Compile compat/safebfuns.c with -O0

Only very recent versions of clang support `optnone`, so this is the
best we can do until we can assume everyone has updated. See #6

Makefile

@@ -1,3 +1,5 @@
+all: bcrypt.so
+
 include Makefile.mess
 
 SRCS += src/main.c
@@ -7,8 +9,6 @@ CFLAGS += -O2 -fPIC -DNDEBUG
 
 OBJS := $(patsubst %.c,%.o,$(SRCS))
 
-all: bcrypt.so
-
 debug: CFLAGS += -ggdb3 -UNDEBUG
 debug: all
 

Makefile.mess

@@ -42,3 +42,6 @@ endif
 ifeq ($(uname),FreeBSD)
 	SRCS += compat/getentropy/getentropy_freebsd.c
 endif
+
+compat/safebfuns.o: compat/safebfuns.c
+	$(CC) $(CFLAGS) -O0 -c -o $@ $^

compat/safebfuns.c

@@ -8,7 +8,7 @@
 	 * http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-December/040627.html
 	 */
 	#if __has_attribute( noinline ) && __has_attribute( optnone )
-		#define NOOPT __attribute__ (( optnone ))
+		#define NOOPT /* __attribute__ (( optnone )) */
 		#define NOINLINE __attribute__ (( noinline ))
 	#else
 		#error "require clang with noinline and optnone attributes"