build: bootstrap overhaul

Put an end to the constant autoreconfs when switching branches. Use make to
determine when bootstrapping for xbmc and subprojects needs to happen
(hint: rarely).

bootstrapping can now be done in parallel, but I didn't obseve much (any?)
speed increase.

Also allows for easier skipping of reconfigures for minor/cosmetic configure.in
changes.

This should be transparent to users, other than the fact that it's much faster.

Same build procedure as always: ./bootstrap && ./configure && make

3 files changed, 42 insertions, 32 deletions

diff --git a/Makefile.in b/Makefile.in
index d06ff45bee..cdde76fd27 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,3 +1,5 @@
+include bootstrap.mk
+
 AUTOGENERATED_MAKEFILES=@OUTPUT_FILES@
 
 EC_DIRS= \
@@ -280,13 +282,6 @@ Makefile : config.status $(addsuffix .in, $(AUTOGENERATED_MAKEFILES))
 	@echo "done"
 
 config.status: configure
-	@echo "Build system configuration is stale."
-	@echo "Please (re)run configure."
-	@test -n "$$XBMC_IGNORE_STALE"
-
-configure: configure.in
-	@echo 'configure is outdated, regenerating...'
-	@./bootstrap
 
 # skin textures
 ifeq (@USE_TEXTUREPACKER@,1)
diff --git a/bootstrap b/bootstrap
index 86b5189975..09dc378df8 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,26 +1,2 @@
 #!/bin/sh
-
-set -e
-
-autoreconf -vif
-autoreconf -vif lib/libid3tag/libid3tag
-autoreconf -vif xbmc/screensavers/rsxs-0.9
-autoreconf -vif xbmc/visualizations/Goom/goom2k4-0
-autoreconf -vif lib/libapetag
-autoreconf -vif lib/cpluff
-# order matters with libdvd and friends
-[ -d lib/libdvd/libdvdcss ] && \
-  autoreconf -vif lib/libdvd/libdvdcss
-autoreconf -vif lib/libdvd/libdvdread
-autoreconf -vif lib/libdvd/libdvdnav
-autoreconf -vif lib/gtest
-
-if [ -f pvr-addons/Makefile.am ]; then
-  autoreconf -vif pvr-addons
-fi
-
-# Clean the generated files
-find . -depth -type d -name "autom4te.cache" -exec rm -rf {} \;
-
-echo "Please (re)run configure..."
-
+BOOTSTRAP_STANDALONE=1 make -f bootstrap.mk
diff --git a/bootstrap.mk b/bootstrap.mk
new file mode 100644
index 0000000000..b4dfe13194
--- /dev/null
+++ b/bootstrap.mk
@@ -0,0 +1,39 @@
+BOOTSTRAP_SUBDIRS += configure.in
+BOOTSTRAP_SUBDIRS += lib/libid3tag/libid3tag/configure.ac
+BOOTSTRAP_SUBDIRS += xbmc/screensavers/rsxs-0.9/configure.ac
+BOOTSTRAP_SUBDIRS += xbmc/visualizations/Goom/goom2k4-0/configure.in
+BOOTSTRAP_SUBDIRS += lib/libapetag/configure.in
+BOOTSTRAP_SUBDIRS += lib/cpluff/configure.ac
+BOOTSTRAP_SUBDIRS += lib/gtest/configure.ac
+
+ifneq ($(wildcard lib/libdvd/libdvdcss/configure.ac),)
+BOOTSTRAP_SUBDIRS += lib/libdvd/libdvdcss/configure.ac
+DVD_CSS=lib/libdvd/libdvdcss/configure
+endif
+BOOTSTRAP_SUBDIRS += lib/libdvd/libdvdread/configure.ac
+BOOTSTRAP_SUBDIRS += lib/libdvd/libdvdnav/configure.ac
+
+ifneq ($(wildcard pvr-addons/Makefile.am),)
+BOOTSTRAP_SUBDIRS += pvr-addons/configure.ac
+endif
+
+BOOTSTRAP_TARGETS=$(basename $(BOOTSTRAP_SUBDIRS))
+all: $(BOOTSTRAP_TARGETS)
+
+#preserve order for libdvd. dvdcss (if present) -> dvdread -> dvdnav.
+lib/libdvd/libdvdread/configure: $(DVD_CSS)
+lib/libdvd/libdvdnav/configure: lib/libdvd/libdvdread/configure
+
+%: %.ac
+	autoreconf -vif $(@D)
+	-@rm -rf $(@D)/autom4te.cache
+
+%: %.in
+	autoreconf -vif $(@D)
+	-@rm -rf $(@D)/autom4te.cache
+
+configure: configure.in
+	autoreconf -vif $(@D)
+	-@rm -rf $(@D)/autom4te.cache
+	@test -n "$$BOOTSTRAP_STANDALONE" || ( echo "Configuration is stale. You should almost certainly reconfigure" && false )
+