diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 39 | ||||
| -rw-r--r-- | Makefile | 12 | ||||
| -rw-r--r-- | arch/ia64/Makefile | 2 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 24 | ||||
| -rw-r--r-- | scripts/Kbuild.include | 14 | ||||
| -rw-r--r-- | scripts/Makefile.clean | 4 | ||||
| -rw-r--r-- | scripts/Makefile.extrawarn | 21 | ||||
| -rw-r--r-- | scripts/Makefile.host | 61 |
9 files changed, 75 insertions, 103 deletions
diff --git a/.gitignore b/.gitignore index f4c0b091dcf4..e213b27f3921 100644 --- a/.gitignore +++ b/.gitignore @@ -34,6 +34,7 @@ *.gcno modules.builtin Module.symvers +*.dwo # # Top-level generic files diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index c600e2f44a62..764f5991a3fc 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -23,11 +23,10 @@ This document describes the Linux kernel Makefiles. === 4 Host Program support --- 4.1 Simple Host Program --- 4.2 Composite Host Programs - --- 4.3 Defining shared libraries - --- 4.4 Using C++ for host programs - --- 4.5 Controlling compiler options for host programs - --- 4.6 When host programs are actually built - --- 4.7 Using hostprogs-$(CONFIG_FOO) + --- 4.3 Using C++ for host programs + --- 4.4 Controlling compiler options for host programs + --- 4.5 When host programs are actually built + --- 4.6 Using hostprogs-$(CONFIG_FOO) === 5 Kbuild clean infrastructure @@ -643,29 +642,7 @@ Both possibilities are described in the following. Finally, the two .o files are linked to the executable, lxdialog. Note: The syntax <executable>-y is not permitted for host-programs. ---- 4.3 Defining shared libraries - - Objects with extension .so are considered shared libraries, and - will be compiled as position independent objects. - Kbuild provides support for shared libraries, but the usage - shall be restricted. - In the following example the libkconfig.so shared library is used - to link the executable conf. - - Example: - #scripts/kconfig/Makefile - hostprogs-y := conf - conf-objs := conf.o libkconfig.so - libkconfig-objs := expr.o type.o - - Shared libraries always require a corresponding -objs line, and - in the example above the shared library libkconfig is composed by - the two objects expr.o and type.o. - expr.o and type.o will be built as position independent code and - linked as a shared library libkconfig.so. C++ is not supported for - shared libraries. - ---- 4.4 Using C++ for host programs +--- 4.3 Using C++ for host programs kbuild offers support for host programs written in C++. This was introduced solely to support kconfig, and is not recommended @@ -688,7 +665,7 @@ Both possibilities are described in the following. qconf-cxxobjs := qconf.o qconf-objs := check.o ---- 4.5 Controlling compiler options for host programs +--- 4.4 Controlling compiler options for host programs When compiling host programs, it is possible to set specific flags. The programs will always be compiled utilising $(HOSTCC) passed @@ -716,7 +693,7 @@ Both possibilities are described in the following. When linking qconf, it will be passed the extra option "-L$(QTDIR)/lib". ---- 4.6 When host programs are actually built +--- 4.5 When host programs are actually built Kbuild will only build host-programs when they are referenced as a prerequisite. @@ -747,7 +724,7 @@ Both possibilities are described in the following. This will tell kbuild to build lxdialog even if not referenced in any rule. ---- 4.7 Using hostprogs-$(CONFIG_FOO) +--- 4.6 Using hostprogs-$(CONFIG_FOO) A typical pattern in a Kbuild file looks like this: @@ -372,6 +372,7 @@ GENKSYMS = scripts/genksyms/genksyms INSTALLKERNEL := installkernel DEPMOD = /sbin/depmod PERL = perl +PYTHON = python CHECK = sparse CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ @@ -422,7 +423,7 @@ KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(S export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC export CPP AR NM STRIP OBJCOPY OBJDUMP -export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE +export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS @@ -687,6 +688,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) # source of a reference will be _MergedGlobals and not on of the whitelisted names. # See modpost pattern 2 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) +KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) else # This warning generated too much noise in a regular build. @@ -710,9 +712,16 @@ endif KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) ifdef CONFIG_DEBUG_INFO +ifdef CONFIG_DEBUG_INFO_SPLIT +KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) +else KBUILD_CFLAGS += -g +endif KBUILD_AFLAGS += -Wa,-gdwarf-2 endif +ifdef CONFIG_DEBUG_INFO_DWARF4 +KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) +endif ifdef CONFIG_DEBUG_INFO_REDUCED KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ @@ -1398,6 +1407,7 @@ clean: $(clean-dirs) @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ -o -name '*.ko.*' \ + -o -name '*.dwo' \ -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ -o -name '*.symtypes' -o -name 'modules.order' \ -o -name modules.builtin -o -name '.tmp_*.o.*' \ diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile index f37238f45bcd..5441b14994fc 100644 --- a/arch/ia64/Makefile +++ b/arch/ia64/Makefile @@ -76,7 +76,7 @@ vmlinux.gz: vmlinux $(Q)$(MAKE) $(build)=$(boot) $@ unwcheck: vmlinux - -$(Q)READELF=$(READELF) python $(srctree)/arch/ia64/scripts/unwcheck.py $< + -$(Q)READELF=$(READELF) $(PYTHON) $(srctree)/arch/ia64/scripts/unwcheck.py $< archclean: $(Q)$(MAKE) $(clean)=$(boot) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index cb45f59685e6..07c28323f88f 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -143,6 +143,30 @@ config DEBUG_INFO_REDUCED DEBUG_INFO build and compile times are reduced too. Only works with newer gcc versions. +config DEBUG_INFO_SPLIT + bool "Produce split debuginfo in .dwo files" + depends on DEBUG_INFO + help + Generate debug info into separate .dwo files. This significantly + reduces the build directory size for builds with DEBUG_INFO, + because it stores the information only once on disk in .dwo + files instead of multiple times in object files and executables. + In addition the debug information is also compressed. + + Requires recent gcc (4.7+) and recent gdb/binutils. + Any tool that packages or reads debug information would need + to know about the .dwo files and include them. + Incompatible with older versions of ccache. + +config DEBUG_INFO_DWARF4 + bool "Generate dwarf4 debuginfo" + depends on DEBUG_INFO + help + Generate dwarf4 debug info. This requires recent versions + of gcc and gdb. It makes the debug information larger. + But it significantly improves the success of resolving + variables in gdb on optimized code. + config ENABLE_WARN_DEPRECATED bool "Enable __deprecated logic" default y diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 122f95c95869..8a9a4e1c7eab 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -215,11 +215,13 @@ else arg-check = $(if $(strip $(cmd_$@)),,1) endif -# >'< substitution is for echo to work, -# >$< substitution to preserve $ when reloading .cmd file -# note: when using inline perl scripts [perl -e '...$$t=1;...'] -# in $(cmd_xxx) double $$ your perl vars -make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))) +# Replace >$< with >$$< to preserve $ when reloading the .cmd file +# (needed for make) +# Replace >#< with >\#< to avoid starting a comment in the .cmd file +# (needed for make) +# Replace >'< with >'\''< to be able to enclose the whole string in '...' +# (needed for the shell) +make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1))))) # Find any prerequisites that is newer than target or that does not exist. # PHONY targets skipped in both cases. @@ -230,7 +232,7 @@ any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ @set -e; \ $(echo-cmd) $(cmd_$(1)); \ - echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) + printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean index 686cb0d31c7c..a651cee84f2a 100644 --- a/scripts/Makefile.clean +++ b/scripts/Makefile.clean @@ -40,8 +40,8 @@ subdir-ymn := $(addprefix $(obj)/,$(subdir-ymn)) # build a list of files to remove, usually relative to the current # directory -__clean-files := $(extra-y) $(always) \ - $(targets) $(clean-files) \ +__clean-files := $(extra-y) $(extra-m) $(extra-) \ + $(always) $(targets) $(clean-files) \ $(host-progs) \ $(hostprogs-y) $(hostprogs-m) $(hostprogs-) diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index 65643506c71c..f734033af219 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -26,16 +26,6 @@ warning-1 += $(call cc-option, -Wmissing-include-dirs) warning-1 += $(call cc-option, -Wunused-but-set-variable) warning-1 += $(call cc-disable-warning, missing-field-initializers) -# Clang -warning-1 += $(call cc-disable-warning, initializer-overrides) -warning-1 += $(call cc-disable-warning, unused-value) -warning-1 += $(call cc-disable-warning, format) -warning-1 += $(call cc-disable-warning, unknown-warning-option) -warning-1 += $(call cc-disable-warning, sign-compare) -warning-1 += $(call cc-disable-warning, format-zero-length) -warning-1 += $(call cc-disable-warning, uninitialized) -warning-1 += $(call cc-option, -fcatch-undefined-behavior) - warning-2 := -Waggregate-return warning-2 += -Wcast-align warning-2 += -Wdisabled-optimization @@ -64,4 +54,15 @@ ifeq ("$(strip $(warning))","") endif KBUILD_CFLAGS += $(warning) +else + +ifeq ($(COMPILER),clang) +KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) +KBUILD_CFLAGS += $(call cc-disable-warning, unused-value) +KBUILD_CFLAGS += $(call cc-disable-warning, format) +KBUILD_CFLAGS += $(call cc-disable-warning, unknown-warning-option) +KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) +KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) +KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) +endif endif diff --git a/scripts/Makefile.host b/scripts/Makefile.host index 66893643fd7d..ab5980f91714 100644 --- a/scripts/Makefile.host +++ b/scripts/Makefile.host @@ -20,21 +20,12 @@ # 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 consists of -# expr.o and type.o (they are both compiled as C code and the object files -# 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)) # C code # Executables compiled from a single .c file -host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m))) +host-csingle := $(foreach m,$(__hostprogs), \ + $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) # C executables linked based on several .o files host-cmulti := $(foreach m,$(__hostprogs),\ @@ -44,33 +35,17 @@ host-cmulti := $(foreach m,$(__hostprogs),\ host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) # C++ code -# C++ executables compiled from at least on .cc file +# C++ executables compiled from at least one .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)))) - # output directory for programs/.o files -# hostprogs-y := tools/build may have been specified. Retrieve directory -host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f)))) -# directory of .o files from prog-objs notation -host-objdirs += $(foreach f,$(host-cmulti), \ - $(foreach m,$($(f)-objs), \ - $(if $(dir $(m)),$(dir $(m))))) -# directory of .o files from prog-cxxobjs notation -host-objdirs += $(foreach f,$(host-cxxmulti), \ - $(foreach m,$($(f)-cxxobjs), \ - $(if $(dir $(m)),$(dir $(m))))) +# hostprogs-y := tools/build may have been specified. +# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation +host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) @@ -81,8 +56,6 @@ 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)) host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) obj-dirs += $(host-objdirs) @@ -123,7 +96,7 @@ quiet_cmd_host-cmulti = HOSTLD $@ cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ $(addprefix $(obj)/,$($(@F)-objs)) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) -$(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE +$(host-cmulti): $(obj)/%: $(host-cobjs) FORCE $(call if_changed,host-cmulti) # Create .o file from a single .c file @@ -140,7 +113,7 @@ quiet_cmd_host-cxxmulti = HOSTLD $@ $(foreach o,objs cxxobjs,\ $(addprefix $(obj)/,$($(@F)-$(o)))) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) -$(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE +$(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) FORCE $(call if_changed,host-cxxmulti) # Create .o file from a single .cc (C++) file @@ -149,21 +122,5 @@ quiet_cmd_host-cxxobjs = HOSTCXX $@ $(host-cxxobjs): $(obj)/%.o: $(src)/%.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): $(obj)/%.o: $(src)/%.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): $(obj)/%: $(host-cshobjs) FORCE - $(call if_changed,host-cshlib) - targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ - $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) + $(host-cxxmulti) $(host-cxxobjs) |