Support for generating dependency information with gcc 2.95.

Makefile.in

@@ -53,6 +53,7 @@ install_sh_PROGRAM = $(install_sh) -c
 install_sh_SCRIPT = $(install_sh) -c
 INSTALL_SCRIPT = @INSTALL_SCRIPT@
 INSTALL_HEADER = $(INSTALL_DATA)
+GCC_DEP_STYLE = @GCC_DEP_STYLE@
 
 # Variable stuff as set by configure
 BZ2_LIBS = @BZ2_LIBS@
@@ -221,12 +222,22 @@ depend:
 	@echo Calculating dependecies:
 	@rm -f .depend
 	@touch .depend
+ifeq (v2,$(GCC_DEP_STYLE))
+	@for i in $(ALL_SOURCES); do \
+		o="`dirname "$$i"`/" ; \
+		echo ' CXX -MM '$$i ; \
+		$(CXX) $(CXXFLAGS) $(INCLUDES) $(SYSTEM_INCLUDES) -MM $$i | \
+		awk 'BEGIN { pfx="'$$o'" } { print pfx $$0 ; pfx="" }' \
+		>> .depend ; \
+	done
+else
 	@for i in $(ALL_SOURCES); do \
 		o="`echo $$i | sed -e 's/\.c$$/.o/' -e 's/\.cpp$$/.o/'`" ; \
-		echo '  ' $$i: $$o ; \
+		echo ' CXX -MM '$$i ; \
 		$(CXX) $(CXXFLAGS) $(INCLUDES) $(SYSTEM_INCLUDES) -MM \
 		-MT $$o $$i >> .depend ; \
 	done
+endif
 
 update-po:
 	xgettext --keyword=_ --keyword=N_ --default-domain=mkvtoolnix \

configure.in

@@ -160,12 +160,34 @@ AC_SUBST(PROFILING_LIBS)
 AC_SUBST(OPTIMIZATION_CFLAGS)
 
 
+dnl
+dnl Check the gcc version for the genreation of dependecy information
+dnl
+AC_CACHE_CHECK([gcc version],
+  [ac_cv_gcc_version],[
+  ac_cv_gcc_version="`$CXX -dumpversion`"
+  ])
+
+case "$ac_cv_gcc_version" in
+  2.*)
+    GCC_DEP_STYLE=v2
+    ;;
+  3.*)
+    GCC_DEP_STYLE=v3
+    ;;
+  *)
+    GCC_DEP_STYLE=v3
+    ;;
+esac
+
+AC_SUBST(GCC_DEP_STYLE)
+
 dnl
 dnl Check for mingw
 dnl
 AC_CACHE_CHECK([if being compiled with mingw32],
   [ac_cv_mingw32],[
-  if test "x`gcc --version | grep -i mingw`" = "x" ; then
+  if test "x`$CXX --version | grep -i mingw`" = "x" ; then
     ac_cv_mingw32=no
   else
     ac_cv_mingw32=yes