From 0cba74f29f040c819769a072f9258f0eba800af5 Mon Sep 17 00:00:00 2001
From: Andrew Clark <andrewclarkii@gmail.com>
Date: Fri, 10 Dec 2021 22:02:57 +0300
Subject: revamped Makefile. It should be more posix accurate, but I am not
 sure about ifeq/else/endif conditionals. They are probably GNU specific

---
 source/Makefile | 99 ++++++++++++++++++++++++++++-----------------------------
 1 file changed, 48 insertions(+), 51 deletions(-)

diff --git a/source/Makefile b/source/Makefile
index 7fa99f2..a96ca59 100644
--- a/source/Makefile
+++ b/source/Makefile
@@ -1,74 +1,71 @@
-RM       = rm -f
-CC       = gcc
-COMMIT_INFO = commit.h
+.POSIX:
+.SUFFIXES:
 
-CFLAGS   = -O2 -Wall -Wno-restrict -Wno-unknown-warning-option
-ifeq ($(OS),Windows_NT)
-  LDFLAGS += -largp
-else
-  UNAME_S := $(shell uname -s)
-	ifeq ($(UNAME_S),Darwin)
-	  LDFLAGS += -largp
-	endif
-endif
+CC		?= cc
+RM		?= rm -f
+INSTALL		?= install -p
+COMMIT		:=
+COMMIT_INFO	= commit.h
 
-OBJS     = main.o input.o assemble.o expr.o code.o command.o\
-         macro.o func.o proc.o symbol.o output.o crc.o\
-         nes.o
+EXTRA_CFLAGS	?= -O2 -Wall -Wno-restrict -Wno-unknown-warning-option
+CFLAGS		+= ${EXTRA_CFLAGS} -I.
+LDADD		?= -Wl,--as-needed	
 
-EXEDIR   = ..
+EXEDIR		?= ..
+PREFIX		?= /usr
+BINDIR		?= $(PREFIX)/bin
+
+PROGRAM		?= nesasm
 
-COMMIT = $(shell git rev-parse --short HEAD)
-COMMIT_DIRTY = $(shell git diff-index HEAD)
-ifneq ($(COMMIT_DIRTY),)
-  COMMIT += (dirty)
-endif
 ifeq ($(COMMIT),)
-  COMMIT = "unknown"
+  COMMIT = $(shell git rev-parse --short HEAD)
+else
+  COMMIT += $(shell git diff-index HEAD) (dirty)
 endif
 
 ifeq ($(OS),Windows_NT)
-  TARGNES  = $(EXEDIR)/nesasm.exe
+     LDFLAGS += -largp
+     $(PROGRAM) = $(EXEDIR)/$(PROGRAM).exe
 else
-  TARGNES  = $(EXEDIR)/nesasm
+     UNAME_S := $(shell uname -s)
+           ifeq ($(UNAME_S),Darwin)
+             LDFLAGS += -largp
+           endif
 endif
 
-#
-#
+# Object files
+
+OBJS     = main.o input.o assemble.o expr.o code.o command.o\
+         macro.o func.o proc.o symbol.o output.o crc.o\
+         nes.o
+
+# All *.c file compiled to *.o
+.SUFFIXES: .c .o
+.c.o:
+	$(CC) $(CFLAGS) -o $@ -c $<
 
-all: $(TARGNES)
-default: $(TARGNES)
+# default target
+all: commit_file $(PROGRAM)
 
-# CLEAN
-#
+commit_file: 
+	@printf "#define COMMIT \"$(COMMIT)\"\\n" > $(COMMIT_INFO)
 
 clean:
-	$(RM) *.o 
+
 ifeq ($(OS),Windows_NT)
-	@if [ -f "$(TARGNES)" ]; then for f in `cygcheck "$(TARGNES)" | grep .dll | grep msys` ; do rm -f $(EXEDIR)/`basename "$$f"` ; done fi
+	@if [ -f "$(PROGRAM)" ]; then for f in `cygcheck "$(PROGRAM)" | grep .dll | grep msys` ; do rm -f $(EXEDIR)/`basename "$$f"` ; done fi
 endif
-	$(RM) $(TARGNES)
-	$(RM) $(COMMIT_INFO)
 
-# ASSEMBLER
-#
+	$(RM) $(OBJS) $(PROGRAM) $(COMMIT_INFO)
 
-$(OBJS)  : defs.h externs.h protos.h
-main.o   : inst.h vars.h $(COMMIT_INFO)
-expr.o   : expr.h
-nes.o    : nes.h
-%.o : %.c
-	$(CC) $(CFLAGS) -o $@ -c $<
-
-.PHONY: $(COMMIT_INFO)
-$(COMMIT_INFO):
-	@printf "#define COMMIT \"$(COMMIT)\"\\n" > $(COMMIT_INFO)
+# Link objects into executable file
 
-# EXE
-#
+$(PROGRAM): $(OBJS)
+	$(CC) -o $(PROGRAM) $(OBJS) $(LDFLAGS) $(LDADD)
 
-$(TARGNES): $(OBJS)
-	$(CC) -o $(TARGNES) $(OBJS) $(LDFLAGS)
 ifeq ($(OS),Windows_NT)
-	@for f in `cygcheck "$(TARGNES)" | grep .dll | grep msys` ; do cp -vf `cygpath "$$f"` $(EXEDIR)/ ; done
+	@for f in `cygcheck "$(PROGRAM)" | grep .dll | grep msys` ; do cp -vf `cygpath "$$f"` $(EXEDIR)/ ; done
 endif
+
+.PHONY: all commit_file clean
+
-- 
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