[coreboot-gerrit] Patch merged into coreboot/master: a32b6f0 Makefile: Avoid duplicate class suffixes in $(call src-to-obj)

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit a32b6f0b7d3f35f58d2cfefd8d28c46a80a78ef7
Author: Julius Werner <jwerner at chromium.org>
Date:   Thu Mar 12 23:17:16 2015 -0700

    Makefile: Avoid duplicate class suffixes in $(call src-to-obj)
    
    The build system uses the $(src-to-obj) function in multiple places to
    figure out the corresponding output object file for a certan source
    file, most importantly when generating the rule to build it. Usually
    this is pretty simple, but some odd cases are a little tricky... such as
    the auto-generated intermediary C files containing an array definition
    generated from an ASL file. These files have already been compiled per
    stage, so they contain the stage as a suffix and reside in the build
    directory (e.g. build/.../dsdt.ramstage.c).
    
    The previous $(src-to-obj) implementation just blindly appends the stage
    again and turns this into build/.../dsdt.ramstage.ramstage.o. This isn't
    very useful, so to avoid confusion this patch makes it strip additional
    stage suffixes for those intermediary files.
    
    This also fixes a bug with the ASL postprocessor, which didn't take this
    double suffix into account: it added build/.../dsdt.ramstage.o to
    ramstage-objs which should've been build/.../dsdt.ramstage.ramstage.o.
    This only worked by accident because make compiled the file with its
    implicit %.o: %.c rule instead.
    
    BRANCH=none
    BUG=chromium:466469
    TEST=emerge-falco coreboot with the new make 4.1. Also build Falco and
    Veyron_Jerry with make -r -R to make sure there are no other accidental
    uses of implicit rules in our build system.
    
    Change-Id: I4aeaa60add1ef4215cb6c0b222c3886395c7a045
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: d9ea2e082eca1045409ea1f403082c97dedc70d8
    Original-Change-Id: I951edbc9f653321a9084543a65009c6e9154d819
    Original-Signed-off-by: Julius Werner <jwerner at chromium.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/259950
    Original-Reviewed-by: Mike Frysinger <vapier at chromium.org>
    Original-Reviewed-by: Patrick Georgi <pgeorgi at chromium.org>
    Reviewed-on: http://review.coreboot.org/9861
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>


See http://review.coreboot.org/9861 for details.

-gerrit