128 lines
3.2 KiB
Makefile
128 lines
3.2 KiB
Makefile
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all:
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.PHONY: help all clean
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ifneq ($(V),1)
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_@ :=@
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endif
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INC_DIRS ?=
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SRC_DIR ?= ./src
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OUT_DIR ?= ./out
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OS=$(shell uname)
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ifeq ($(OS),Darwin)
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LLVM_DIR ?= $(shell brew --prefix llvm)
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endif
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ifdef LLVM_DIR
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CC := $(LLVM_DIR)/bin/clang
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CXX := $(LLVM_DIR)/bin/clang++
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LLC := $(LLVM_DIR)/bin/llc
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OBJ_DUMP := $(LLVM_DIR)/bin/llvm-objdump
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else
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CC := clang-7
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CXX := clang++-7
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LLC := llc-7
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OBJ_DUMP := llvm-objdump-7
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endif
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SYSTEM_INC_DIRS := -isystem $(dir $(lastword $(MAKEFILE_LIST)))inc
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CC_FLAGS := \
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-Werror \
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-target bpf \
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-O2 \
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-emit-llvm \
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-fno-builtin \
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-std=c17 \
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CXX_FLAGS := \
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$(CC_FLAGS) \
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-std=c++17 \
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LLC_FLAGS := \
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-march=bpf \
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-filetype=obj \
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OBJ_DUMP_FLAGS := \
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-color \
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-source \
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-disassemble \
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help:
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@echo 'BPF Program makefile'
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@echo ''
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@echo 'This makefile will build BPF Programs from C or C++ source files into ELFs'
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@echo ''
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@echo 'Assumptions:'
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@echo ' - Programs are a single .c or .cc source file (may include headers)'
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@echo ' - Programs are located in the source directory: $(SRC_DIR)'
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@echo ' - Programs are named by their basename (eg. file name:foo.c/foo.cc -> program name:foo)'
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@echo ' - Output files will be placed in the directory: $(OUT_DIR)'
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@echo ''
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@echo 'User settings'
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@echo ' - The following setting are overridable on the command line, default values shown:'
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@echo ' - Show commands while building:'
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@echo ' V=1'
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@echo ' - List of include directories:'
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@echo ' INC_DIRS=$(INC_DIRS)'
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@echo ' - List of system include directories:'
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@echo ' SYSTEM_INC_DIRS=$(SYSTEM_INC_DIRS)'
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@echo ' - Location of source files:'
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@echo ' SRC_DIR=$(SRC_DIR)'
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@echo ' - Location to place output files:'
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@echo ' OUT_DIR=$(OUT_DIR)'
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@echo ' - Location of LLVM:'
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@echo ' LLVM_DIR=$(LLVM_DIR)'
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@echo ''
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@echo 'Usage:'
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@echo ' - make help - This help message'
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@echo ' - make all - Builds all the programs in the directory: $(SRC_DIR)'
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@echo ' - make clean - Cleans all programs'
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@echo ' - make dump_<program name> - Dumps the contents of the program to stdout'
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@echo ' - make <program name> - Build a single program by name'
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@echo ''
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@echo 'Available programs:'
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$(foreach name, $(PROGRAM_NAMES), @echo ' - $(name)'$(\n))
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@echo ''
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@echo 'Example:'
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@echo ' - Assuming a programed named foo (src/foo.c)'
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@echo ' - make foo'
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@echo ' - make dump_foo'
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.PRECIOUS: $(OUT_DIR)/%.bc
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$(OUT_DIR)/%.bc: $(SRC_DIR)/%.c
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@echo "[cc] $@ ($<)"
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$(_@)mkdir -p $(OUT_DIR)
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$(_@)$(CC) $(CC_FLAGS) $(SYSTEM_INC_DIRS) $(addprefix -I,$(INC_DIRS)) -o $@ -c $< -MD -MF $(@:.bc=.d)
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$(OUT_DIR)/%.bc: $(SRC_DIR)/%.cc
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@echo "[cc] $@ ($<)"
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$(_@)mkdir -p $(OUT_DIR)
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$(_@)$(CXX) $(CXX_FLAGS) $(SYSTEM_INC_DIRS) $(addprefix -I,$(INC_DIRS)) -o $@ -c $< -MD -MF $(@:.bc=.d)
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.PRECIOUS: $(OUT_DIR)/%.o
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$(OUT_DIR)/%.o: $(OUT_DIR)/%.bc
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@echo "[llc] $@ ($<)"
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$(_@)$(LLC) $(LLC_FLAGS) -o $@ $<
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-include $(wildcard $(OUT_DIR)/*.d)
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PROGRAM_NAMES := $(notdir $(basename $(wildcard $(SRC_DIR)/*.c $(SRC_DIR)/*.cc)))
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define \n
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endef
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all: $(PROGRAM_NAMES)
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%: $(addprefix $(OUT_DIR)/, %.o) ;
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dump_%: %
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$(_@)$(OBJ_DUMP) $(OBJ_DUMP_FLAGS) $(addprefix $(OUT_DIR)/, $(addsuffix .o, $<))
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clean:
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rm -rf $(OUT_DIR)
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