Makefile for multiple CGI scripts

Makefile

@@ -1,14 +1,16 @@
-CGI_EXEC ?= main.cgi
-
 BD ?= build
 SD ?= src
 LIBS_DIR ?= libs
 LIBS ?= $(wildcard $(LIBS_DIR)/*)
 
+CGI_EXECS ?= view_comments.cgi
+EXEC_TARGETS := $(patsubst %.cgi,$(BD)/%.cgi,$(CGI_EXECS))
+
 LDFLAGS ?= -L$(BD)/ -lcgic -lqments -lhiredis -ltomcrypt -luuid
 
 SRC_FILES := $(shell find $(SD) -name *.c)
-OBJ_FILES := $(patsubst $(SD)/%.c,$(BD)/%.o,$(SRC_FILES))
+EXEC_OBJS := $(patsubst %.cgi,$(BD)/%.o,$(CGI_EXECS))
+OBJ_FILES := $(filter-out $(EXEC_OBJS),$(patsubst $(SD)/%.c,$(BD)/%.o,$(SRC_FILES)))
 
 INCLUDE_DIRS = -Ilibs/qments/include -Ilibs/cgic
 LIB_TARGETS = $(patsubst $(LIBS_DIR)/%,$(BD)/lib%.a,$(LIBS))
@@ -24,14 +26,14 @@ $(BD)/libqments.a:
 	$(MAKE) -C $(LIBS_DIR)/qments static
 	cp $(LIBS_DIR)/qments/$(BD)/libqments.a $(BD)
 
-$(BD)/$(CGI_EXEC): $(OBJ_FILES)
+$(BD)/%.cgi: $(BD)/%.o $(OBJ_FILES)
 	$(CC) $(INCLUDE_DIRS) $(CFLAGS) $^ -o $@ $(LDFLAGS)
 
 $(BD)/%.o: $(SD)/%.c $(LIB_TARGETS)
 	mkdir -p $(@D)
 	$(CC) $(INCLUDE_DIRS) $(CFLAGS) -c $< -o $@ $(LDFLAGS)
 
-all: $(BD)/$(CGI_EXEC)
+all: $(BD)/$(CGI_EXECS)
 
 clean:
 	rm -rfI $(BD)/

src/auth.h

@@ -7,6 +7,7 @@
 int user_by_session_id(const char *session_id, char *username);
 
 /* return 0 on failure, 1 on success, negative number on error */
+/* authenticate must assign a session id */
 int authenticate(const char *username, const char *password, char *sid);
 
 #endif /* AUTH_H */