Various fixes/updates

- Update HOWTO to note that directio and fallocate don't work with ZFS
  on Solaris.

Refactor the Makefile's to add CPPFLAGS and LIBS.
- Add -fno-omit-frame-pointer from Linux Makefile to every platform
- Change undefined $(ALL_CFLAGS) to $(CFLAGS)
- Pass -std=gnu99, without which OS X fails to build.
- Add -D__EXTENSIONS__ on Solaris since some functions we need are
  behind it.

- Pull in <limits.h> in fio.c to get PTHREAD_STACK_MIN.
- NetBSD doesn't define PTHREAD_STACK_MIN so set it to 4k in
   os-netbsd.h

- If we have posix_fallocate don't error out if it fails during mutex
  and malloc operations since it will fail on Solaris with a ZFS
  filesystem. As I understand it these aren't performance-critical
  operations so do they need to be considered critical?

- Remove fio_unused from os-* files since it's defined in fio.h and we
  don't really need it.

- FreeBSD has an idprio command but not the API so don't claim it does.

- OS X doesn't have the timer_* API so emulate it using
  setitimer/sigaction.

- NetBSD and Solaris don't support CLOCK_MONOTONIC in timer_create so
  remove FIO_HAVE_CLOCK_MONOTONIC from their os-* files.

I've noticed that a change I made a while ago to use fmin/fmax could
cause issues on older OSes - I had a CD with NetBSD 5.0.2 and found
they had only been implemented in 5.1 so I'm not sure if I should
revert it.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/Makefile b/Makefile
index 04cb60f..d3d6c43 100644
--- a/Makefile
+++ b/Makefile
@@ -1,43 +1,23 @@
 CC	= gcc
 DEBUGFLAGS = -D_FORTIFY_SOURCE=2 -DFIO_INC_DEBUG
-OPTFLAGS= -O2 -g $(EXTFLAGS)
-CFLAGS	= -Wwrite-strings -Wall -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 $(OPTFLAGS) $(DEBUGFLAGS) -fno-omit-frame-pointer -rdynamic
+CPPFLAGS= -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 \
+	$(DEBUGFLAGS)
+OPTFLAGS= -O2 -fno-omit-frame-pointer -g
+CFLAGS	= -std=gnu99 -Wwrite-strings -Wall $(OPTFLAGS) -rdynamic
+LIBS	= -lpthread -lm -ldl -lrt -laio
 PROGS	= fio
 SCRIPTS = fio_generate_plots
-OBJS = gettime.o fio.o ioengines.o init.o stat.o log.o time.o filesetup.o \
-	eta.o verify.o memory.o io_u.o parse.o mutex.o options.o \
-	rbtree.o diskutil.o fifo.o blktrace.o smalloc.o filehash.o helpers.o \
-	cgroup.o profile.o debug.o trim.o
-
-OBJS += lib/rand.o
-OBJS += lib/flist_sort.o
-OBJS += lib/num2str.o
-
-OBJS += crc/crc7.o
-OBJS += crc/crc16.o
-OBJS += crc/crc32.o
-OBJS += crc/crc32c.o
-OBJS += crc/crc32c-intel.o
-OBJS += crc/crc64.o
-OBJS += crc/sha1.o
-OBJS += crc/sha256.o
-OBJS += crc/sha512.o
-OBJS += crc/md5.o
-
-OBJS += engines/cpu.o
-OBJS += engines/libaio.o
-OBJS += engines/mmap.o
-OBJS += engines/posixaio.o
-OBJS += engines/sg.o
-OBJS += engines/splice.o
-OBJS += engines/sync.o
-OBJS += engines/null.o
-OBJS += engines/net.o
-OBJS += engines/syslet-rw.o
-OBJS += engines/guasi.o
-OBJS += engines/binject.o
-
-OBJS += profiles/tiobench.o
+	
+SOURCE = gettime.c fio.c ioengines.c init.c stat.c log.c time.c filesetup.c \
+	eta.c verify.c memory.c io_u.c parse.c mutex.c options.c rbtree.c \
+	diskutil.c fifo.c blktrace.c smalloc.c filehash.c helpers.c \
+	cgroup.c profile.c debug.c trim.c lib/rand.c lib/flist_sort.c \
+	lib/num2str.c $(wildcard crc/*.c) engines/cpu.c engines/libaio.c \
+	engines/mmap.c engines/posixaio.c engines/sg.c engines/splice.c \
+	engines/sync.c engines/null.c engines/net.c engines/syslet-rw.c \
+	engines/guasi.c engines/binject.c profiles/tiobench.c
+	
+OBJS = $(SOURCE:.c=.o)
 
 ifneq ($(findstring $(MAKEFLAGS),s),s)
 ifndef V
@@ -51,13 +31,14 @@
 bindir = $(prefix)/bin
 mandir = $(prefix)/man
 
-%.o: %.c
-	$(QUIET_CC)$(CC) -o $*.o -c $(CFLAGS) $<
+.c.o:
+	$(QUIET_CC)$(CC) -o $@ -c $(CFLAGS) $(CPPFLAGS) $<
+	
 fio: $(OBJS)
-	$(QUIET_CC)$(CC) $(CFLAGS) -o $@ $(filter %.o,$^) $(EXTLIBS) -lpthread -lm -ldl -laio -lrt
+	$(QUIET_CC)$(CC) $(CFLAGS) -o $@ $(LIBS) $(OBJS)
 
 depend:
-	$(QUIET_DEP)$(CC) -MM $(ALL_CFLAGS) *.c engines/*.c crc/*.c 1> .depend
+	$(QUIET_DEP)$(CC) -MM $(CFLAGS) $(CPPFLAGS) $(SOURCE) 1> .depend
 
 $(PROGS): depend