configure: add a proper configure script

It's not very good, but it supports all of the options by the
previous far-worse Makefile configure targets, and also now supports
out-of-tree builds.

Also include the relevent updates to the .buildbot script and
.gitignore.

Makefile

@@ -1,82 +1,50 @@
-build=OUT
-COV_DIR=$(OUT)/coverage/
-SRC_DIR=src
-APP_DIR=src/apps/
-OUT=build
+CONFIG = config.mak
 
+include $(CONFIG)
+
+CONFIGURE = $(SRC_DIR)/
+
+COV_DIR=$(OUT)/coverage/
+APP_DIR=$(SRC_DIR)/apps/
 CC=gcc
 
 CCFLAGS = -Wall -Werror
 CCFLAGS += -std=c99 -D_POSIX_C_SOURCE=200809L
 CCFLAGS += -I$(SRC_DIR)
 
-.PHONY: release debug
-
-CONFIG = $(OUT)/.config.mk
-
--include $(CONFIG)
-
-ifeq ($(DEBUG), 1)
-CCFLAGS += -DLOG_LEVEL=5 -DDEBUG
-CCFLAGS += -O0 -ggdb
-endif
-
-ifeq ($(COVERAGE), 1)
-LDFLAGS += -lgcov --coverage
-CCFLAGS += -O0 --coverage
-CCFLAGS += -fprofile-arcs -ftest-coverage
-endif
-
-ifeq ($(RELEASE), 1)
-CCFLAGS += -O3
-endif
-
 CCFLAGS += -I/usr/include/glib-2.0/ -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
 LDFLAGS += -lglib-2.0
 
+CCFLAGS += $(CCFLAGS_EXTRA)
+LDFLAGS += $(LDFLAGS_EXTRA)
+
 C_SOURCES = $(shell find $(SRC_DIR) -name "*.c")
 ALL_OBJS = $(patsubst $(SRC_DIR)/%.c, $(OUT)/%.o, $(C_SOURCES))
 APP_OBJS = $(filter $(OUT)/apps/%, $(ALL_OBJS))
 TEST_OBJS = $(filter $(OUT)%test.o, $(ALL_OBJS))
 OBJS = $(filter-out $(TEST_OBJS) $(APP_OBJS), $(ALL_OBJS))
 APPS = $(patsubst %.o, %, $(APP_OBJS))
+
 .PHONY: all
 all: gbdb gbasm tests
 
-.PHONY: config-debug config-release config-default config-coverage
-
-$(CONFIG):
-	@mkdir -p $(OUT)
-
-config-debug: $(CONFIG)
-	@echo "DEBUG=1" > $(CONFIG)
-
-config-release: $(CONFIG)
-	@echo "RELEASE=1" > $(CONFIG)
-
-config-coverage: $(CONFIG)
-	@echo "COVERAGE=1" > $(CONFIG)
-
-config-default: $(CONFIG)
-	@echo "" > $(CONFIG)
-
 .PHONY: gbdb gbasm
-
 gbdb: $(OUT)/apps/gbdb
 gbasm: $(OUT)/apps/gbasm
 
-.PHONY: gbasm-test sample-test tests
+.PHONY: gbasm-test tests
 
 TESTS = $(patsubst %.o, %, $(filter %/test.o, $(ALL_OBJS)))
 tests: $(TESTS)
 
 $(ALL_APPS) $(ALL_OBJS): $(CONFIG)
 
-$(OUT)/%.o: $(SRC_DIR)/%.c
+$(OUT)/%.o: $(SRC_DIR)/%.c $(CONFIG)
 	@echo "    CC   $@"
 	@$(shell mkdir -p $(@D))
 	@$(CC) -c $(CCFLAGS) -o $@ $<
 
+
 .SECONDEXPANSION:
 $(APPS) $(TESTS): $(OBJS) $$@.o
 	@echo "    LD   $@"
@@ -89,7 +57,7 @@ $(APPS) $(TESTS): $(OBJS) $$@.o
 define run_tests =
 	@for i in $(TESTS); do \
 		echo "    TEST $$i"; \
-		$$i; \
+		$$i | sed 's/^/         /'; \
 		if [ $$? -ne 0 ]; then \
 			exit 1; \
 		fi; \