gettext: force build libintl if needed

This commit introduces a hidden option
BR2_PACKAGE_GETTEXT_PROVIDES_INTL that is used by gettext.mk to force
the build of libintl if the toolchain doesn't provide a full gettext
implementation.

For now, this hidden option is not selected by anything, but a
follow-up commit will introduce BR2_ENABLE_NLS, which will make use of
it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gettext/Config.in

@@ -12,6 +12,14 @@ config BR2_PACKAGE_GETTEXT
 
 	  http://www.gnu.org/software/gettext/
 
+if BR2_PACKAGE_GETTEXT
+
+config BR2_PACKAGE_GETTEXT_PROVIDES_LIBINTL
+	bool
+	depends on !BR2_TOOLCHAIN_HAS_FULL_GETTEXT
+
+endif
+
 comment "gettext needs a toolchain w/ wchar"
 	depends on BR2_NEEDS_GETTEXT
 	depends on !BR2_USE_WCHAR

package/gettext/gettext.mk

@@ -39,6 +39,14 @@ HOST_GETTEXT_CONF_OPTS = \
 	--disable-relocatable \
 	--without-emacs
 
+# Force the build of libintl, even if the C library provides a stub
+# gettext implementation
+ifeq ($(BR2_PACKAGE_GETTEXT_PROVIDES_LIBINTL),y)
+GETTEXT_CONF_OPTS += --with-included-gettext
+else
+GETTEXT_CONF_OPTS += --without-included-gettext
+endif
+
 # For the target version, we only need the runtime, and for the host
 # version, we only need the tools.
 GETTEXT_SUBDIR = gettext-runtime