back to AC_LANG_C[PLUSPLUS] variants

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@4968 a592a061-630c-0410-9148-cb99ea01b6c8

config/gtk--.m4

@@ -42,7 +42,7 @@ AC_ARG_ENABLE(gtkmmtest, [  --disable-gtkmmtest     Do not try to compile and ru
     no_gtkmm=yes
   else
     AC_LANG_SAVE
-    AC_LANG(C++)
+    AC_LANG_CPLUSPLUS
 
     GTKMM_CFLAGS=`$GTKMM_CONFIG $gtkmm_config_args --cflags`
     GTKMM_LIBS=`$GTKMM_CONFIG $gtkmm_config_args --libs`

config/libtool.m4

@@ -103,7 +103,7 @@ case $host in
   CFLAGS="$CFLAGS -belf"
   AC_CACHE_CHECK([whether the C compiler needs -belf], lt_cv_cc_needs_belf,
     [AC_LANG_SAVE
-     AC_LANG(C)
+     AC_LANG_C
      AC_TRY_LINK([],[],[lt_cv_cc_needs_belf=yes],[lt_cv_cc_needs_belf=no])
      AC_LANG_RESTORE])
   if test x"$lt_cv_cc_needs_belf" != x"yes"; then

config/qt2.m4

@@ -125,7 +125,7 @@ AC_DEFUN(QT2_AC_PATH_MOC,
 
 AC_DEFUN(QT2_PRINT_PROGRAM,
 [
-AC_LANG(C++)
+AC_LANG_CPLUSPLUS
 cat > conftest.$ac_ext <<EOF
 #include "confdefs.h"
 #include <qmovie.h>
@@ -301,7 +301,7 @@ dnl check it is Qt2
 SAVE_CXXFLAGS="$CXXFLAGS"
 CXXFLAGS="$CXXFLAGS -I$qt2_includes -L$qt2_libraries"
 dnl specify we are definitely C++ compiling first
-AC_LANG(C++)
+AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
 #include <qglobal.h>
 ],

config/xforms.m4

@@ -70,7 +70,7 @@ save_LIBS=$LIBS
 LIBS="$XFORMS_LIB $LIBS"
 lyx_use_xforms_image_loader=no
 AC_LANG_SAVE
-AC_LANG(C)
+AC_LANG_C
 
 AC_CHECK_LIB(jpeg, jpeg_read_header,
   [XFORMS_IMAGE_LIB=-ljpeg