[PATCH] Let GCC generate deps with -MD.

[Johan Rydberg <jrydberg@night.trouble.net>]

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Hi,

Instead of generating the dependencies separately it can be done the
first time a file is compiled, with the -MD option to GCC.  

Comments?

2006-08-12  Johan Rydberg  <jrydberg@gnu.org>

	* genmk.rb: Let GCC generate dependenceies the first time it
	compiles a file; using the -MD option.


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Index: genmk.rb
===================================================================
RCS file: /sources/grub/grub2/genmk.rb,v
retrieving revision 1.25
diff -u -r1.25 genmk.rb
--- genmk.rb	2 Jun 2006 19:33:58 -0000	1.25
+++ genmk.rb	12 Aug 2006 15:47:35 -0000
@@ -71,14 +71,7 @@
       dir = File.dirname(src)
       
       "#{obj}: #{src}
-	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) #{extra_flags} $(TARGET_#{flag}) $(#{prefix}_#{flag}) -c -o $@ $<
-
-#{dep}: #{src}
-	set -e; \
-	  $(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) #{extra_flags} $(TARGET_#{flag}) $(#{prefix}_#{flag}) -M $< \
-	  | sed 's,#{Regexp.quote(fake_obj)}[ :]*,#{obj} $@ : ,g' > $@; \
-	  [ -s $@ ] || rm -f $@
-
+	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) #{extra_flags} $(TARGET_#{flag}) $(#{prefix}_#{flag}) -MD -c -o $@ $<
 -include #{dep}
 
 "
@@ -153,14 +146,7 @@
       dir = File.dirname(src)
 
       "#{obj}: #{src}
-	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_#{flag}) $(#{prefix}_#{flag}) -c -o $@ $<
-
-#{dep}: #{src}
-	set -e; \
-	  $(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_#{flag}) $(#{prefix}_#{flag}) -M $< \
-	  | sed 's,#{Regexp.quote(fake_obj)}[ :]*,#{obj} $@ : ,g' > $@; \
-	  [ -s $@ ] || rm -f $@
-
+	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_#{flag}) $(#{prefix}_#{flag}) -MD -c -o $@ $<
 -include #{dep}
 
 CLEANFILES += #{command} #{fs}
@@ -213,14 +199,7 @@
       dir = File.dirname(src)
 
       "#{obj}: #{src}
-	$(CC) -I#{dir} -I$(srcdir)/#{dir} $(CPPFLAGS) $(CFLAGS) -DGRUB_UTIL=1 $(#{prefix}_CFLAGS) -c -o $@ $<
-
-#{dep}: #{src}
-	set -e; \
-	  $(CC) -I#{dir} -I$(srcdir)/#{dir} $(CPPFLAGS) $(CFLAGS) -DGRUB_UTIL=1 $(#{prefix}_CFLAGS) -M $< \
-	  | sed 's,#{Regexp.quote(fake_obj)}[ :]*,#{obj} $@ : ,g' > $@; \
-	  [ -s $@ ] || rm -f $@
-
+	$(CC) -I#{dir} -I$(srcdir)/#{dir} $(CPPFLAGS) $(CFLAGS) -DGRUB_UTIL=1 $(#{prefix}_CFLAGS) -MD -c -o $@ $<
 -include #{dep}
 
 "
@@ -258,14 +237,7 @@
       dir = File.dirname(src)
 
       "#{obj}: #{src}
-	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(#{prefix}_CFLAGS) -c -o $@ $<
-
-#{dep}: #{src}
-	set -e; \
-	  $(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(#{prefix}_CFLAGS) -M $< \
-	  | sed 's,#{Regexp.quote(fake_obj)}[ :]*,#{obj} $@ : ,g' > $@; \
-	  [ -s $@ ] || rm -f $@
-
+	$(TARGET_CC) -I#{dir} -I$(srcdir)/#{dir} $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(#{prefix}_CFLAGS) -MD -c -o $@ $<
 -include #{dep}
 
 "