Makefile templates

Variables

NAME := # Executable nameCC := # Program for compiling C programs; default ‘cc’
CFLAGS := # Extra flags to give to the C compilerCXX := # Program for compiling C++ programs
CXXFLAGS := # Extra flags to give to the C++ compilerCPPFLAGS := # Extra flags to give to the C preprocessor and programs that use it
DEPFLAGS = # Specific flags which convince the compiler to generate the dependency fileLDFLAGS := # Linker flags, path where to search for library: -L./libft
LDLIBS := # Library flags or names: -lm -lftVPATH := # A list of directories to be searched for source files: ./src/ ./src/parser
SRCS := # specify all source files (*.c)ODIR := # Dir for .o files (object files)
OBJS := # $(SRCS:%.c=$(ODIR)/%.o) get object files from src filesDDIR := # Dir for .d files (dependency files)
DEPS := # $(SRCS:%.c=$(DDIR)/%.d) get dep files from src files

Auto dependency generation

• https://make.mad-scientist.net/papers/advanced-auto-dependency-generation/
  (dependency flags explained at the bottom of the page)

Overview:

# Set the name of the target in the generated dependency file.
-MT $@
# Generate dependency information as a side-effect of compilation, not instead of compilation. This version omits system headers from the generated dependencies: if you prefer to preserve system headers as prerequisites, use -MD.
-MMD
# Adds a target for each prerequisite in the list, to avoid errors when deleting files.
-MP
# Write the generated dependency file $(DEPDIR)/$*.d.
-MF $(DEPDIR)/$*.d
# Generate list of dependency filesDEPS := $(SRCS:%.c=$(DEPDIR)/%.d)# Declare the generated dependency file as a prerequisite of the target, so that if it’s missing the target will be rebuilt. 
... $(DEPDIR)/%.d
# Declare the dependency directory as an order-only prerequisite of the target, so that it will be created when needed.
... | $(DEPDIR)
# Declare a rule for creating the dependency directory if it doesn’t exist:$(DEPDIR): ; @mkdir -p $@# Mention each dependency file as a target, so that make won’t fail if the file doesn’t exist.$(DEPFILES):
# Include the dependency files that exist-include$(DEPS)

Linux warn_unused_result fix

# **************************************************************************** ## SYSTEM SPECIFIC SETTINGS ## **************************************************************************** #ifeq ($(shell uname -s), Linux)
CFLAGS += -Wno-unused-result
endif

Parallel compilation with make -j

# It is recommended to use number of CPU cores for the num_of_processes
make -j<num_of_processes>

# Makefile builtin approachUNAME	:= $(shell uname -s)NUMPROC	:= 8
ifeq ($(UNAME), Linux)
NUMPROC := $(shell grep -c ^processor /proc/cpuinfo)
else ifeq ($(UNAME), Darwin)
NUMPROC := $(shell sysctl -n hw.ncpu)
endifall:
@$(MAKE)$(NAME) -j$(NUMPROC)