Make system: Build the drivers/ directory even if file descriptors are disabled. There are still things that may be needed from the drivers/ director (such as SYSLOG logic or lower half drivers).

ChangeLog

@@ -12105,3 +12105,7 @@
 	* SYSLOG: Remove lowsyslog(), vlowsyslog(), and associated macros
 	  *llinfo(), *llwarn(), and llerr().  In the redesigned syslog() logic,
 	  these serve no purpose (2016-06-20).
+	* Make system: Need to build the drivers/ directory even it file
+	  descriptors are not supported.  There are things in the drivers/
+	  directory that are still needed (like SYSLOG logic).
+

Directories.mk

@@ -59,7 +59,10 @@ endif
 #
 # FSDIRS depend on file descriptor support; NONFSDIRS do not (except for parts
 #   of FSDIRS).  We will exclude FSDIRS from the build if file descriptor
-#   support is disabled
+#   support is disabled.  NOTE that drivers, in general, depends on file
+#   descriptor support but is always built because there are other components
+#   in the drivers directory that are needed even if file descriptors are not
+#   supported.
 # CONTEXTDIRS include directories that have special, one-time pre-build
 #   requirements.  Normally this includes things like auto-generation of
 #   configuration specific files or creation of configurable symbolic links
@@ -69,8 +72,8 @@ endif
 #   be cleaned to prevent garbage from collecting in them when changing
 #   configurations.
 
-NONFSDIRS = sched configs $(ARCH_SRC) $(NUTTX_ADDONS)
+NONFSDIRS = sched drivers configs $(ARCH_SRC) $(NUTTX_ADDONS)
-FSDIRS = fs drivers binfmt
+FSDIRS = fs binfmt
 CONTEXTDIRS = $(APPDIR)
 USERDIRS =
 OTHERDIRS = lib

FlatLibs.mk

@@ -45,6 +45,12 @@
 NUTTXLIBS = lib$(DELIM)libsched$(LIBEXT)
 USERLIBS =
 
+# Driver support.  Generally depends on file descriptor support but there
+# are some components in the drivers directory that are needed even if file
+# descriptors are not supported.
+
+NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
+
 # Add libraries for board support
 
 NUTTXLIBS += lib$(DELIM)libconfigs$(LIBEXT)
@@ -89,11 +95,8 @@ ifeq ($(CONFIG_NFILE_DESCRIPTORS),0)
 ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
 NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT)
 endif
-ifeq ($(CONFIG_NET),y)
-NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
-endif
 else
-NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libdrivers$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
+NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
 endif
 
 # Add libraries for the NX graphics sub-system

KernelLibs.mk

@@ -45,6 +45,12 @@
 NUTTXLIBS = lib$(DELIM)libsched$(LIBEXT)
 USERLIBS =
 
+# Driver support.  Generally depends on file descriptor support but there
+# are some components in the drivers directory that are needed even if file
+# descriptors are not supported.
+
+NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
+
 # Add libraries for board support
 
 NUTTXLIBS += lib$(DELIM)libconfigs$(LIBEXT)
@@ -83,11 +89,8 @@ ifeq ($(CONFIG_NFILE_DESCRIPTORS),0)
 ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
 NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT)
 endif
-ifeq ($(CONFIG_NET),y)
-NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
-endif
 else
-NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libdrivers$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
+NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
 endif
 
 # Add libraries for the NX graphics sub-system

ProtectedLibs.mk

@@ -45,6 +45,12 @@
 NUTTXLIBS = lib$(DELIM)libsched$(LIBEXT)
 USERLIBS =
 
+# Driver support.  Generally depends on file descriptor support but there
+# are some components in the drivers directory that are needed even if file
+# descriptors are not supported.
+
+NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
+
 # Add libraries for board support
 
 NUTTXLIBS += lib$(DELIM)libconfigs$(LIBEXT)
@@ -89,11 +95,8 @@ ifeq ($(CONFIG_NFILE_DESCRIPTORS),0)
 ifneq ($(CONFIG_NSOCKET_DESCRIPTORS),0)
 NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT)
 endif
-ifeq ($(CONFIG_NET),y)
-NUTTXLIBS += lib$(DELIM)libdrivers$(LIBEXT)
-endif
 else
-NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libdrivers$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
+NUTTXLIBS += lib$(DELIM)libfs$(LIBEXT) lib$(DELIM)libbinfmt$(LIBEXT)
 endif
 
 # Add libraries for the NX graphics sub-system

configs/stm32f103-minimum/README.txt

@@ -548,6 +548,16 @@ Where <subdir> is one of the following:
     console device was about 5 KB (primarily OS support) and the cost of
     the NSH 'ls' command (including OS support) is about 2KB.
 
+    2016-02-20:  There has been some size increase due primarily, I believe
+    to the enhanced SYSLOG logic:
+
+     $ arm-none-eabi-size nuttx
+       text    data     bss     dec     hex filename
+      13002       8     816   13826    3602 nuttx
+
+    No single large new things were included in the link.  Apparently
+    several new smaller things are now included.  No idea what.
+
   nsh:
   ---
     Configures the NuttShell (nsh) located at apps/examples/nsh. This