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))) 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# Object (.o) files compiled from .c files 38host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 39 40# C++ code 41# C++ executables compiled from at least one .cc file 42# and zero or more .c files 43host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 44 45# C++ Object (.o) files compiled from .cc files 46host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 47 48# output directory for programs/.o files 49# hostprogs-y := tools/build may have been specified. 50# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 51host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 52 53host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 54 55 56__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 57host-csingle := $(addprefix $(obj)/,$(host-csingle)) 58host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 59host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 60host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 61host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 62host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 63 64obj-dirs += $(host-objdirs) 65 66##### 67# Handle options to gcc. Support building with separate output directory 68 69_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 70 $(HOSTCFLAGS_$(basetarget).o) 71_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 72 $(HOSTCXXFLAGS_$(basetarget).o) 73 74ifeq ($(KBUILD_SRC),) 75__hostc_flags = $(_hostc_flags) 76__hostcxx_flags = $(_hostcxx_flags) 77else 78__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 79__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 80endif 81 82hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 83hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 84 85##### 86# Compile programs on the host 87 88# Create executable from a single .c file 89# host-csingle -> Executable 90quiet_cmd_host-csingle = HOSTCC $@ 91 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 92 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 93$(host-csingle): $(obj)/%: $(src)/%.c FORCE 94 $(call if_changed_dep,host-csingle) 95 96# Link an executable based on list of .o files, all plain c 97# host-cmulti -> executable 98quiet_cmd_host-cmulti = HOSTLD $@ 99 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 100 $(addprefix $(obj)/,$($(@F)-objs)) \ 101 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 102$(host-cmulti): FORCE 103 $(call if_changed,host-cmulti) 104$(call multi_depend, $(host-cmulti), , -objs) 105 106# Create .o file from a single .c file 107# host-cobjs -> .o 108quiet_cmd_host-cobjs = HOSTCC $@ 109 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 110$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 111 $(call if_changed_dep,host-cobjs) 112 113# Link an executable based on list of .o files, a mixture of .c and .cc 114# host-cxxmulti -> executable 115quiet_cmd_host-cxxmulti = HOSTLD $@ 116 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 117 $(foreach o,objs cxxobjs,\ 118 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 119 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 120$(host-cxxmulti): FORCE 121 $(call if_changed,host-cxxmulti) 122$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 123 124# Create .o file from a single .cc (C++) file 125quiet_cmd_host-cxxobjs = HOSTCXX $@ 126 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 127$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 128 $(call if_changed_dep,host-cxxobjs) 129 130targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 131 $(host-cxxmulti) $(host-cxxobjs) 132