From b95d88a5c4f229a93dab7cad2e0f69d4cd2af42b Mon Sep 17 00:00:00 2001
From: Daniel Collins <solemnwarning@solemnwarning.net>
Date: Sun, 21 Oct 2012 12:08:31 +0000
Subject: [PATCH] Generate header dependencies on the fly using gcc -MM.

---
 Makefile  | 22 ++++++++++++++++++----
 mkdeps.pl | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 4 deletions(-)
 create mode 100644 mkdeps.pl

diff --git a/Makefile b/Makefile
index b6516bf..b2bae55 100644
--- a/Makefile
+++ b/Makefile
@@ -20,9 +20,16 @@ else
 DBG_OPT := -Wl,-s
 endif
 
-CFLAGS := -Wall -D_WIN32_WINNT=0x0500 $(DBG_OPT) -I./include/
+CFLAGS   := -Wall -D_WIN32_WINNT=0x0500 $(DBG_OPT) -I./include/
 CXXFLAGS := $(CFLAGS)
 
+# Used by mkdeps.pl
+#
+export CC
+export CFLAGS
+export CXX
+export CXXFLAGS
+
 VERSION := r$(shell svn info | grep Revision | sed -e 's/.*: //')
 
 IPXWRAPPER_DEPS := src/ipxwrapper.o src/winsock.o src/ipxwrapper_stubs.o src/log.o src/common.o \
@@ -43,7 +50,7 @@ all: ipxwrapper.dll wsock32.dll mswsock.dll ipxconfig.exe dpwsockx.dll ipxrouter
 
 clean:
 	rm -f ipxwrapper.dll wsock32.dll mswsock.dll ipxconfig.exe dpwsockx.dll ipxrouter.exe
-	rm -f src/*.o src/*_stubs.s version.o
+	rm -f src/*.o src/*_stubs.s version.o Makefile.dep
 
 dist: all
 	mkdir ipxwrapper-$(VERSION)
@@ -57,7 +64,14 @@ dist: all
 	rm -r ipxwrapper-$(VERSION)-src/
 
 .SECONDARY:
-.PHONY: all clean dist
+.PHONY: all clean dist depend
+
+depend: Makefile.dep
+
+Makefile.dep: src/*.c src/*.cpp
+	perl mkdeps.pl
+
+-include Makefile.dep
 
 ipxwrapper.dll: $(IPXWRAPPER_DEPS)
 	echo 'const char *version_string = "$(VERSION)", *compile_time = "'`date`'";' | $(CC) -c -x c -o version.o -
@@ -93,5 +107,5 @@ icons/%.o: icons/%.rc icons/%.ico
 src/%_stubs.o: src/%_stubs.s
 	nasm -f win32 -o $@ $<
 
-src/%.o: src/%.c src/ipxwrapper.h src/config.h src/common.h src/router.h
+src/%.o: src/%.c
 	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/mkdeps.pl b/mkdeps.pl
new file mode 100644
index 0000000..8cbb723
--- /dev/null
+++ b/mkdeps.pl
@@ -0,0 +1,34 @@
+# IPXWrapper - Generate Make dependencies
+# Copyright (C) 2012 Daniel Collins <solemnwarning@solemnwarning.net>
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 as published by
+# the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 51
+# Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+use strict;
+use warnings;
+
+my $cc       = $ENV{CC};
+my $cflags   = $ENV{CFLAGS};
+my $cxx      = $ENV{CXX};
+my $cxxflags = $ENV{CXXFLAGS};
+
+open(my $depends, ">Makefile.dep") or die("Cannot open Makefile.dep: $!");
+
+foreach my $cmd((map { "$cc $cflags -MM $_" } glob("src/*.c")), (map { "$cxx $cxxflags -MM $_" } glob("src/*.cpp")))
+{
+	print "mkdeps.pl: $cmd\n";
+	
+	print {$depends} "src/".qx($cmd)."\n";
+}
+
+close($depends);