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Makefile 3.1 KiB

4 years ago
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  1. #
  2. # Makefile
  3. #
  4. # Copyright (C) 2020 Christos Choutouridis <cchoutou@ece.auth.gr>
  5. #
  6. # This program is free software: you can redistribute it and/or modify
  7. # it under the terms of the GNU Lesser General Public License as
  8. # published by the Free Software Foundation, either version 3
  9. # of the License, or (at your option) any later version.
  10. #
  11. # This program is distributed in the hope that it will be useful,
  12. # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. # GNU Lesser General Public License for more details.
  15. #
  16. # You should have received a copy of the GNU Lesser General Public License
  17. # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18. #
  19. # ========== Project settings ==========
  20. TARGET := matmul
  21. SRC_DIR := src
  22. INC_DIR :=
  23. EXC_FILE :=
  24. # build directories
  25. BUILD_DIR := bin
  26. OBJ_DIR := $(BUILD_DIR)/obj
  27. DEP_DIR := $(BUILD_DIR)/.dep
  28. # ========== Compiler settings ==========
  29. CXX := gcc
  30. CPP := gcc -E
  31. CSIZE := size
  32. CFLAGS := -std=gnu99 -Wall -Wextra
  33. DEB_FLAGS := -DDEBUG -g3
  34. REL_FLAGS := -O3
  35. LDFLAGS := -lm
  36. PRE_DEFS :=
  37. #
  38. # =========== Main body and Patterns ===========
  39. #
  40. INC := $(foreach dir,$(INC_DIR),-I$(dir))
  41. DEF := $(foreach def,$(PRE_DEFS),-D$(def))
  42. # source files
  43. # recursive search into current and source directories
  44. SRC := $(wildcard *.c)
  45. SRC += $(foreach dir,$(SRC_DIR),$(wildcard $(dir)/*.c))
  46. SRC += $(foreach dir,$(SRC_DIR),$(wildcard $(dir)/**/*.c))
  47. # exclude every file from the exclude file list
  48. SRC := $(filter-out $(wildcard $(EXC_FILE)),$(SRC))
  49. OBJ := $(foreach file,$(SRC:%.c=%.o),$(OBJ_DIR)/$(file))
  50. DEP := $(foreach file,$(SRC:%.c=%.d),$(DEP_DIR)/$(file))
  51. # Make Dependencies pattern.
  52. # This little trick enables recompilation only when dependencies change
  53. # and it does so for changes both in source AND header files ;)
  54. #
  55. # It is based on Tom Tromey's method.
  56. #
  57. # Invoke cpp to create makefile rules with dependencies for each source file
  58. $(DEP_DIR)/%.d: %.c
  59. @mkdir -p $(@D)
  60. @$(CPP) $(CFLAGS) $(INC) $(DEF) -MM -MT $(OBJ_DIR)/$(<:.c=.o) -MF $@ $<
  61. # objects depent on .c AND dependency files, which have an empty recipe
  62. $(OBJ_DIR)/%.o: %.c $(DEP_DIR)/%.d
  63. @mkdir -p $(@D)
  64. $(CXX) -c $(CFLAGS) $(INC) $(DEF) -o $@ $<
  65. # empty recipe for dependency files. This prevents make errors
  66. $(DEP):
  67. # now include all dependencies
  68. # After all they are makefile dependency rules ;)
  69. include $(wildcard $(DEP))
  70. # main target rule
  71. $(BUILD_DIR)/$(TARGET): $(OBJ)
  72. @mkdir -p $(@D)
  73. @echo Linking to target: $(TARGET)
  74. #@echo $(CXX) $(LDFLAGS) -o $(@D)/$(TARGET) '$$(OBJ)'
  75. $(CXX) -o $(@D)/$(TARGET) $(OBJ) $(LDFLAGS)
  76. @echo
  77. @echo Print size information
  78. @$(CSIZE) $(@D)/$(TARGET)
  79. @echo Done
  80. .PHONY: clean
  81. clean:
  82. @echo Cleaning build directories
  83. @rm -rf $(OBJ_DIR)
  84. @rm -rf $(DEP_DIR)
  85. @rm -rf $(BUILD_DIR)
  86. #
  87. # ============ User Rules =============
  88. #
  89. .PHONY: debug
  90. debug: CFLAGS += $(DEB_FLAGS)
  91. debug: $(BUILD_DIR)/$(TARGET)
  92. .PHONY: release
  93. release: CFLAGS += $(REL_FLAGS)
  94. release: $(BUILD_DIR)/$(TARGET)
  95. .PHONY: all
  96. all: clean release