[Buildroot] [PATCH v8 RESEND 3/8] package: add support for top-level parallel make

[Fabio Porcedda]

To be able to use top-level parallel make we must not depend in a rule
on the order of evaluation of the prerequisites, so instead of relyng on
the left to right ordering of evaluation of the prerequisites add an
explicit rule to describe the dependencies.
So add explicit dependencies for the following stamp files:
   %/.stamp_extracted
   %/.stamp_patched
   %/.stamp_configured
   %/.stamp_built
   %/.stamp_host_installed
   %/.stamp_staging_installed
   %/.stamp_images_installed
   %/.stamp_target_installed

Because the %-build target is not anymore part of the dependency chain,
add a new variable <pkgname>_BUILD_DEPENDENCIES to be used instead.
This new variable is used only by uclibc and glibc packages.

Signed-off-by: Fabio Porcedda <fabio.porcedda at gmail.com>
---
 package/glibc/glibc.mk   |  2 +-
 package/pkg-generic.mk   | 38 +++++++++++++++++++++-----------------
 package/uclibc/uclibc.mk |  2 +-
 3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/package/glibc/glibc.mk b/package/glibc/glibc.mk
index 68b98a9..e89c12a 100644
--- a/package/glibc/glibc.mk
+++ b/package/glibc/glibc.mk
@@ -27,7 +27,7 @@ GLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO
 GLIBC_DEPENDENCIES = host-gcc-initial linux-headers host-gawk
 
 # Before (e)glibc is built, we must have the second stage cross-compiler
-glibc-build: host-gcc-intermediate
+GLIBC_BUILD_DEPENDENCIES = host-gcc-intermediate
 
 GLIBC_SUBDIR = build
 
diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index 3f19aea..094868c 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -317,6 +317,7 @@ $(2)_DEPENDENCIES ?= $(filter-out  host-toolchain $(1),\
 ifeq ($$($(2)_TYPE)-$$($(2)_ADD_TOOLCHAIN_DEPENDENCY),target-YES)
 $(2)_DEPENDENCIES += toolchain
 endif
+$(2)_BUILD_DEPENDENCIES		?=
 
 $(2)_INSTALL_STAGING		?= NO
 $(2)_INSTALL_IMAGES		?= NO
@@ -368,30 +369,34 @@ $(1)-install:		$(1)-install-staging $(1)-install-target $(1)-install-images
 endif
 
 ifeq ($$($(2)_INSTALL_TARGET),YES)
-$(1)-install-target:	$(1)-build \
-			$$($(2)_TARGET_INSTALL_TARGET)
+$(1)-install-target:	$$($(2)_TARGET_INSTALL_TARGET)
 else
 $(1)-install-target:
 endif
 
 ifeq ($$($(2)_INSTALL_STAGING),YES)
-$(1)-install-staging:	$(1)-build \
-			$$($(2)_TARGET_INSTALL_STAGING)
+$(1)-install-staging:	$$($(2)_TARGET_INSTALL_STAGING)
 else
 $(1)-install-staging:
 endif
 
 ifeq ($$($(2)_INSTALL_IMAGES),YES)
-$(1)-install-images:	$(1)-build \
-			$$($(2)_TARGET_INSTALL_IMAGES)
+$(1)-install-images:	$$($(2)_TARGET_INSTALL_IMAGES)
 else
 $(1)-install-images:
 endif
 
-$(1)-install-host:      $(1)-build $$($(2)_TARGET_INSTALL_HOST)
+$(1)-install-host:      $$($(2)_TARGET_INSTALL_HOST)
 
-$(1)-build:		$(1)-configure \
-			$$($(2)_TARGET_BUILD)
+$$($(2)_TARGET_INSTALL_TARGET) $$($(2)_TARGET_INSTALL_STAGING) \
+$$($(2)_TARGET_INSTALL_IMAGES) $$($(2)_TARGET_INSTALL_HOST): \
+	$$($(2)_TARGET_BUILD)
+
+$(1)-build:		$$($(2)_TARGET_BUILD)
+$$($(2)_TARGET_BUILD):	$$($(2)_TARGET_CONFIGURE) | $$($(2)_BUILD_DEPENDENCIES)
+
+$(1)-configure:			$$($(2)_TARGET_CONFIGURE)
+$$($(2)_TARGET_CONFIGURE):	| $$($(2)_DEPENDENCIES)
 
 $$($(2)_TARGET_SOURCE) $$($(2)_TARGET_RSYNC): | dependencies dirs prepare
 
@@ -402,13 +407,13 @@ ifeq ($$($(2)_OVERRIDE_SRCDIR),)
 #  extract
 #  patch
 #  configure
-$(1)-configure:		$(1)-patch $(1)-depends \
-			$$($(2)_TARGET_CONFIGURE)
+$$($(2)_TARGET_CONFIGURE):	$$($(2)_TARGET_PATCH)
 
-$(1)-patch:		$(1)-extract $$($(2)_TARGET_PATCH)
+$(1)-patch:		$$($(2)_TARGET_PATCH)
+$$($(2)_TARGET_PATCH):	$$($(2)_TARGET_EXTRACT)
 
-$(1)-extract:		$(1)-source \
-			$$($(2)_TARGET_EXTRACT)
+$(1)-extract:			$$($(2)_TARGET_EXTRACT)
+$$($(2)_TARGET_EXTRACT):	$$($(2)_TARGET_SOURCE)
 
 $(1)-depends:		$$($(2)_DEPENDENCIES)
 
@@ -418,10 +423,9 @@ else
 #  source, by rsyncing
 #  depends
 #  configure
-$(1)-configure:		$(1)-depends \
-			$$($(2)_TARGET_CONFIGURE)
+$$($(2)_TARGET_CONFIGURE):	$$($(2)_TARGET_RSYNC)
 
-$(1)-depends:		$(1)-rsync $$($(2)_DEPENDENCIES)
+$(1)-depends:		$$($(2)_DEPENDENCIES)
 
 $(1)-patch:		$(1)-rsync
 $(1)-extract:		$(1)-rsync
diff --git a/package/uclibc/uclibc.mk b/package/uclibc/uclibc.mk
index 0d12afd..dea36e7 100644
--- a/package/uclibc/uclibc.mk
+++ b/package/uclibc/uclibc.mk
@@ -26,7 +26,7 @@ UCLIBC_ADD_TOOLCHAIN_DEPENDENCY = NO
 UCLIBC_DEPENDENCIES = host-gcc-initial linux-headers
 
 # Before uClibc is built, we must have the second stage cross-compiler
-uclibc-build: host-gcc-intermediate
+UCLIBC_BUILD_DEPENDENCIES = host-gcc-intermediate
 
 # specifying UCLIBC_CONFIG_FILE on the command-line overrides the .config
 # setting.
-- 
1.8.4