program.mk

   1 # Copyright 2018 apeos contributors
   2 #
   3 # apeos partial GNU makefile, build binary program from C sources
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  17
  18 # variables that have to be set before evaulating this program:
  19 #
  20 # BIN - name of the resulting binary program
  21 # SRCS - whitespace separated list of source filenames in /src/,
  22 #     without /src/ prefix.
  23
  24 TOP_DIR := $(shell pwd)
  25 #$(warning TOP_DIR=$(TOP_DIR))
  26 BUILD_DIR_BASE := $(TOP_DIR)/build
  27 #$(warning BUILD_DIR_BASE=$(BUILD_DIR_BASE))
  28 BUILD_PREFIX := $(BUILD_DIR_BASE)/$(BIN)-
  29 #$(warning BUILD_PREFIX=$(BUILD_PREFIX))
  30 SRC_DIR := $(TOP_DIR)/src
  31
  32 BIN_PATH := $(BUILD_DIR_BASE)/$(BIN)
  33
  34 # by default, create the resulting binary file
  35 .PHONY: default
  36 default: $(BIN_PATH)
  37         @file $(BIN_PATH)
  38
  39 #$(warning SRC_DIR=$(SRC_DIR))
  40 SRCS_PREFIXED := $(addprefix $(SRC_DIR)/,$(SRCS))
  41 #$(warning SRCS_PREFIXED="$(SRCS_PREFIXED)")
  42 OBJS := $(addprefix $(BUILD_PREFIX),$(patsubst %.c,%.o,$(SRCS)))
  43 #$(warning OBJS="$(OBJS)")
  44
  45 BUILT_FILES := $(OBJS) $(BIN)
  46
  47 $(BUILT_FILES): program.mk
  48
  49 CPPFLAGS := -I include
  50
  51 CFLAGS := -pipe
  52 LDFLAGS :=
  53
  54 ifeq ($(CFG),debug)
  55 CFLAGS += -O0
  56 CFLAGS += -g
  57 LDFLAGS += -g
  58 endif
  59 ifeq ($(CFG),size)
  60 CFLAGS := -Os
  61 endif
  62
  63 CFLAGS += -static
  64 LDFLAGS += -static
  65
  66 # gcc
  67 CC := $(GCC_PREFIX)gcc
  68 LD := $(GCC_PREFIX)gcc
  69
  70 ifneq ($(V),1)
  71 CC := @$(CC)
  72 LD := @$(LD)
  73 endif
  74
  75 $(BUILD_DIR_BASE):
  76         @mkdir -v $@
  77
  78 $(BUILT_FILES): $(BUILD_DIR_BASE)
  79
  80 $(BUILD_PREFIX)%.o: $(SRC_DIR)/%.c
  81         @echo [CC] $(shell basename $<)
  82         $(CC) -c $< $(CPPFLAGS) $(CFLAGS) -o $@
  83
  84 $(BIN_PATH): $(OBJS)
  85         @echo [LD] $(BIN)
  86         $(LD) $(OBJS) $(LDFLAGS) -o $@
  87
  88 .PHONY: clean
  89 clean:
  90         @rm -vf $(BUILT_FILES)