diff options
| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-07-29 12:15:37 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-08-10 01:32:59 +0900 |
| commit | 85569d19d0f57df5e6cbb918dbddd4f82c0117b5 (patch) | |
| tree | 15329f252c14115c08d7afd9857098eb01aed0cd /scripts | |
| parent | 42640b134bf44e3bac34808e8c39660c7ae42855 (diff) | |
| download | lwn-85569d19d0f57df5e6cbb918dbddd4f82c0117b5.tar.gz lwn-85569d19d0f57df5e6cbb918dbddd4f82c0117b5.zip | |
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/Makefile.host 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 <masahiroy@kernel.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Makefile.build | 5 | ||||
| -rw-r--r-- | scripts/Makefile.host | 10 |
2 files changed, 8 insertions, 7 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index d54adf0dcf39..a467b9323442 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -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/Makefile.host endif # 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/Makefile.host b/scripts/Makefile.host index 687ca3f309e9..278b4d6ac945 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -38,24 +38,22 @@ $(obj)/%.tab.c $(obj)/%.tab.h: $(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))) |