build: add hand-rolled make scaffold (gmake/bmake/build.sh/build.bat)

Static-lib-only build (libfpk.a, no shared/dynamic target), plus a
tools/ build path for fpack/funpack linked against the just-built
static lib. Matches stk's C89 build style; no library source yet.

gmake.mk

@@ -0,0 +1,101 @@
+include config.mk
+
+ifeq ($(OS),Windows_NT)
+    SHELL := cmd.exe
+    STATIC_LIB := lib$(LIB_NAME).a
+    CFLAGS_PLAT :=
+    MKDIR = if not exist $(subst /,\,$(1)) mkdir $(subst /,\,$(1))
+    RMDIR = if exist $(subst /,\,$(1)) rd /s /q $(subst /,\,$(1))
+    TOOL_EXT := .exe
+else
+    STATIC_LIB := lib$(LIB_NAME).a
+    CFLAGS_PLAT :=
+    MKDIR = mkdir -p $(1)
+    RMDIR = rm -rf $(1)
+    TOOL_EXT :=
+endif
+
+RELEASE_LDFLAGS := -s
+CFLAGS_BASE := -Wall -Wpedantic -I$(INC_DIR) -std=c89 $(CFLAGS_PLAT)
+
+PREFIX ?= /usr
+LIBDIR ?= $(PREFIX)/lib
+INCDIR ?= $(PREFIX)/include
+
+TOOL_DEBUG_BINS   := $(TOOL_SRCS:tools/%.c=$(BIN_DIR)/debug/tools/%$(TOOL_EXT))
+TOOL_RELEASE_BINS := $(TOOL_SRCS:tools/%.c=$(BIN_DIR)/release/tools/%$(TOOL_EXT))
+
+.PHONY: all debug release tools clean test install uninstall
+
+all: debug tools
+
+debug: $(BIN_DIR)/debug/$(STATIC_LIB)
+release: $(BIN_DIR)/release/$(STATIC_LIB)
+
+tools: $(TOOL_DEBUG_BINS)
+
+$(BIN_DIR)/debug/$(STATIC_LIB): $(SRCS:src/%.c=obj/debug/%.o)
+	@$(call MKDIR,$(@D))
+	ar rcs $@ $^
+
+obj/debug/%.o: src/%.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -g -O0 -MMD -MP -c $< -o $@
+
+$(BIN_DIR)/release/$(STATIC_LIB): $(SRCS:src/%.c=obj/release/%.o)
+	@$(call MKDIR,$(@D))
+	ar rcs $@ $^
+
+obj/release/%.o: src/%.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -O2 -MMD -MP -c $< -o $@
+
+obj/debug/tools/%.o: tools/%.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -g -O0 -MMD -MP -c $< -o $@
+
+$(BIN_DIR)/debug/tools/%$(TOOL_EXT): obj/debug/tools/%.o $(BIN_DIR)/debug/$(STATIC_LIB)
+	@$(call MKDIR,$(@D))
+	$(CC) -o $@ $< -L$(BIN_DIR)/debug -l$(LIB_NAME)
+
+obj/release/tools/%.o: tools/%.c
+	@$(call MKDIR,$(@D))
+	$(CC) $(CFLAGS_BASE) -O2 -MMD -MP -c $< -o $@
+
+$(BIN_DIR)/release/tools/%$(TOOL_EXT): obj/release/tools/%.o $(BIN_DIR)/release/$(STATIC_LIB)
+	@$(call MKDIR,$(@D))
+	$(CC) $(RELEASE_LDFLAGS) -o $@ $< -L$(BIN_DIR)/release -l$(LIB_NAME)
+
+-include $(wildcard obj/debug/*.d)
+-include $(wildcard obj/debug/tools/*.d)
+-include $(wildcard obj/release/*.d)
+-include $(wildcard obj/release/tools/*.d)
+
+clean:
+	@$(call RMDIR,$(OBJ_DIR))
+	@$(call RMDIR,$(BIN_DIR))
+
+test: debug
+	@echo "=== Building and running fpk tests ==="
+	@$(MAKE) -C test -f gmake.mk
+
+ifneq ($(OS),Windows_NT)
+install:
+	@test -f $(BIN_DIR)/release/$(STATIC_LIB) || { echo "Run 'make -f gmake.mk release' before installing."; exit 1; }
+	install -d $(LIBDIR) $(INCDIR)/fpk
+	install -m 644 $(BIN_DIR)/release/$(STATIC_LIB) $(LIBDIR)/
+	install -m 644 $(INC_DIR)/fpk.h $(INCDIR)/fpk/
+	install -m 644 $(INC_DIR)/fpk_version.h $(INCDIR)/fpk/
+
+uninstall:
+	rm -f $(LIBDIR)/$(STATIC_LIB)
+	rm -rf $(INCDIR)/fpk
+else
+install:
+	@echo "make install is not supported on Windows."
+	@echo "Copy include/ directory contents to your_project/include/fpk/"
+	@echo "Copy bin/release/libfpk.a to your project's lib directory."
+
+uninstall:
+	@echo "make uninstall is not supported on Windows."
+endif