Selectively-compile open_memstream

Makefile

@@ -71,8 +71,10 @@ libcyclone.a: runtime.c include/cyclone/runtime.h include/cyclone/types.h gc.c d
 #	echo $(CC_EXEC)
 #	echo $(CC_LIB)
 	$(CC) $(CFLAGS) -c dispatch.c -o dispatch.o
-	$(CC) $(CFLAGS) -c mem-streams.c -o mem-streams.o
 	$(CC) $(CFLAGS) -std=gnu99 -c gc.c -o gc.o
+	$(CC) $(CFLAGS) -c \
+                  -DCYC_HAVE_OPEN_MEMSTREAM=$(CYC_PLATFORM_HAS_MEMSTREAM) \
+                  mem-streams.c -o mem-streams.o
 	$(CC) $(CFLAGS) -c \
                   -DCYC_INSTALL_DIR=\"$(PREFIX)\" \
                   -DCYC_INSTALL_LIB=\"$(LIBDIR)\" \

Makefile.config

@@ -4,15 +4,19 @@
 #
 # Configuration options for the makefile
 
+# Platform-specific flags, set to 0 if not supported
+CYC_PLATFORM_HAS_MEMSTREAM ?= 1
+
+# Compiler options
+CFLAGS       ?= -O2 -Wall -Iinclude -L.
+COMP_CFLAGS  ?= -O2 -Wall -I$(PREFIX)/include -L$(PREFIX)/lib
 # Use these lines instead for debugging or profiling
 #CFLAGS = -g -Wall
 #CFLAGS = -g -pg -Wall
-CFLAGS       ?= -O2 -Wall -Iinclude -L.
-COMP_CFLAGS  ?= -O2 -Wall -I$(PREFIX)/include -L$(PREFIX)/lib
 CC      ?= cc
 LIBS = -pthread -lcyclone -lck -lm
 
-# Commands "baked into" cycone for invoking the C compiler
+# Commands "baked into" cyclone for invoking the C compiler
 CC_PROG ?= "$(CC) ~src-file~ $(COMP_CFLAGS) -c -o ~exec-file~.o"
 CC_EXEC ?= "$(CC) ~exec-file~.o ~obj-files~ $(LIBS) $(COMP_CFLAGS) -o ~exec-file~"
 CC_LIB  ?= "$(CC) ~src-file~ $(COMP_CFLAGS) -c -o ~exec-file~.o"

mem-streams.c

@@ -37,7 +37,9 @@ port_type Cyc_io_open_output_string(void *data)
 {
   make_port(p, NULL, 0);
   errno = 0;
+#if CYC_HAVE_OPEN_MEMSTREAM
   p.fp = open_memstream(&(p.mem_buf), &(p.mem_buf_len));
+#endif
   if (p.fp == NULL){
     Cyc_rt_raise2(data, "Unable to open memory stream", obj_int2obj(errno));
   }