Changes to compile signing tools on darwin

The following works from a Mac with these changes:
make Q= ARCH=arm HAVE_MACOS=1 `pwd`/build/futility/futility

Only vbutil_keyblock and vbutil_kernel have been exercised.

BUG=none
TEST='make Q= ARCH=arm HAVE_MACOS=1 `pwd`/build/futility/futility'
BRANCH=none

Signed-off-by: David Riley <davidriley@chromium.org>

Change-Id: Ie69cfee0c650d4ff96be6322083a2fea1543ee39
Reviewed-on: https://chromium-review.googlesource.com/246773
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Commit-Queue: David Riley <davidriley@chromium.org>
diff --git a/Makefile b/Makefile
index 2488203..12a27c7 100644
--- a/Makefile
+++ b/Makefile
@@ -179,6 +179,10 @@
   COV_INFO = ${BUILD}/coverage.info
 endif
 
+ifdef HAVE_MACOS
+  CFLAGS += -DHAVE_MACOS -Wno-deprecated-declarations
+endif
+
 # And a few more default utilities
 LD = ${CC}
 CXX ?= g++
diff --git a/cgpt/cgpt.h b/cgpt/cgpt.h
index ff9e106..b8b7e8d 100644
--- a/cgpt/cgpt.h
+++ b/cgpt/cgpt.h
@@ -6,7 +6,9 @@
 #define VBOOT_REFERENCE_UTILITY_CGPT_CGPT_H_
 
 #include <fcntl.h>
+#ifndef HAVE_MACOS
 #include <features.h>
+#endif
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/cgpt/cgpt_common.c b/cgpt/cgpt_common.c
index ffaa309..5bb44f7 100644
--- a/cgpt/cgpt_common.c
+++ b/cgpt/cgpt_common.c
@@ -9,8 +9,10 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
+#ifndef HAVE_MACOS
 #include <linux/major.h>
 #include <mtd/mtd-user.h>
+#endif
 #include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -265,6 +267,7 @@
   if (fstat(fd, &stat) == -1) {
     return -1;
   }
+#ifndef HAVE_MACOS
   if ((stat.st_mode & S_IFMT) != S_IFREG) {
     if (ioctl(fd, BLKGETSIZE64, size) < 0) {
       return -1;
@@ -276,6 +279,10 @@
     *sector_bytes = 512;  /* bytes */
     *size = stat.st_size;
   }
+#else
+  *sector_bytes = 512;  /* bytes */
+  *size = stat.st_size;
+#endif
   return 0;
 }
 
@@ -289,7 +296,11 @@
   // Clear struct for proper error handling.
   memset(drive, 0, sizeof(struct drive));
 
-  drive->fd = open(drive_path, mode | O_LARGEFILE | O_NOFOLLOW);
+  drive->fd = open(drive_path, mode | 
+#ifndef HAVE_MACOS
+		               O_LARGEFILE |
+#endif
+			       O_NOFOLLOW);
   if (drive->fd == -1) {
     Error("Can't open %s: %s\n", drive_path, strerror(errno));
     return CGPT_FAILED;
@@ -1010,4 +1021,6 @@
 
 /* Optional */
 int __GenerateGuid(Guid *newguid) { return CGPT_FAILED; };
+#ifndef HAVE_MACOS
 int GenerateGuid(Guid *newguid) __attribute__((weak, alias("__GenerateGuid")));
+#endif
diff --git a/cgpt/cgpt_endian.h b/cgpt/cgpt_endian.h
index 04204e7..49439cc 100644
--- a/cgpt/cgpt_endian.h
+++ b/cgpt/cgpt_endian.h
@@ -7,11 +7,15 @@
 #define VBOOT_REFERENCE_UTILITY_CGPT_ENDIAN_H_
 
 // Newer distros already have this. For those that don't, we add it here.
+#ifndef HAVE_MACOS
 #include <endian.h>
+#endif
 
 #ifndef le16toh
 
+#ifndef HAVE_MACOS
 # include <byteswap.h>
+#endif
 
 # if __BYTE_ORDER == __LITTLE_ENDIAN
 #  define htobe16(x) __bswap_16 (x)
diff --git a/futility/cmd_vbutil_kernel.c b/futility/cmd_vbutil_kernel.c
index f1573b6..ae4fd3f 100644
--- a/futility/cmd_vbutil_kernel.c
+++ b/futility/cmd_vbutil_kernel.c
@@ -10,7 +10,9 @@
 #include <fcntl.h>
 #include <getopt.h>
 #include <inttypes.h>		/* For PRIu64 */
+#ifndef HAVE_MACOS
 #include <linux/fs.h>		/* For BLKGETSIZE64 */
+#endif
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
@@ -176,11 +178,13 @@
 		Fatal("Unable to stat %s: %s\n", filename, strerror(errno));
 
 	if (S_ISBLK(statbuf.st_mode)) {
+#ifndef HAVE_MACOS
 		int fd = open(filename, O_RDONLY);
 		if (fd >= 0) {
 			ioctl(fd, BLKGETSIZE64, &file_size);
 			close(fd);
 		}
+#endif
 	} else {
 		file_size = statbuf.st_size;
 	}
diff --git a/futility/file_type.c b/futility/file_type.c
index 7d56ca2..6696bb4 100644
--- a/futility/file_type.c
+++ b/futility/file_type.c
@@ -37,7 +37,7 @@
 
 const char * const futil_file_type_str(enum futil_file_type type)
 {
-	if (type < 0 || type >= NUM_FILE_TYPES)
+	if ((int) type < 0 || type >= NUM_FILE_TYPES)
 		type = FILE_TYPE_UNKNOWN;
 
 	return type_strings[type];
diff --git a/futility/misc.c b/futility/misc.c
index 24e645b..3d85f69 100644
--- a/futility/misc.c
+++ b/futility/misc.c
@@ -5,7 +5,9 @@
  */
 
 #include <errno.h>
+#ifndef HAVE_MACOS
 #include <linux/fs.h>		/* For BLKGETSIZE64 */
+#endif
 #include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -241,8 +243,10 @@
 		return FILE_ERR_STAT;
 	}
 
+#ifndef HAVE_MACOS
 	if (S_ISBLK(sb.st_mode))
 		ioctl(fd, BLKGETSIZE64, &sb.st_size);
+#endif
 
 	/* If the image is larger than 2^32 bytes, it's wrong. */
 	if (sb.st_size < 0 || sb.st_size > UINT32_MAX) {
diff --git a/futility/traversal.c b/futility/traversal.c
index 3c3b422..8421b25 100644
--- a/futility/traversal.c
+++ b/futility/traversal.c
@@ -164,7 +164,7 @@
 	      __func__, name, state->op, futil_cb_component_str[c],
 	      offset, len, buf);
 
-	if (c < 0 || c >= NUM_CB_COMPONENTS) {
+	if ((int) c < 0 || c >= NUM_CB_COMPONENTS) {
 		fprintf(stderr, "Invalid component %d\n", c);
 		return 1;
 	}
@@ -203,7 +203,7 @@
 	const struct bios_area_s *area;
 	int retval = 0;
 
-	if (state->op < 0 || state->op >= NUM_FUTIL_OPS) {
+	if ((int) state->op < 0 || state->op >= NUM_FUTIL_OPS) {
 		fprintf(stderr, "Invalid op %d\n", state->op);
 		return 1;
 	}
diff --git a/host/arch/arm/lib/crossystem_arch.c b/host/arch/arm/lib/crossystem_arch.c
index b032ed3..6cd4f2d 100644
--- a/host/arch/arm/lib/crossystem_arch.c
+++ b/host/arch/arm/lib/crossystem_arch.c
@@ -7,7 +7,9 @@
 #include <string.h>
 #include <stddef.h>
 #include <stdlib.h>
+#ifndef HAVE_MACOS
 #include <linux/fs.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/param.h>
@@ -456,6 +458,7 @@
               __FUNCTION__, nvctx_path);
       break;
     }
+#ifndef HAVE_MACOS
     /* Must flush buffer cache here to make sure it goes to disk */
     rv = ioctl(nvctx_fd, BLKFLSBUF, 0);
     if (rv < 0) {
@@ -463,6 +466,7 @@
               __FUNCTION__, nvctx_path);
       break;
     }
+#endif
     rv = 0;
   } while (0);