Eric Lee / smarc-uboot

20 Feb, 2014

6 commits

  • 9a368d0f5   kbuild: Do not generate .*.su files at the top directory ... Browse Code »

    Without this workaround, you will see a lot of ".*.su" files
    at the top directory after building with a compiler
    which supports "-fstack-usage" option.

    Signed-off-by: Masahiro Yamada

    Masahiro Yamada
     
  • 6825a95b0   kbuild: use Linux Kernel build scripts ... Browse Code »

    Now we are ready to switch over to real Kbuild.

    This commit disables temporary scripts:
    scripts/{Makefile.build.tmp, Makefile.host.tmp}
    and enables real Kbuild scripts:
    scripts/{Makefile.build,Makefile.host,Makefile.lib}.

    This switch is triggered by the line in scripts/Kbuild.include
    -build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build.tmp obj
    +build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

    We need to adjust some build scripts for U-Boot.
    But smaller amount of modification is preferable.

    Additionally, we need to fix compiler flags which are
    locally added or removed.

    In Kbuild, it is not allowed to change CFLAGS locally.
    Instead, ccflags-y, asflags-y, cppflags-y,
    CFLAGS_$(basetarget).o, CFLAGS_REMOVE_$(basetarget).o
    are prepared for that purpose.

    Signed-off-by: Masahiro Yamada
    Tested-by: Gerhard Sittig

    Masahiro Yamada
     
  • ec626f113   Makefile: rename scripts/Makefile.build to scripts/Makefile.build.tmp ... Browse Code »

    Some build scripts including scripts/Makefile.build
    will be imported from Linux Kernel in the next commit.
    We need to adjust them for U-Boot in the following commits.

    To make it easier for reviewers to track the modification,
    this commit renames scripts/Makefile.build to
    scripts/Makefile.build.tmp beforehand.

    Signed-off-by: Masahiro Yamada

    Masahiro Yamada
     
  • 9e4140329   kbuild: change out-of-tree build ... Browse Code »
    43

    This commit changes the working directory
    where the build process occurs.

    Before this commit, build process occurred under the source
    tree for both in-tree and out-of-tree build.

    That's why we needed to add $(obj) prefix to all generated
    files in makefiles like follows:
    $(obj)u-boot.bin: $(obj)u-boot

    Here, $(obj) is empty for in-tree build, whereas it points
    to the output directory for out-of-tree build.

    And our old build system changes the current working directory
    with "make -C " syntax when descending into the
    sub-directories.

    On the other hand, Kbuild uses a different idea
    to handle out-of-tree build and directory descending.

    The build process of Kbuild always occurs under the output tree.
    When "O=dir/to/store/output/files" is given, the build system
    changes the current working directory to that directory and
    restarts the make.

    Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj="
    syntax for descending into sub-directories.
    (We can write it like "make $(obj)=" with a shorthand.)
    This means the current working directory is always the top
    of the output directory.

    Signed-off-by: Masahiro Yamada
    Tested-by: Gerhard Sittig

    Masahiro Yamada
     
  • bf4b3de10   kbuild: Use Kbuild.include ... Browse Code »

    This commit adjusts some files to use Kbuild.include.

    - Use cc-option defined in Kbuild.include
    (Delete cc-option in config.mk)
    - Use cc-version defined in
    (Delete cc-version in config.mk)
    - Move binutils-version and dtc-version to Kbuild.include
    by analogy to cc-version

    This commit also adds srctree (same as SRCTREE)
    to use Kbuild scripts.

    Signed-off-by: Masahiro Yamada

    Masahiro Yamada
     
  • ceec4c874   kbuild: import Kbuild.include from linux v3.13 tag ... Browse Code »

    Signed-off-by: Masahiro Yamada

    Masahiro Yamada