1# ========================================================================== 2# Building binaries on the host system 3# Binaries are used during the compilation of the kernel, for example 4# to preprocess a data file. 5# 6# Both C and C++ are supported, but preferred language is C for such utilities. 7# 8# Sample syntax (see Documentation/kbuild/makefiles.txt for reference) 9# hostprogs-y := bin2hex 10# Will compile bin2hex.c and create an executable named bin2hex 11# 12# hostprogs-y := lxdialog 13# lxdialog-objs := checklist.o lxdialog.o 14# Will compile lxdialog.c and checklist.c, and then link the executable 15# lxdialog, based on checklist.o and lxdialog.o 16# 17# hostprogs-y := qconf 18# qconf-cxxobjs := qconf.o 19# qconf-objs := menu.o 20# Will compile qconf as a C++ program, and menu as a C program. 21# They are linked as C++ code to the executable qconf 22# 23# SPDX-License-Identifier: GPL-2.0 24# 25 26__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) 27 28# C code 29# Executables compiled from a single .c file 30host-csingle := $(foreach m,$(__hostprogs), \ 31 $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-sharedobjs),,$(m))) 32 33# C executables linked based on several .o files 34host-cmulti := $(foreach m,$(__hostprogs),\ 35 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 36 37# Shared object libraries 38host-shared := $(foreach m,$(__hostprogs),\ 39 $(if $($(m)-sharedobjs),$(m)))) 40 41# Object (.o) files compiled from .c files 42host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 43 44# C++ code 45# C++ executables compiled from at least one .cc file 46# and zero or more .c files 47host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 48 49# C++ Object (.o) files compiled from .cc files 50host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 51 52# output directory for programs/.o files 53# hostprogs-y := tools/build may have been specified. 54# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 55host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 56 57host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 58 59 60__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 61host-csingle := $(addprefix $(obj)/,$(host-csingle)) 62host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 63host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 64host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 65host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 66host-shared := $(addprefix $(obj)/,$(host-shared)) 67host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 68 69obj-dirs += $(host-objdirs) 70 71##### 72# Handle options to gcc. Support building with separate output directory 73 74_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 75 $(HOSTCFLAGS_$(basetarget).o) 76_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 77 $(HOSTCXXFLAGS_$(basetarget).o) 78 79ifeq ($(KBUILD_SRC),) 80__hostc_flags = $(_hostc_flags) 81__hostcxx_flags = $(_hostcxx_flags) 82else 83__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 84__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 85endif 86 87hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 88hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 89 90##### 91# Compile programs on the host 92 93# Create executable from a single .c file 94# host-csingle -> Executable 95quiet_cmd_host-csingle = HOSTCC $@ 96 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 97 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 98$(host-csingle): $(obj)/%: $(src)/%.c FORCE 99 $(call if_changed_dep,host-csingle) 100 101# Link an executable based on list of .o files, all plain c 102# host-cmulti -> executable 103quiet_cmd_host-cmulti = HOSTLD $@ 104 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 105 $(addprefix $(obj)/,$($(@F)-objs)) \ 106 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 107$(host-cmulti): FORCE 108 $(call if_changed,host-cmulti) 109$(call multi_depend, $(host-cmulti), , -objs) 110 111# Create .o file from a single .c file 112# host-cobjs -> .o 113quiet_cmd_host-cobjs = HOSTCC $@ 114 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 115$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 116 $(call if_changed_dep,host-cobjs) 117 118# Link an executable based on list of .o files, a mixture of .c and .cc 119# host-cxxmulti -> executable 120quiet_cmd_host-cxxmulti = HOSTLD $@ 121 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 122 $(foreach o,objs cxxobjs,\ 123 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 124 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 125$(host-cxxmulti): FORCE 126 $(call if_changed,host-cxxmulti) 127$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 128 129# Create .o file from a single .cc (C++) file 130quiet_cmd_host-cxxobjs = HOSTCXX $@ 131 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 132$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 133 $(call if_changed_dep,host-cxxobjs) 134 135targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 136 $(host-cxxmulti) $(host-cxxobjs) $(host-shared) 137