From f5bc6a420d675d5bd3d98c501fc83561e6a2d12c Mon Sep 17 00:00:00 2001
From: Andreas Huggel <ahuggel@gmx.net>
Date: Fri, 20 Jan 2006 08:45:59 +0000
Subject: [PATCH] Added option to enable/disable dependency-tracking to
 configure script

---
 config/config.mk.in |  9 +++++++--
 config/configure.ac |  7 +++++++
 src/Makefile        | 20 +++++++++++++-------
 3 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/config/config.mk.in b/config/config.mk.in
index 354fd17f..bb01cade 100644
--- a/config/config.mk.in
+++ b/config/config.mk.in
@@ -78,8 +78,11 @@ endif
 # Advanced auto-dependency generation
 # http://make.paulandlesley.org/autodep.html
 
-# Compiler flags to generate dependency files at the same time as object
-# files (for gcc)
+DEP_TRACKING = @DEP_TRACKING@
+
+ifdef DEP_TRACKING
+# Compiler flags to generate dependency files at the same time 
+# as object files (for gcc)
 ifeq ($(GXX),yes)
 	CXXFLAGS += -MMD
 	CFLAGS += -MMD
@@ -92,6 +95,8 @@ else
 	MAKEDEPEND = $(CXX) -MM $(CPPFLAGS) -o $*.d $<
 endif
 
+endif
+
 # **********************************************************************
 # Global includes, libraries and defines
 INCS = -I. 
diff --git a/config/configure.ac b/config/configure.ac
index e9e8ea09..f3df9b60 100644
--- a/config/configure.ac
+++ b/config/configure.ac
@@ -51,6 +51,13 @@ AC_SUBST(HAVE_TIMEGM,$HAVE_TIMEGM)
 AC_SUBST(GXX,$GXX)
 AC_SUBST(GCC,$GCC)
 
+AC_ARG_ENABLE(dependency-tracking,
+[  --disable-dependency-tracking  speeds up one-time build
+  --enable-dependency-tracking   do not reject slow dependency extractors],
+[if test $enableval = yes; then DEP_TRACKING=1; fi],DEP_TRACKING=1)
+
+AC_SUBST(DEP_TRACKING,$DEP_TRACKING)
+
 AC_CONFIG_FILES([./config/config.mk])
 AC_CONFIG_FILES([./config/exiv2-config], [chmod +x ./config/exiv2-config])
 AC_OUTPUT
diff --git a/src/Makefile b/src/Makefile
index fc404a66..a294d13c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -116,13 +116,6 @@ HDR = $(CCHDR)
 OBJ = $(CCOBJ) $(COBJ)
 LOBJ = $(CCLOBJ) $(CLOBJ)
 
-DEPDIR = .deps
-DEP = $(CCSRC:%.cpp=$(DEPDIR)/%.d) $(CSRC:%.c=$(DEPDIR)/%.d) \
-      $(BINSRC:%.cpp=$(DEPDIR)/%.d) \
-      $(EXIV2MAIN:%.cpp=$(DEPDIR)/%.d) $(EXIV2SRC:%.cpp=$(DEPDIR)/%.d) \
-      $(EXIVCSRC:%.c=$(DEPDIR)/%.d) $(MCMAIN:%.cpp=$(DEPDIR)/%.d) \
-      $(MCSRC:%.cpp=$(DEPDIR)/%.d) $(DEPDIR)/path-test.d
-
 BINOBJ = $(BINSRC:.cpp=.o)
 BINARY = $(BINSRC:.cpp=)
 EXECUTABLE = $(BINSRC:.cpp=$(EXEEXT))
@@ -136,12 +129,21 @@ MCOBJ = $(MCMAIN:.cpp=.o) $(MCSRC:.cpp=.o)
 MCBIN = $(MCMAIN:.cpp=)
 MCEXE = $(MCMAIN:.cpp=$(EXEEXT))
 
+ifdef DEP_TRACKING
+DEPDIR = .deps
+DEP = $(CCSRC:%.cpp=$(DEPDIR)/%.d) $(CSRC:%.c=$(DEPDIR)/%.d) \
+      $(BINSRC:%.cpp=$(DEPDIR)/%.d) \
+      $(EXIV2MAIN:%.cpp=$(DEPDIR)/%.d) $(EXIV2SRC:%.cpp=$(DEPDIR)/%.d) \
+      $(EXIVCSRC:%.c=$(DEPDIR)/%.d) $(MCMAIN:%.cpp=$(DEPDIR)/%.d) \
+      $(MCSRC:%.cpp=$(DEPDIR)/%.d) $(DEPDIR)/path-test.d
+
 # Dependency files post-process commands
 POSTDEPEND = if test ! -d $(DEPDIR); then mkdir $(DEPDIR); fi; \
 	     if test -e $*.d; then cp $*.d $(DEPDIR)/$*.d; \
 	     sed -e 's/^\#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
                  -e '/^$$/ d' -e 's/$$/ :/' < $*.d >> $(DEPDIR)/$*.d; \
              $(RM) $*.d; fi
+endif
 
 # Compilation shortcuts
 COMPILE.cc = $(CXX) $(CXXFLAGS) $(CXXDEFS) $(CXXINCS) -c
@@ -181,8 +183,10 @@ $(sort $(BINOBJ) $(EXIV2OBJ) $(MCOBJ) path-test.o): %.o: %.cpp
         install install-header install-lib                             \
         uninstall uninstall-header uninstall-lib
 
+ifdef DEP_TRACKING
 # Include targets from dependency files
 -include $(DEP)
+endif
 
 actions.cpp basicio.cpp exif.cpp exiv2.cpp futils.cpp image.cpp jpgimage.cpp utils.cpp: exv_conf.h
 
@@ -277,8 +281,10 @@ clean: mostlyclean
 # files created by configuring the program.
 distclean: clean
 	$(RM) exv_conf.h
+ifdef DEP_TRACKING
 	$(RM) $(DEP)
 	-rmdir $(DEPDIR)
+endif
 	$(RM) tags TAGS
 	$(RM) *~ *.bak *#