Implement translation support for ScummVM GUI.

Based on patch #2903830: "Updated Translation Prototype" by alexbevi
which in turn is based on patch #1739965 by jvprat.

Currently it builds all translations right into ScummVM. Once the
feature will be accepted more widely, i.e. more translations will
pop up, it will be trivial to move translation strings to external
file.

Finished translation: Russian
Unfinished translation: Hungarian

Things which are nice to do:
 - Language code -> language mapping for more user friendness
 - Specifying fonts to be used with language
 - Updating of interface language without restart. It will require
   moving of much code to reflowLayout() methods for each dialog

The .po files must be in single byte encodings. I.e. no support
for Unicode.

svn-id: r49759

1 files changed, 46 insertions, 0 deletions

diff --git a/configure b/configure
index cb2f690441..56827b3855 100755
--- a/configure
+++ b/configure
@@ -136,6 +136,8 @@ _enable_prof=no
 # Default vkeybd/keymapper options
 _vkeybd=no
 _keymapper=no
+# GUI translation options
+_translation=yes
 # Default platform settings
 _backend=sdl
 _endian=unknown
@@ -676,6 +678,7 @@ Optional Features:
   --disable-16bit          don't enable 16bit color support
   --disable-scalers        exclude scalers
   --disable-hq-scalers     exclude HQ2x and HQ3x scalers
+  --disable-translation    don't build support for translated messages
   --enable-text-console    use text console instead of graphical console
   --enable-verbose-build   enable regular echoing of commands during build process
 
@@ -760,6 +763,8 @@ for ac_option in $@; do
 	--default-dynamic)        _plugins_default=dynamic ;;
 	--enable-mt32emu)         _mt32emu=yes    ;;
 	--disable-mt32emu)        _mt32emu=no     ;;
+	--enable-translation)     _translation=yes ;;
+	--disable-translation)    _translation=no ;;
 	--enable-vkeybd)          _vkeybd=yes     ;;
 	--disable-vkeybd)         _vkeybd=no      ;;
 	--enable-keymapper)       _keymapper=yes  ;;
@@ -2312,6 +2317,47 @@ if test "$_keymapper" = yes ; then
 	DEFINES="$DEFINES -DENABLE_KEYMAPPER"
 fi
 
+# Check whether to build translation support
+#
+echo_n "Building translation support... "
+add_to_config_mk_if_yes $_translation 'ENABLE_TRANSLATION = 1'
+add_to_config_h_if_yes $_translation '#define TRANSLATION'
+if test "$_translation" = no ; then
+	echo "no"
+else
+	echo_n "yes ("
+
+	cat > $TMPC << EOF
+#include <locale.h>
+int main(void) { setlocale(LC_ALL, ""); return 0; }
+EOF
+	_detectlang=no
+	cc_check $LDFLAGS $CXXFLAGS && _detectlang=yes
+
+	add_to_config_h_if_yes $_detectlang '#define DETECTLANG'
+	if test "$_detectlang" = yes ; then
+		echo_n "with runtime language detection, "
+
+		cat > $TMPC << EOF
+#include <langinfo.h>
+#include <iconv.h>
+int main(void) { nl_langinfo(CODESET); iconv_open(0, 0); return 0; }
+EOF
+		_termconv=no
+		cc_check_no_clean $LDFLAGS $CXXFLAGS && _termconv=yes
+		cc_check $LDFLAGS $CXXFLAGS -liconv && LIBS="$LIBS -liconv" && _termconv=yes
+
+		add_to_config_h_if_yes $_termconv '#define TERMCONV'
+		if test "$_termconv" = yes ; then
+			echo "with terminal conversion)"
+		else
+			echo "without terminal conversion)"
+		fi
+	else
+		echo "without runtime language detection)"
+	fi
+fi
+
 #
 # Figure out installation directories
 #