lib: os: build fdtable conditionally

Stop building fdtable by default, make it conditional and build it only
when needed.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

drivers/wifi/simplelink/Kconfig.simplelink

@@ -8,6 +8,7 @@ menuconfig WIFI_SIMPLELINK
 	select SIMPLELINK_HOST_DRIVER
 	select WIFI_OFFLOAD
 	select NET_L2_WIFI_MGMT
+	select FDTABLE
 
 if WIFI_SIMPLELINK
 

lib/os/CMakeLists.txt

@@ -9,7 +9,6 @@ zephyr_sources_ifdef(CONFIG_BASE64 base64.c)
 zephyr_sources(
   cbprintf_packaged.c
   dec.c
-  fdtable.c
   hex.c
   printk.c
   rb.c
@@ -22,6 +21,7 @@ zephyr_sources(
   multi_heap.c
   )
 
+zephyr_sources_ifdef(CONFIG_FDTABLE fdtable.c)
 zephyr_sources_ifdef(CONFIG_ONOFF onoff.c)
 zephyr_sources_ifdef(CONFIG_NOTIFY notify.c)
 

lib/os/Kconfig

@@ -3,6 +3,13 @@
 
 menu "OS Support Library"
 
+config FDTABLE
+	bool "File descriptor table"
+	help
+	  This file provides generic file descriptor table implementation, suitable
+	  for any I/O object implementing POSIX I/O semantics (i.e. read/write +
+	  aux operations).
+
 config JSON_LIBRARY
 	bool "Build JSON library"
 	help

lib/posix/Kconfig.eventfd

@@ -7,6 +7,7 @@ config EVENTFD
 	bool "Support for eventfd"
 	depends on !NATIVE_APPLICATION
 	select POLL
+	select FDTABLE
 	default y if POSIX_API
 	help
 	  Enable support for event file descriptors, eventfd. An eventfd can

lib/posix/Kconfig.fs

@@ -6,6 +6,7 @@ config POSIX_FS
 	bool "POSIX file system API support"
 	default y if POSIX_API
 	depends on FILE_SYSTEM
+	select FDTABLE
 	help
 	  This enables POSIX style file system related APIs.
 

subsys/net/lib/sockets/Kconfig

@@ -5,6 +5,7 @@
 
 menuconfig NET_SOCKETS
 	bool "BSD Sockets compatible API"
+	select FDTABLE
 	help
 	  Provide BSD Sockets like API on top of native Zephyr networking API.
 

tests/lib/fdtable/prj.conf

@@ -1,3 +1,4 @@
 CONFIG_ZTEST=y
 CONFIG_POSIX_API=y
 CONFIG_ZTEST_NEW_API=y
+CONFIG_FDTABLE=y