Overhaul Makefile and directory structure

[shadowclad.git] / Makefile

diff --git a/Makefile b/Makefile
index 6dcf1047887dcc357bfdca8493b480315eaa1b14..d4307a25433418814ccb1beef6cbc8b0162a0a61 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,56 +1,100 @@
+PLATFORM ?= x86_64-linux-gnu
+
+BUILDDIR ?= target/$(PLATFORM)
+SRCDIR ?= src
+
 CFLAGS ::= -g -std=c99 -Wall -Wextra -Wpedantic $(CFLAGS)
 LDFLAGS ::= $(LDFLAGS)
 LDLIBS ::= -L/usr/local/lib -lGL -lGLEW -lglut -lassimp $(LDLIBS)
 
-# Prefix all object file names with the compilation directory
-objects ::= $(addprefix out/, \
-              main.o asset.o level.o logger.o \
-              performance.o player.o render.o tga.o ui.o)
-
-# Set executable extension for the platform
-ifeq ($(OS),Windows_NT)
-       binext ::= .exe
-else
-       binext ::=
-endif
-binary ::= out/shadowclad$(binext)
-
-# Default target: build executable
-$(binary) : $(objects) | out
+# ######
+# Paths
+# ######
+
+vpath %.c $(SRCDIR)
+vpath %.h $(SRCDIR)
+
+sources ::= main.c \
+            asset.c \
+            level.c \
+            logger.c \
+            performance.c \
+            player.c \
+            render.c \
+            tga.c \
+            ui.c
+
+objects ::= $(addprefix $(BUILDDIR)/, $(addsuffix .o, $(sources)))
+depfiles ::= $(addprefix $(BUILDDIR)/, $(addsuffix .mk, $(sources)))
+
+# Set executable name for the platform
+# TODO Base this on target platform instead of host OS
+#ifeq ($(OS),Windows_NT)
+#      binext ::= .exe
+#else
+#      binext ::=
+#endif
+binary ::= $(BUILDDIR)/shadowclad #$(binext)
+
+# ######
+# Main build rules
+# ######
+
+# Default rule: build executable
+$(binary): $(objects) | $(BUILDDIR)
        @echo "###### Linking executable..."
-       $(CC) $(LDFLAGS) -o $(binary) $(objects) $(LOADLIBES) $(LDLIBS)
+       $(CC) $(LDFLAGS) -o $(binary) $^ $(LOADLIBES) $(LDLIBS)
 
-# Alias for default target
-shadowclad : $(binary)
-.PHONY : shadowclad
+# Build C translation units
+$(BUILDDIR)/%.c.o: %.c $(BUILDDIR)/%.c.mk | $(BUILDDIR)
+       $(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
+
+# ######
+# Setup
+# ######
+
+# Create build directory
+$(BUILDDIR):
+       mkdir -p $(BUILDDIR)
+
+# ######
+# Aliases
+# ######
 
 # Build and run
-run : $(binary)
+run: $(binary)
        @echo
        LD_LIBRARY_PATH=/usr/local/lib $(binary)
-.PHONY : run
+.PHONY: run
 
-# Create compilation directory
-out :
-       mkdir out/
+# Initialise build environment
+init: $(BUILDDIR)
+.PHONY: init
 
-# Alias for 'out'
-init : out
-.PHONY : init
+# Build executable
+shadowclad: $(binary)
+.PHONY: shadowclad
 
-# Generate dependencies
-out/%.make : %.c Makefile | out
-       $(CPP) -MM -MT out/$*.o -MF $@ $(CPPFLAGS) $<
+# ######
+# Prerequisites
+# ######
 
-# Include generated rules
--include $(addsuffix .make, $(basename $(objects)))
+# Generate C prerequisite makefiles
+$(BUILDDIR)/%.c.mk: %.c Makefile | $(BUILDDIR)
+       @echo "Generating prerequisites for $<"
+       @$(CPP) -MM -MT $(BUILDDIR)/$*.c.o -MF $@ $(CPPFLAGS) $<
+       @sed -E -i 's|^([^\s:]+)([ :])|\1 $@\2|' $@
 
-# Build compilation units
-out/%.o : %.c out/%.make | out
-       $(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $<
+# Include generated C prerequisites
+include $(foreach depfile, $(depfiles), $(shell [ -r "$(depfile)" ] && echo "$(depfile)"))
+
+# Do not automatically delete generated prerequisites
+.SECONDARY: $(depfiles)
+
+# ######
+# Cleanup rules
+# ######
 
-# Delete build output
-clean : out
-       rm -f $(binary) out/*.o out/*.make
-       rm -d out/
-.PHONY : clean
+clean:
+       rm -rf $(BUILDDIR)
+.PHONY: clean