error: void function 'ibus_emojier_clamp_page' should not return a value

[thierry-FreeBSD]

Trying to compile ibus-1.5.19 on FreeBSD, using clang version 6.0.1, fails with the following error:

libtool: compile:  cc -DHAVE_CONFIG_H -I. -I../.. -I../../src -I../../src -include ../../config.h -isystem /usr/local/include -DG_LOG_DOMAIN=\"IBUS\" -DPKGDATADIR=\"/usr/local/share/ibus\" -DIBUS_DISABLE_DEPRECATED -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-function -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include/gio-unix-2.0/ -pthread -pthread -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include/gtk-3.0 -I/usr/local/include/pango-1.0 -I/usr/local/include/glib-2.0 -I/usr/local/lib/glib-2.0/include -I/usr/local/include -I/usr/local/include/cairo -I/usr/local/include/pixman-1 -I/usr/local/include/freetype2 -I/usr/local/include/libdrm -I/usr/local/include/libpng16 -I/usr/local/include/harfbuzz -I/usr/local/include/gdk-pixbuf-2.0 -I/usr/local/include/gio-unix-2.0/ -I/usr/local/include/atk-1.0 -D_THREAD_SAFE -I/usr/local/include/at-spi2-atk/2.0 -I/usr/local/include/at-spi-2.0 -I/usr/local/include/dbus-1.0 -I/usr/local/lib/dbus-1.0/include -pthread -I/usr/local/include -D_THREAD_SAFE -pthread -DBINDIR=\"/usr/local/bin\" -O2 -pipe -fstack-protector -isystem /usr/local/include -fno-strict-aliasing -MT libibus_emoji_dialog_1_0_la-emojier.lo -MD -MP -MF .deps/libibus_emoji_dialog_1_0_la-emojier.Tpo -c emojier.c  -fPIC -DPIC -o .libs/libibus_emoji_dialog_1_0_la-emojier.o
warning: unknown warning option '-Wno-unused-but-set-variable'; did you mean '-Wno-unused-const-variable'? [-Wunknown-warning-option]
emojier.c:1894:10: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                _tmp7_ = g_strcmp0;
                       ^ ~~~~~~~~~
emojier.c:1928:11: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                _tmp21_ = g_strcmp0;
                        ^ ~~~~~~~~~
emojier.c:2065:14: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                        _tmp31_ = g_strcmp0;
                                                ^ ~~~~~~~~~
emojier.c:2123:27: warning: passing 'const gchar *' (aka 'const char *') to parameter of type 'gchar *' (aka 'char *') discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
        g_unichar_to_utf8 (self, _tmp1_);
                                 ^~~~~~
/usr/local/include/glib-2.0/glib/gunicode.h:821:42: note: passing argument to parameter 'outbuf' here
                             gchar      *outbuf);
                                         ^
emojier.c:2172:18: warning: assigning to 'gunichar *' (aka 'unsigned int *') from 'const gunichar [6]' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
                        ch_collection = IBUS_EMOJIER_EMOJI_VARIANT_LIST;
                                      ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
emojier.c:2247:12: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                        _tmp29_ = g_strcmp0;
                                ^ ~~~~~~~~~
emojier.c:3130:2: error: void function 'ibus_emojier_clamp_page' should not return a value [-Wreturn-type]
        g_return_val_if_fail (_tmp22_ >= 0, FALSE);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/glib-2.0/glib/gmessages.h:591:3: note: expanded from macro 'g_return_val_if_fail'
         return (val);                                                  \
         ^      ~~~~~
emojier.c:4692:17: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                                                _tmp23_ = g_strcmp0;
                                                                        ^ ~~~~~~~~~
emojier.c:4700:18: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                                                        _tmp27_ = g_strcmp0;
                                                                                ^ ~~~~~~~~~
emojier.c:4727:14: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                        _tmp32_ = g_strcmp0;
                                                ^ ~~~~~~~~~
emojier.c:4790:13: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                _tmp48_ = g_strcmp0;
                                        ^ ~~~~~~~~~
emojier.c:4862:17: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                                                _tmp66_ = g_strcmp0;
                                                                        ^ ~~~~~~~~~
emojier.c:4870:18: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                                                        _tmp70_ = g_strcmp0;
                                                                                ^ ~~~~~~~~~
emojier.c:4898:14: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                        _tmp75_ = g_strcmp0;
                                                ^ ~~~~~~~~~
emojier.c:5134:9: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
        _tmp2_ = g_strcmp0;
               ^ ~~~~~~~~~
emojier.c:7648:14: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                        _tmp45_ = g_strcmp0;
                                                ^ ~~~~~~~~~
emojier.c:7671:13: warning: incompatible pointer types assigning to 'GCompareFunc' (aka 'int (*)(const void *, const void *)') from 'int (const char *, const char *)' [-Wincompatible-pointer-types]
                                _tmp57_ = g_strcmp0;
                                        ^ ~~~~~~~~~
17 warnings and 1 error generated.
gmake[4]: *** [Makefile:732: libibus_emoji_dialog_1_0_la-emojier.lo] Error 1
gmake[4]: Leaving directory '/usr/ports/textproc/ibus/work/ibus-1.5.19/bindings/vala'
gmake[3]: *** [Makefile:515: all-recursive] Error 1
gmake[3]: Leaving directory '/usr/ports/textproc/ibus/work/ibus-1.5.19/bindings'
gmake[2]: *** [Makefile:687: all-recursive] Error 1
gmake[2]: Leaving directory '/usr/ports/textproc/ibus/work/ibus-1.5.19'
gmake[1]: *** [Makefile:594: all] Error 2
gmake[1]: Leaving directory '/usr/ports/textproc/ibus/work/ibus-1.5.19'
*** Error code 1

[fujiwarat]

Sorry for the typo.