1 files changed, 94 insertions, 19 deletions
diff --git a/util/nvmutil/Makefile b/util/nvmutil/Makefile
index 025e87e1..9d8548b9 100644
--- a/util/nvmutil/Makefile
+++ b/util/nvmutil/Makefile
@@ -2,26 +2,92 @@
 # Copyright (c) 2022,2026 Leah Rowe <leah@libreboot.org>
 # Copyright (c) 2023 Riku Viitanen <riku.viitanen@protonmail.com>
 
-CC?=cc
-CSTD?=-std=c90
-WERROR?=-Werror
-CWARN?=-Wall -Wextra -pedantic
-COPT?=-Os
-CFLAGS?=$(CWARN) $(CSTD)
-LDFLAGS?=
-DESTDIR?=
-PREFIX?=/usr/local
-INSTALL?=install
-LDIR?=-I.
-
-OPTS=$(LDIR) $(COPT) $(WERROR) $(CFLAGS) $(LDFLAGS)
-
-PROG=nvmutil
+# Makefile for nvmutil, which is an application
+# that modifies Intel GbE NVM configurations.
+
+CC = cc
+HELLCC = clang
+
+CFLAGS =
+LDFLAGS =
+DESTDIR =
+PREFIX = /usr/local
+INSTALL = install
+
+.SUFFIXES: .c .o
+
+LDIR =
+
+PORTABLE = $(LDIR) $(CFLAGS)
+WARN = $(PORTABLE) -Wall -Wextra
+STRICT = $(WARN) -std=c90 -pedantic -Werror
+HELLFLAGS = $(STRICT) -Weverything
+
+PROG = nvmutil
+
+OBJS = \
+	obj/nvmutil.o \
+	obj/lib/state.o \
+	obj/lib/file.o \
+	obj/lib/string.o \
+	obj/lib/usage.o \
+	obj/lib/command.o \
+	obj/lib/num.o \
+	obj/lib/io.o \
+	obj/lib/checksum.o \
+	obj/lib/word.o
+
+# default mode
+CFLAGS_MODE = $(PORTABLE)
+CC_MODE = $(CC)
 
 all: $(PROG)
 
-$(PROG): nvmutil.c
-	$(CC) $(OPTS) nvmutil.c -o $(PROG)
+$(PROG): $(OBJS)
+	$(CC_MODE) $(OBJS) -o $(PROG) $(LDFLAGS)
+
+# ensure obj directory exists
+$(OBJS): obj
+
+obj:
+	mkdir obj || true
+	mkdir obj/lib || true
+
+# main program object
+
+obj/nvmutil.o: nvmutil.c
+	$(CC_MODE) $(CFLAGS_MODE) -c nvmutil.c -o obj/nvmutil.o
+
+# library/helper objects
+
+obj/lib/state.o: lib/state.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/state.c -o obj/lib/state.o
+
+obj/lib/file.o: lib/file.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/file.c -o obj/lib/file.o
+
+obj/lib/string.o: lib/string.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/string.c -o obj/lib/string.o
+
+obj/lib/usage.o: lib/usage.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/usage.c -o obj/lib/usage.o
+
+obj/lib/command.o: lib/command.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/command.c -o obj/lib/command.o
+
+obj/lib/num.o: lib/num.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/num.c -o obj/lib/num.o
+
+obj/lib/io.o: lib/io.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/io.c -o obj/lib/io.o
+
+obj/lib/checksum.o: lib/checksum.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/checksum.c -o obj/lib/checksum.o
+
+obj/lib/word.o: lib/word.c
+	$(CC_MODE) $(CFLAGS_MODE) -c lib/word.c -o obj/lib/word.o
+
+# install
 
 install: $(PROG)
 	$(INSTALL) -d $(DESTDIR)$(PREFIX)/bin
@@ -32,8 +98,17 @@ uninstall:
 	rm -f $(DESTDIR)$(PREFIX)/bin/$(PROG)
 
 clean:
-	rm -f $(PROG)
+	rm -f $(PROG) $(OBJS)
 
 distclean: clean
 
-.PHONY: all install uninstall clean distclean
+# mode targets (portable replacement for ifeq)
+
+warn:
+	$(MAKE) CFLAGS_MODE="$(WARN)"
+
+strict:
+	$(MAKE) CFLAGS_MODE="$(STRICT)"
+
+hell:
+	$(MAKE) CFLAGS_MODE="$(HELLFLAGS)" CC_MODE="$(HELLCC)"