diff options
authorMasahiro Yamada <>2020-07-29 12:15:37 +0900
committerMasahiro Yamada <>2020-08-10 01:32:59 +0900
commit85569d19d0f57df5e6cbb918dbddd4f82c0117b5 (patch)
parent42640b134bf44e3bac34808e8c39660c7ae42855 (diff)
kbuild: sort hostprogs before passing it to ifneq
The conditional: ifneq ($(hostprogs),) ... is evaluated to true if $(hostprogs) does not contain any word but whitespace characters. ifneq ($(strip $(hostprogs)),) ... is a safe way to avoid interpreting whitespace as a non-empty value, but I'd rather want to use the side-effect of $(sort ...) to do the equivalent. $(sort ...) is used in scripts/ in order to drop duplication in $(hostprogs). It is also useful to strip excessive spaces. Move $(sort ...) before evaluating the ifneq. Signed-off-by: Masahiro Yamada <>
2 files changed, 8 insertions, 7 deletions
diff --git a/scripts/ b/scripts/
index d54adf0dcf39..a467b9323442 100644
--- a/scripts/
+++ b/scripts/
@@ -45,12 +45,15 @@ include $(kbuild-file)
include scripts/Makefile.lib
-# Do not include hostprogs rules unless needed
+# Do not include hostprogs rules unless needed.
+# $(sort ...) is used here to remove duplicated words and excessive spaces.
+hostprogs := $(sort $(hostprogs))
ifneq ($(hostprogs),)
include scripts/
# Do not include userprogs rules unless needed.
+# $(sort ...) is used here to remove duplicated words and excessive spaces.
userprogs := $(sort $(userprogs))
ifneq ($(userprogs),)
include scripts/Makefile.userprogs
diff --git a/scripts/ b/scripts/
index 687ca3f309e9..278b4d6ac945 100644
--- a/scripts/
+++ b/scripts/
@@ -38,24 +38,22 @@ $(obj)/ $(obj)/ $(src)/%.y FORCE
# Will compile qconf as a C++ program, and menu as a C program.
# They are linked as C++ code to the executable qconf
-__hostprogs := $(sort $(hostprogs))
# C code
# Executables compiled from a single .c file
-host-csingle := $(foreach m,$(__hostprogs), \
+host-csingle := $(foreach m,$(hostprogs), \
$(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
# C executables linked based on several .o files
-host-cmulti := $(foreach m,$(__hostprogs),\
+host-cmulti := $(foreach m,$(hostprogs),\
$(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
# Object (.o) files compiled from .c files
-host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
+host-cobjs := $(sort $(foreach m,$(hostprogs),$($(m)-objs)))
# C++ code
# C++ executables compiled from at least one .cc file
# and zero or more .c files
-host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
+host-cxxmulti := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m)))
# C++ Object (.o) files compiled from .cc files
host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))