kbuild: obj-dirs is calculated incorrectly if hostprogs-y is defined

When Makefile.host is included, $(obj-dirs) is subjected to the
addprefix operation for the second time.  Prefix only needs to be added
to the newly added directories, but not to those that came from
Makefile.lib.

This causes the build system to create unneeded empty directories in the
build tree when building in a separate directory.  For instance,
lib/lib/zlib_inflate is created in the build tree.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 2d519704b8f..2b066d12af2 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -33,8 +33,8 @@
 __hostprogs := $(sort $(hostprogs-y)$(hostprogs-m))
 
 # hostprogs-y := tools/build may have been specified. Retreive directory
-obj-dirs += $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
-obj-dirs := $(strip $(sort $(filter-out ./,$(obj-dirs))))
+host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
+host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
 
 
 # C code
@@ -73,7 +73,9 @@ host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
 host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
 host-cshlib	:= $(addprefix $(obj)/,$(host-cshlib))
 host-cshobjs	:= $(addprefix $(obj)/,$(host-cshobjs))
-obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
+host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
+
+obj-dirs += $(host-objdirs)
 
 #####
 # Handle options to gcc. Support building with separate output directory