kconfig: fix update-po-config

Massimo Maiurana <maiurana@gmail.com> reported that
update-po-config was broken:
1) spelling errors in Makefile so arch/um failed
2) UTF-8 was not supported

The following patch address the above problems.
kxgettext now append the output to the .pot file
generated by xgettext - so we have a header.
In all places UFT-8 is specifed so we now flawlessly
support UTF-8.
The Kconfig files had an empty string in a few cases -
these are now supressed in kxgettext.

With this the translators can now pick up where they left
and get it all translated.
There are ~11000 strings to be translated...

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc:  Massimo Maiurana <maiurana@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>

2 files changed, 21 insertions, 18 deletions

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index fb2bb3099dd9..8986a48c8c49 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -22,24 +22,25 @@ oldconfig: $(obj)/conf
 silentoldconfig: $(obj)/conf
         $< -s arch/$(ARCH)/Kconfig
 
+# Create new linux.po file
+# Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files
+# The symlink is used to repair a deficiency in arch/um
 update-po-config: $(obj)/kxgettext
-        xgettext --default-domain=linux \
-          --add-comments --keyword=_ --keyword=N_ \
-          --files-from=scripts/kconfig/POTFILES.in \
-          --output scripts/kconfig/config.pot
-        $(Q)ln -fs Kconfig_i386 arch/um/Kconfig_arch
-        $(Q)for i in `ls arch/`; \
-        do \
-          scripts/kconfig/kxgettext arch/$$i/Kconfig \
-            | msguniq -o scripts/kconfig/linux_$${i}.pot; \
-        done
-        $(Q)msgcat scripts/kconfig/config.pot \
-          `find scripts/kconfig/ -type f -name linux_*.pot` \
-          --output scripts/kconfig/linux_raw.pot
-        $(Q)msguniq --sort-by-file scripts/kconfig/linux_raw.pot \
-            --output scripts/kconfig/linux.pot
-        $(Q)rm -f arch/um/Kconfig_arch
-        $(Q)rm -f scripts/kconfig/linux_*.pot scripts/kconfig/config.pot
+        xgettext --default-domain=linux                  \
+            --add-comments --keyword=_ --keyword=N_      \
+            --from-code=UTF-8                            \
+            --files-from=scripts/kconfig/POTFILES.in     \
+            --output $(obj)/config.pot
+        $(Q)sed -i s/CHARSET/UTF-8/ $(obj)/config.pot
+        $(Q)ln -fs Kconfig.i386 arch/um/Kconfig.arch
+        (for i in `ls arch/`;                            \
+        do                                               \
+            $(obj)/kxgettext arch/$$i/Kconfig;           \
+        done ) >> $(obj)/config.pot
+        msguniq --sort-by-file --to-code=UTF-8 $(obj)/config.pot \
+            --output $(obj)/linux.pot
+        $(Q)rm -f arch/um/Kconfig.arch
+        $(Q)rm -f $(obj)/config.pot
 
 PHONY += randconfig allyesconfig allnoconfig allmodconfig defconfig
 
diff --git a/scripts/kconfig/kxgettext.c b/scripts/kconfig/kxgettext.c
index abee55ca6174..11f7dab94715 100644
--- a/scripts/kconfig/kxgettext.c
+++ b/scripts/kconfig/kxgettext.c
@@ -212,7 +212,9 @@ void menu__xgettext(void)
         struct message *m = message__list;
 
         while (m != NULL) {
-                message__print_gettext_msgid_msgstr(m);
+                /* skip empty lines ("") */
+                if (strlen(m->msg) > sizeof("\"\""))
+                        message__print_gettext_msgid_msgstr(m);
                 m = m->next;
         }
 }