package/boost: boost-filesystem needs wchar

Also add reverse dependency for cc-tool.

Fixes:
http://autobuild.buildroot.net/results/2c7/2c7783b7f3cc28d54d15a7f017442c48244ffd8e/
http://autobuild.buildroot.net/results/2c7/2c7783b7f3cc28d54d15a7f017442c48244ffd8e/
http://autobuild.buildroot.net/results/0dd/0dd3ef96bbd034a41d908cdaa6552b27fda78132/
http://autobuild.buildroot.net/results/34b/34b55b2cd83fd5d87af4a9c15d05094b16ef3960/

and many more

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/boost/Config.in

@@ -77,6 +77,10 @@ config BR2_PACKAGE_BOOST_EXCEPTION
 
 config BR2_PACKAGE_BOOST_FILESYSTEM
 	bool "boost-filesystem"
+	depends on BR2_USE_WCHAR
+
+comment "boost-filesystem needs a toolchain w/ wchar"
+	depends on !BR2_USE_WCHAR
 
 config BR2_PACKAGE_BOOST_GRAPH
 	bool "boost-graph"

package/cc-tool/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_CC_TOOL
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_PACKAGE_BOOST_ARCH_SUPPORTS
+	depends on BR2_USE_WCHAR # boost-filesystem
 	select BR2_PACKAGE_LIBUSB
 	select BR2_PACKAGE_BOOST
 	select BR2_PACKAGE_BOOST_PROGRAM_OPTIONS
@@ -17,6 +18,6 @@ config BR2_PACKAGE_CC_TOOL
 
 	  http://sourceforge.net/projects/cctool/
 
-comment "cc-tool needs a toolchain w/ C++, threads"
+comment "cc-tool needs a toolchain w/ C++, threads, wchar"
 	depends on BR2_PACKAGE_BOOST_ARCH_SUPPORTS
-	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS || !BR2_USE_WCHAR