• Michael Ellerman's avatar
    powerpc/boot: Fix build failures with -j 1 · e41b93a6
    Michael Ellerman authored
    In commit 5e9dcb61 ("powerpc/boot: Expose Kconfig symbols to
    wrapper") we added a dependency to serial.c on autoconf.h:
    
      $(obj)/serial.c: $(obj)/autoconf.h
    
    This works when building in-tree (ie. with KBUILD_OUTPUT unset)
    because the obj tree is the src tree.
    
    But when building with eg. O=build and -j 1 the build fails:
    
      gcc ... -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o arch/powerpc/boot/serial.c
      gcc: error: arch/powerpc/boot/serial.c: No such file or directory
    
    Why this is only happening with -j 1 is not clear, when building with
    -j greater than 1 somehow we decide to look for serial.c in the src
    tree (../), eg:
    
      gcc -I../arch/powerpc/boot -c -o arch/powerpc/boot/serial.o ../arch/powerpc/boot/serial.c
    
    Regardless we shouldn't be specifying a dependency on serial.c in the
    build tree, we want to add a dependency to the version in $(srctree)
    so fix the rule to say that.
    
    Fixes: 5e9dcb61 ("powerpc/boot: Expose Kconfig symbols to wrapper")
    Tested-by: default avatarDaniel Axtens <dja@axtens.net>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    e41b93a6
Makefile 19 KB