[libvirt] [PATCH v4 2/2] src/Makefile: Fix parallel build after xen_xl_disk parser introduction

[Pavel Hrdina]

Well, the parallel build doesn't work as there are not dependencies
set correctly. When running 'make -j' I see this error:

make[2]: Entering directory '/home/zippy/work/libvirt/libvirt.git/src'
  GEN      util/virkeymaps.h
  GEN      locking/lock_protocol.h
make[2]: *** No rule to make target 'xenconfig/xen_xl_disk.h', needed by 'all'.  Stop.
make[2]: *** Waiting for unfinished jobs....
  GEN      lxc/lxc_controller_dispatch.h

The fix is to correctly set dependencies by letting make know that .c
and .h are to be generated from .l. Moreover, the section is moved
closer to the other section which uses it.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
 src/Makefile.am | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 97253e0..ce6182c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1053,12 +1053,21 @@ libvirt_vmx_la_SOURCES = $(VMX_SOURCES)
 endif WITH_VMX
 
 if WITH_XENCONFIG
-AM_LFLAGS = -Pxl_disk_ --header-file=../$*.h
-LEX_OUTPUT_ROOT = lex.xl_disk_
-BUILT_SOURCES += xenconfig/xen_xl_disk.c xenconfig/xen_xl_disk.h
+# Disable the default rule for lex files because we need to generate the
+# xen_xl_disk files into srcdir instead of builddir.
+.l.c:
+
+$(XENXLDISKPARSER_GENERATED): $(XENXLDISKPARSER_SOURCES)
+	$(AM_V_LEX) $(LEXCOMPILE) $<
+
+AM_LFLAGS = -Pxl_disk_ --header-file=$(abs_srcdir)/xenconfig/xen_xl_disk.h \
+		--outfile=$(abs_srcdir)/xenconfig/xen_xl_disk.c
+XENXLDISKPARSER_GENERATED = xenconfig/xen_xl_disk.c xenconfig/xen_xl_disk.h
+
+BUILT_SOURCES += $(XENXLDISKPARSER_GENERATED)
 # Generated header file is not implicitly added to dist
-EXTRA_DIST += xenconfig/xen_xl_disk.h
-CLEANFILES += xenconfig/xen_xl_disk.h xenconfig/xen_xl_disk.c
+EXTRA_DIST += $(XENXLDISKPARSER_GENERATED)
+MAINTAINERCLEANFILES += $(XENXLDISKPARSER_GENERATED)
 
 XENXLDISKPARSER_SOURCES = xenconfig/xen_xl_disk.l
 
@@ -1078,6 +1087,8 @@ libvirt_xenxldiskparser_la_CFLAGS = \
 		-I$(top_srcdir)/src/conf $(AM_CFLAGS) -Wno-unused-parameter
 libvirt_xenxldiskparser_la_SOURCES = \
 	$(XENXLDISKPARSER_SOURCES)
+libvirt_xenxldiskparser_la_DEPENDENCIES = \
+	$(XENXLDISKPARSER_GENERATED)
 
 noinst_LTLIBRARIES += libvirt_xenconfig.la
 libvirt_la_BUILT_LIBADD += libvirt_xenconfig.la
-- 
2.0.5