build system overhaul

1 files changed, 156 insertions, 0 deletions

diff --git a/scripts/Makefile.host b/scripts/Makefile.host
new file mode 100644
index 000000000..2d519704b
--- /dev/null
+++ b/scripts/Makefile.host
@@ -0,0 +1,156 @@
+# ==========================================================================
+# Building binaries on the host system
+# Binaries are used during the compilation of the kernel, for example
+# to preprocess a data file.
+#
+# Both C and C++ is supported, but preferred language is C for such utilities.
+#
+# Samle syntax (see Documentation/kbuild/makefile.txt for reference)
+# hostprogs-y := bin2hex
+# Will compile bin2hex.c and create an executable named bin2hex
+#
+# hostprogs-y    := lxdialog
+# lxdialog-objs := checklist.o lxdialog.o
+# Will compile lxdialog.c and checklist.c, and then link the executable
+# lxdialog, based on checklist.o and lxdialog.o
+#
+# hostprogs-y      := qconf
+# qconf-cxxobjs   := qconf.o
+# qconf-objs      := menu.o
+# Will compile qconf as a C++ program, and menu as a C program.
+# They are linked as C++ code to the executable qconf
+
+# hostprogs-y := conf
+# conf-objs  := conf.o libkconfig.so
+# libkconfig-objs := expr.o type.o
+# Will create a shared library named libkconfig.so that consist of
+# expr.o and type.o (they are both compiled as C code and the object file
+# are made as position independent code).
+# conf.c is compiled as a c program, and conf.o is linked together with
+# libkconfig.so as the executable conf.
+# Note: Shared libraries consisting of C++ files are not supported
+
+__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))))
+
+
+# C code
+# Executables compiled from a single .c file
+host-csingle    := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
+
+# C executables linked based on several .o files
+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)))
+
+# C++ code
+# C++ executables compiled from at least on .cc file
+# and zero or more .c files
+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)))
+
+# Shared libaries (only .c supported)
+# Shared libraries (.so) - all .so files referenced in "xxx-objs"
+host-cshlib     := $(sort $(filter %.so, $(host-cobjs)))
+# Remove .so files from "xxx-objs"
+host-cobjs      := $(filter-out %.so,$(host-cobjs))
+
+#Object (.o) files used by the shared libaries
+host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
+
+__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
+host-csingle    := $(addprefix $(obj)/,$(host-csingle))
+host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
+host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
+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))
+
+#####
+# Handle options to gcc. Support building with separate output directory
+
+_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   $(HOSTCFLAGS_$(*F).o)
+_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
+
+ifeq ($(KBUILD_SRC),)
+__hostc_flags   = $(_hostc_flags)
+__hostcxx_flags = $(_hostcxx_flags)
+else
+__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
+__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
+endif
+
+hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
+hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
+
+#####
+# Compile programs on the host
+
+# Create executable from a single .c file
+# host-csingle -> Executable
+quiet_cmd_host-csingle  = HOSTCC  $@
+      cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
+                $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-csingle): %: %.c FORCE
+        $(call if_changed_dep,host-csingle)
+
+# Link an executable based on list of .o files, all plain c
+# host-cmulti -> executable
+quiet_cmd_host-cmulti   = HOSTLD  $@
+      cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
+                          $(addprefix $(obj)/,$($(@F)-objs)) \
+                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
+        $(call if_changed,host-cmulti)
+
+# Create .o file from a single .c file
+# host-cobjs -> .o
+quiet_cmd_host-cobjs    = HOSTCC  $@
+      cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
+$(host-cobjs): %.o: %.c FORCE
+        $(call if_changed_dep,host-cobjs)
+
+# Link an executable based on list of .o files, a mixture of .c and .cc
+# host-cxxmulti -> executable
+quiet_cmd_host-cxxmulti = HOSTLD  $@
+      cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
+                          $(foreach o,objs cxxobjs,\
+                          $(addprefix $(obj)/,$($(@F)-$(o)))) \
+                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
+        $(call if_changed,host-cxxmulti)
+
+# Create .o file from a single .cc (C++) file
+quiet_cmd_host-cxxobjs  = HOSTCXX $@
+      cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
+$(host-cxxobjs): %.o: %.cc FORCE
+        $(call if_changed_dep,host-cxxobjs)
+
+# Compile .c file, create position independent .o file
+# host-cshobjs -> .o
+quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
+      cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
+$(host-cshobjs): %.o: %.c FORCE
+        $(call if_changed_dep,host-cshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cshlib)
+quiet_cmd_host-cshlib   = HOSTLLD -shared $@
+      cmd_host-cshlib   = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
+                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cshlib): %: $(host-cshobjs) FORCE
+        $(call if_changed,host-cshlib)
+
+targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
+           $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) 
+