tree cf907c249c53c3b64dada4b96ff54dd1c14b99f9
parent c9b55f0102d7ea1d2544a9eb27b30120d558f415
author Evan Lloyd <evan.lloyd@arm.com> 1491580737 +0100
committer Evan Lloyd <evan.lloyd@arm.com> 1493746025 +0100

Build: Fix parallel build

2 problems were found, but are in one change to avoid submitting a patch
that might fail to build. The problems were:
1.  The macro MAKE_PREREQ_DIR has a minor bug, in that it is capable of
    generating recursive dependencies.
2.  The inclusion of BUILD_DIR in TEMP_OBJ_DIRS left no explicit
    dependency, BUILD_DIR might not exist when subdirectories are
    created by a thread on another CPU.

This fix corrects these with the following changes:
1.  MAKE_PREREQ_DIR does nothing for a direct self dependency.
2.  BUILD_DIR is built using MAKE_PREREQ_DIR.
3.  BUILD_DIR is an explicit prerequisite of all OBJ_DIRS.

Change-Id: I938cddea4a006df225c02a47b9cf759212f27fb7

Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>