+
+ifndef Lib.mak.included
+Lib.mak.included := 1
+
+# These variables should be provided by the includer Makefile:
+# P should be the project name, mostly used to handle include directories
+# T should be the path to the top-level directory.
+# C should be the path to the current directory.
+
+# Load top-level directory local configuration
+sinclude $T/Config.mak
+
+# Verbosity flag (empty show nice messages, 1 be verbose)
+# honour make -s flag
+override V := $(if $(findstring s,$(MAKEFLAGS)),1,$V)
+
+# Flavor (variant), should be one of "dbg", "opt" or "cov"
+F ?= opt
+
+# Use C++ linker by default
+LINKER := $(CXX)
+
+# Use precompiled headers if non-empty
+GCH ?=
+
+
+# Directories
+##############
+
+# Use absolute paths to avoid problems with automatic dependencies when
+# building from subdirectories
+T := $(abspath $T)
+
+# Name of the current directory, relative to $T
+R := $(subst $T,,$(patsubst $T/%,%,$(CURDIR)))
+
+# Base directory where to put variants
+D ?= $T/build
+
+# Generated files top directory
+G ?= $D/$F
+
+# Objects (and other garbage like precompiled headers and dependency files)
+# directory
+O ?= $G/obj
+
+# Binaries directory
+B ?= $G/bin
+
+# Libraries directory
+L ?= $G/lib
+
+# Includes directory
+I ?= $G/include
+
+# Generated includes directory
+J ?= $G/geninc
+
+
+# Functions
+############
+
+# Find sources files and get the corresponding object names
+# The first argument should be the sources extension ("c" or "cpp" typically)
+# It expects the variable $T and $O to be defined as commented previously in
+# this file. $C should be defined to the path to the current directory relative
+# to the top-level.
+find_objects = $(patsubst $T/%.$1,$O/%.o,$(shell find $T/$C -name '*.$1'))
+
+# Abbreviate a file name. Cut the leading part of a file if it match to the $T
+# directory, so it can be displayed as if it were a relative directory. Take
+# just one argument, the file name.
+abbr = $(addprefix $(shell echo $R | sed 's|/\?\([^/]\+\)/\?|../|g'),\
+ $(subst $T,.,$(patsubst $T/%,%,$1)))
+
+# Execute a command printing a nice message if $V is empty
+# The first argument is mandatory and it's the command to execute. The second
+# and third arguments are optional and are the target name and command name to
+# pretty print.
+vexec = $(if $V,,\
+ echo ' $(notdir $(if $3,$(strip $3),$(firstword $1))) \
+ $(call abbr,$(if $2,$(strip $2),$@))' ; )$1
+
+# Same as vexec but it silence the echo command (prepending a @).
+exec = $(if $V,,@)$(call vexec,$1,$2,$3)
+
+# Compile a source file to an object, generating pre-compiled headers and
+# dependencies. The pre-compiled headers are generated only if the system
+# includes change. This function is designed to be used as a command in a rule.
+# It takes one argument only, the type of file to compile (typically "c" or
+# "cpp"). What to compile and the output files are built using the automatic
+# variables from a rule.
+define compile
+$(if $(GCH),\
+@if test -f $O/$*.d; then \
+ tmp=`mktemp`; \
+ h=`awk -F: '!$$0 {f = 1} $$0 && f {print $$1}' $O/$*.d`; \
+ grep -h '^#include <' $(call abbr,$<) $$h | sort -u > "$$tmp"; \
+ if diff -q -w "$(call abbr,$O/$*.$1.h)" "$$tmp" > /dev/null 2>&1; \
+ then \
+ rm "$$tmp"; \
+ else \
+ mv "$$tmp" "$(call abbr,$O/$*.$1.h)"; \
+ $(call vexec,$(COMPILE.$1) -o "$O/$*.$1.h.gch" "$O/$*.$1.h",\
+ $O/$*.$1.h.gch); \
+ fi \
+else \
+ touch "$(call abbr,$O/$*.$1.h)"; \
+fi \
+)
+$(call exec,$(COMPILE.$1) -o $@ -MMD -MP $(if $(GCH),-include $O/$*.$1.h) $<)
+endef
+
+# Link object files to build an executable. The objects files are taken from
+# the prerequisite files ($O/%.o). If in the prerequisite files are shared
+# objects ($L/lib%.so), they are included as libraries to link to (-l%). This
+# function is designed to be used as a command in a rule. The ouput name is
+# taken from the rule automatic variables. If an argument is provided, it's
+# included in the link command line. The variable LINKER is used to link the
+# executable; for example, if you want to link a C++ executable, you should use
+# LINKER := $(CXX).
+link = $(call exec,$(LINKER) $(LDFLAGS) $(TARGET_ARCH) -o $@ $1 \
+ $(patsubst $L/lib%.so,-l%,$(filter %.so,$^)) \
+ $(foreach obj,$(filter %.o,$^),$(obj)))
+
+
+# Overrided flags
+##################
+
+# Warn about everything
+override CPPFLAGS += -Wall
+
+# Use the includes directories to search for includes
+override CPPFLAGS += -I$I -I$J
+
+# Be standard compilant
+override CFLAGS += -std=c99 -pedantic
+override CXXFLAGS += -std=c++98 -pedantic
+
+# Use the generated library directory to for libraries
+override LDFLAGS += -L$L -Wall
+
+# Make sure the generated libraries can be found
+export LD_LIBRARY_PATH := $L:$(LD_LIBRARY_PATH)
+
+
+# Variant flags
+################
+
+ifeq ($F,dbg)
+override CPPFLAGS += -ggdb -DDEBUG
+endif
+
+ifeq ($F,opt)
+override CPPFLAGS += -O2 -DNDEBUG
+endif
+
+ifeq ($F,cov)
+override CPPFLAGS += -ggdb -pg --coverage
+override LDFLAGS += -pg --coverage
+endif
+
+
+# Automatic rebuilding when flags or commands changes
+######################################################
+
+# Re-compile C files if one of this variables changes
+COMPILE.c.FLAGS := $(CC) ~ $(CPPFLAGS) ~ $(CFLAGS) ~ $(TARGET_ARCH)
+
+# Re-compile C++ files if one of this variables changes
+COMPILE.cpp.FLAGS := $(CXX) ~ $(CPPFLAGS) ~ $(CXXFLAGS) ~ $(TARGET_ARCH)
+
+# Re-link binaries and libraries if one of this variables changes
+LINK.o.FLAGS := $(LD) ~ $(LDFLAGS) ~ $(TARGET_ARCH)
+
+
+# Default rules
+################
+
+$O/%.o: $T/%.c $G/compile-c-flags
+ $(call compile,c)
+
+$O/%.o: $T/%.cpp $G/compile-cpp-flags
+ $(call compile,cpp)
+
+$B/%: $G/link-o-flags
+ $(call link)
+
+$L/%.so: override CFLAGS += -fPIC
+$L/%.so: override CXXFLAGS += -fPIC
+$L/%.so: $G/link-o-flags
+ $(call link,-shared)
+
+.PHONY: clean
+clean:
+ $(call exec,$(RM) -r $D,$D)
+
+
+# Automatic dependency handling
+################################
+
+sinclude $(shell test -d $O && find $O -name '*.d')
+
+
+# Create build directory structure
+###################################
+
+# Create a file with flags used to trigger rebuilding when they change. The
+# first argument is the name of the file where to store the flags, the second
+# are the flags and the third argument is a text to be displayed if the flags
+# have changed. This should be used as a rule action or something where
+# a shell script is expected.
+gen_rebuild_flags = if test x"$2" != x"`cat $1 2>/dev/null`"; then \
+ test -f $1 && echo "$3"; \
+ echo "$2" > $1 ; fi
+
+# Create $O, $B, $L, $I and $J directories and replicate the directory
+# structure of the project into $O. Create one symlink "last" to the current
+# build directory and another to use as include directory. It update the flags
+# files to detect flag and/or compiler changes to force a rebuild.
+#
+# NOTE: the second mkdir can yield no arguments if the project don't have any
+# subdirectories, that's why the current directory "." is included, so it
+# won't show an error message in case of no subdirectories.
+setup_build_dir__ := $(shell \
+ mkdir -p $O $B $L $I $J; \
+ mkdir -p . $(addprefix $O,$(patsubst $T%,%,\
+ $(shell find $T -type d -not -path '$D*'))); \
+ $(call gen_rebuild_flags,$G/compile-c-flags, \
+ $(COMPILE.c.FLAGS),C compiler or flags;); \
+ $(call gen_rebuild_flags,$G/compile-cpp-flags, \
+ $(COMPILE.cpp.FLAGS),C++ compiler or flags;); \
+ $(call gen_rebuild_flags,$G/link-o-flags, \
+ $(LINK.o.FLAGS),linker or link flags;); \
+ test -L $I/$P || ln -s $T $I/$P; \
+ test -L $D/last || ln -s $F $D/last )
+
+# Print any generated message (if verbose)
+$(if $V,,$(if $(setup_build_dir__), \
+ $(info !! Something changed: $(setup_build_dir__) \
+ re-building affected files...)))
+
+endif
projects / software / makeit.git / commitdiff