rv64g -mcmodel=medany  -mstrict-align
+AM_ASFLAGS       += -static -fno-pic -O0
-CFLAGS        += $(COMMON_CFLAGS) -static
+
-ASFLAGS       += $(COMMON_CFLAGS) -O0
+INTERFACE_CFLAGS += -static -mcmodel=medany -mstrict-align -ffreestanding
-LDFLAGS       += -melf64lriscv -O2
+INTERFACE_ASFLAGS += -static -mcmodel=medany
+INTERFACE_LDFLAGS += 
 
 # overwrite ARCH_H defined in $(AM_HOME)/Makefile
 ARCH_H := arch/riscv.h

scripts/platform/nemu.mk

@@ -1,27 +1,25 @@
-AM_SRCS := platform/nemu/trm.c \
+AM_SRCS := am/src/platform/nemu/trm.c \
-           platform/nemu/ioe/ioe.c \
+           am/src/platform/nemu/ioe/ioe.c \
-           platform/nemu/ioe/timer.c \
+           am/src/platform/nemu/ioe/timer.c \
-           platform/nemu/ioe/input.c \
+           am/src/platform/nemu/ioe/input.c \
-           platform/nemu/ioe/gpu.c \
+           am/src/platform/nemu/ioe/gpu.c \
-           platform/nemu/ioe/audio.c \
+           am/src/platform/nemu/ioe/audio.c \
-           platform/nemu/ioe/disk.c \
+           am/src/platform/nemu/ioe/disk.c \
-           platform/nemu/mpe.c
+           am/src/platform/nemu/mpe.c
 
-CFLAGS    += -fdata-sections -ffunction-sections
+AM_PUBLIC_CFLAGS := -fdata-sections -ffunction-sections
-LDFLAGS   += -T $(AM_HOME)/scripts/linker.ld \
+AM_PUBLIC_LDFLAGS := --defsym=_pmem_start=0x80000000 --defsym=_entry_offset=0x0 \
-             --defsym=_pmem_start=0x80000000 --defsym=_entry_offset=0x0
+                     --gc-sections --entry=_start
-LDFLAGS   += --gc-sections -e _start
+AM_CFLAGS += $(AM_PUBLIC_CFLAGS) -DMAINARGS=\"$(mainargs)\"
-NEMUFLAGS += -b 
+AM_LDFLAGS += -T$(AM_HOME)/scripts/linker.ld $(AM_PUBLIC_LDFLAGS)
-#-l $(shell dirname $(IMAGE).elf)/nemu-log.txt 
+AM_INCPATH += $(AM_HOME)/am/src/platform/nemu/include
 
-CFLAGS += -DMAINARGS=\"$(mainargs)\"
+AM_INTERFACE_CFLAGS += $(AM_PUBLIC_CFLAGS)
-CFLAGS += -I$(AM_HOME)/am/src/platform/nemu/include
+AM_INTERFACE_LDFLAGS += -T$(LIB_INSTALLDIR)/ldscripts/linker.ld $(AM_PUBLIC_LDFLAGS)
 .PHONY: $(AM_HOME)/am/src/platform/nemu/trm.c
 
-image: $(IMAGE).elf
+NEMUFLAGS += -b 
-	@$(OBJDUMP) -d $(IMAGE).elf > $(IMAGE).txt
+#-l $(shell dirname $(IMAGE).elf)/nemu-log.txt 
-	@echo + OBJCOPY "->" $(IMAGE_REL).bin
-	@$(OBJCOPY) -S --set-section-flags .bss=alloc,contents -O binary $(IMAGE).elf $(IMAGE).bin
 
 run: image
 	$(MAKE) -C $(NEMU_HOME) ISA=$(ISA) run ARGS="$(NEMUFLAGS)" IMG=$(IMAGE).bin

scripts/riscv32-nemu.mk

@@ -1,10 +1,14 @@
 include $(AM_HOME)/scripts/isa/riscv.mk
 include $(AM_HOME)/scripts/platform/nemu.mk
-CFLAGS  += -DISA_H=\"riscv/riscv.h\"
+AM_CFLAGS  += -DISA_H=\"riscv/riscv.h\" -march=rv32im_zicsr -mabi=ilp32
-COMMON_CFLAGS += -march=rv32im_zicsr -mabi=ilp32  # overwrite
+AM_ASFLAGS += -march=rv32im_zicsr -mabi=ilp32
-LDFLAGS       +=  -melf32lriscv                   # overwrite
+KLIB_CFLAGS += -march=rv32im_zicsr -mabi=ilp32
+AM_LDFLAGS += -melf32lriscv
+INTERFACE_CFLAGS += -march=rv32im_zicsr -mabi=ilp32
+INTERFACE_CXXFLAGS += -march=rv32im_zicsr -mabi=ilp32
+INTERFACE_ASFLAGS += -march=rv32im_zicsr -mabi=ilp32
 
-AM_SRCS += riscv/nemu/start.S \
+AM_SRCS += am/src/riscv/nemu/start.S \
-           riscv/nemu/cte.c \
+           am/src/riscv/nemu/cte.c \
-           riscv/nemu/trap.S \
+           am/src/riscv/nemu/trap.S \
-           riscv/nemu/vme.c
+           am/src/riscv/nemu/vme.c

scripts/templates/flags.tmpl

@@ -0,0 +1,10 @@
+"AM_CFLAGS += %s \n\
+AM_CXXFLAGS += %s \n\
+AM_INCPATH += %s \n\
+AM_LDFLAGS += %s \n\
+AM_ASFLAGS += %s" \
+"$INTERFACE_CFLAGS" \
+"$INTERFACE_CXXFLAGS" \
+"$INTERFACE_INCPATH" \
+"$INTERFACE_LDFLAGS" \
+"$INTERFACE_ASFLAGS"