[Xen-devel] [VTPM v6 8/8] Add conditional build of subsystems to configure.ac

[Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>]

The toplevel Makefile still works without running configure
and will default build everything

Signed-off-by: Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
---
 Makefile              |   10 ++++++++--
 config/Toplevel.mk.in |    1 +
 configure.ac          |   11 ++++++++++-
 m4/subsystem.m4       |   32 ++++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 config/Toplevel.mk.in
 create mode 100644 m4/subsystem.m4

diff --git a/Makefile b/Makefile
index a6ed8be..aa3c7bd 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,11 @@
 .PHONY: all
 all: dist
 
+-include config/Toplevel.mk
+SUBSYSTEMS?=xen kernels tools stubdom docs
+TARGS_DIST=$(patsubst %, dist-%, $(SUBSYSTEMS))
+TARGS_INSTALL=$(patsubst %, install-%, $(SUBSYSTEMS))
+
 export XEN_ROOT=$(CURDIR)
 include Config.mk
 
@@ -15,7 +20,7 @@ include buildconfigs/Rules.mk
 
 # build and install everything into the standard system directories
 .PHONY: install
-install: install-xen install-kernels install-tools install-stubdom install-docs
+install: $(TARGS_INSTALL)
 
 .PHONY: build
 build: kernels
@@ -37,7 +42,7 @@ test:
 # build and install everything into local dist directory
 .PHONY: dist
 dist: DESTDIR=$(DISTDIR)/install
-dist: dist-xen dist-kernels dist-tools dist-stubdom dist-docs dist-misc
+dist: $(TARGS_DIST) dist-misc
 
 dist-misc:
        $(INSTALL_DIR) $(DISTDIR)/
@@ -151,6 +156,7 @@ endif
 # clean, but blow away kernel build tree plus tarballs
 .PHONY: distclean
 distclean:
+       -rm config/Toplevel.mk
        $(MAKE) -C xen distclean
        $(MAKE) -C tools distclean
        $(MAKE) -C stubdom distclean
diff --git a/config/Toplevel.mk.in b/config/Toplevel.mk.in
new file mode 100644
index 0000000..4db7eaf
--- /dev/null
+++ b/config/Toplevel.mk.in
@@ -0,0 +1 @@
+SUBSYSTEMS               := @SUBSYSTEMS@
diff --git a/configure.ac b/configure.ac
index 5dacb46..fcbc4ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,16 @@ AC_INIT([Xen Hypervisor], m4_esyscmd([./version.sh 
./xen/Makefile]),
     [xen-devel@xxxxxxxxxxxxx], [xen], [http://www.xen.org/])
 AC_CONFIG_SRCDIR([./xen/common/kernel.c])
 AC_PREFIX_DEFAULT([/usr])
+AC_CONFIG_FILES([./config/Toplevel.mk])
 
-AC_CONFIG_SUBDIRS([tools stubdom])
+m4_include([m4/features.m4])
+m4_include([m4/subsystem.m4])
+
+AX_SUBSYSTEM_DEFAULT_ENABLE([xen])
+AX_SUBSYSTEM_DEFAULT_ENABLE([kernels])
+AX_SUBSYSTEM_DEFAULT_ENABLE([tools])
+AX_SUBSYSTEM_DEFAULT_ENABLE([stubdom])
+AX_SUBSYSTEM_DEFAULT_ENABLE([docs])
+AX_SUBSYSTEM_FINISH
 
 AC_OUTPUT()
diff --git a/m4/subsystem.m4 b/m4/subsystem.m4
new file mode 100644
index 0000000..d3eb8c9
--- /dev/null
+++ b/m4/subsystem.m4
@@ -0,0 +1,32 @@
+AC_DEFUN([AX_SUBSYSTEM_DEFAULT_ENABLE], [
+AC_ARG_ENABLE([$1],
+AS_HELP_STRING([--disable-$1], [Disable build and install of $1]),[
+$1=n
+],[
+$1=y
+SUBSYSTEMS="$SUBSYSTEMS $1"
+AS_IF([test -e "$1/configure"], [
+AC_CONFIG_SUBDIRS([$1])
+])
+])
+AC_SUBST($1)
+])
+
+AC_DEFUN([AX_SUBSYSTEM_DEFAULT_DISABLE], [
+AC_ARG_ENABLE([$1],
+AS_HELP_STRING([--enable-$1], [Enable build and install of $1]),[
+$1=y
+SUBSYSTEMS="$SUBSYSTEMS $1"
+AS_IF([test -e "$1/configure"], [
+AC_CONFIG_SUBDIRS([$1])
+])
+],[
+$1=n
+])
+AC_SUBST($1)
+])
+
+
+AC_DEFUN([AX_SUBSYSTEM_FINISH], [
+AC_SUBST(SUBSYSTEMS)
+])
-- 
1.7.10.4


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