debian: First attempt at creating Debian packages

* debian/: New directory.
* Makefile.am, README: Add it.
* configure.ac: Generate debian/changelog.

debian/rules

@@ -0,0 +1,52 @@
+#!/usr/bin/make -f
+# See debhelper(7) (uncomment to enable)
+# output every command that modifies files on the build system.
+DH_VERBOSE = 1
+
+# see EXAMPLES in dpkg-buildflags(1) and read /usr/share/dpkg/*
+DPKG_EXPORT_BUILDFLAGS = 1
+include /usr/share/dpkg/default.mk
+
+# see FEATURE AREAS in dpkg-buildflags(1)
+#export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+# see ENVIRONMENT in dpkg-buildflags(1)
+# package maintainers to append CFLAGS
+#export DEB_CFLAGS_MAINT_APPEND  = -Wall -pedantic
+# package maintainers to append LDFLAGS
+#export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
+
+
+# main packaging script based on dh7 syntax
+%:
+	dh $@ --parallel
+
+LTOPLUG = /usr/lib/gcc/x86_64-linux-gnu/4.9/liblto_plugin.so
+
+# ARFLAGS is for Automake
+# AR_FLAGS is for Libtool
+LTOSETUP =					\
+  LDFLAGS='-fuse-linker-plugin'			\
+  NM='nm --plugin $(LTOPLUG)'			\
+  ARFLAGS='cru --plugin $(LTOPLUG)'		\
+  AR_FLAGS='cru --plugin $(LTOPLUG)'		\
+  RANLIB='ranlib --plugin $(LTOPLUG)'
+PRO1SETUP =					\
+  CFLAGS='-flto -fprofile-generate'		\
+  CXXFLAGS='-flto -fprofile-generate'
+PRO2SETUP =					\
+  CFLAGS='-flto -fprofile-use'			\
+  CXXFLAGS='-flto -fprofile-use'
+
+# We want to build Spot twice: once to get profile data, and a second
+# time to use it.
+override_dh_auto_configure:
+	dh_auto_configure -- $(PRO1SETUP) $(LTOSETUP)	\
+	  --disable-devel --enable-optimizations	\
+	  --disable-static --disable-python
+	dh_auto_build
+	dh_auto_test
+	make clean
+	dh_auto_configure -- $(PRO2SETUP) $(LTOSETUP)	\
+	  --disable-devel --enable-optimizations	\
+	  --disable-static --disable-python