perf tools: allow cross compiling with DWARF support
in [Kernel]
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From: Masami Hiramatsu on 25 Jun 2010 07:20 Jamie Iles wrote: > The path to elfutils was previously hardcoded as /usr/include/elfutils > which does not work with cross compilers. If CROSS_COMPILE is set, try > to set an include path from GCC's sysroot if GCC was built with sysroot > support, if sysroot support isn't enabled, don't specify a path for > elfutils allowing the user to set it with EXTRA_CFLAGS. Hmm, I'm not so sure about cross compiling. I just thought if there is no sysroot support, we should warn user instead of just failing to find elfutils. Thank you, > > Signed-off-by: Jamie Iles <jamie.iles(a)picochip.com> > Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl> > --- > tools/perf/Makefile | 14 ++++++++++++-- > 1 files changed, 12 insertions(+), 2 deletions(-) > > diff --git a/tools/perf/Makefile b/tools/perf/Makefile > index 6aa2fe3..6217839 100644 > --- a/tools/perf/Makefile > +++ b/tools/perf/Makefile > @@ -503,8 +503,18 @@ PERFLIBS = $(LIB_FILE) > -include config.mak.autogen > -include config.mak > > +ifndef CROSS_COMPILE > +ELFUTILS_INCLUDE = -I/usr/include/elfutils > +else > +# See if the compiler has been built with sysroot support > +SYSROOT_PATH = $(shell $(CC) -print-sysroot 2> /dev/null || echo "") > +ifneq ($(SYSROOT_PATH),) > +ELFUTILS_INCLUDE := -I$(SYSROOT_PATH)/usr/include/elfutils > +endif > +endif > + > ifndef NO_DWARF > -FLAGS_DWARF=$(ALL_CFLAGS) -I/usr/include/elfutils -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) > +FLAGS_DWARF=$(ALL_CFLAGS) $(ELFUTILS_INCLUDE) -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) > ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y) > msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); > NO_DWARF := 1 > @@ -551,7 +561,7 @@ ifndef NO_DWARF > ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined) > msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled); > else > - BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT > + BASIC_CFLAGS += $(ELFUTILS_INCLUDE) -DDWARF_SUPPORT > EXTLIBS += -lelf -ldw > LIB_OBJS += $(OUTPUT)util/probe-finder.o > endif # PERF_HAVE_DWARF_REGS -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Jamie Iles on 25 Jun 2010 07:50 On Fri, Jun 25, 2010 at 08:16:55PM +0900, Masami Hiramatsu wrote: > Jamie Iles wrote: > > The path to elfutils was previously hardcoded as /usr/include/elfutils > > which does not work with cross compilers. If CROSS_COMPILE is set, try > > to set an include path from GCC's sysroot if GCC was built with sysroot > > support, if sysroot support isn't enabled, don't specify a path for > > elfutils allowing the user to set it with EXTRA_CFLAGS. > > Hmm, I'm not so sure about cross compiling. I just thought > if there is no sysroot support, we should warn user instead of > just failing to find elfutils. Is that something that you really need to warn the user about? If they have a compiler without sysroot support they can still cross compile using EXTRA_CFLAGS and the warning would be needless. There isn't a real requirement for sysroot here, just a path to the elfutils headers. Jamie -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Masami Hiramatsu on 25 Jun 2010 08:10 Jamie Iles wrote: > On Fri, Jun 25, 2010 at 08:16:55PM +0900, Masami Hiramatsu wrote: >> Jamie Iles wrote: >>> The path to elfutils was previously hardcoded as /usr/include/elfutils >>> which does not work with cross compilers. If CROSS_COMPILE is set, try >>> to set an include path from GCC's sysroot if GCC was built with sysroot >>> support, if sysroot support isn't enabled, don't specify a path for >>> elfutils allowing the user to set it with EXTRA_CFLAGS. >> Hmm, I'm not so sure about cross compiling. I just thought >> if there is no sysroot support, we should warn user instead of >> just failing to find elfutils. > Is that something that you really need to warn the user about? If they have a > compiler without sysroot support they can still cross compile using > EXTRA_CFLAGS and the warning would be needless. There isn't a real requirement > for sysroot here, just a path to the elfutils headers. It seems that $ELFUTILS_INCLUDE become "" without sysroot support. In that case, I guess that user have to set the elfutils header path to EXTRA_CFLAGS and, make will just show "No libdw.h found or old libdw.h found ..." message. (I just guess, not so familier with cross compile...) So, I just like to suggest adding a message like as; "No sysroot support. Please set elfutils include path in EXTRA_CFLAGS." Doesn't it make easier to find a problem? Other parts are OK for me. Thank you, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Jamie Iles on 25 Jun 2010 09:40 On 06/25/2010 01:03 PM, Masami Hiramatsu wrote: > Jamie Iles wrote: >> On Fri, Jun 25, 2010 at 08:16:55PM +0900, Masami Hiramatsu wrote: >>> Jamie Iles wrote: >>>> The path to elfutils was previously hardcoded as /usr/include/elfutils >>>> which does not work with cross compilers. If CROSS_COMPILE is set, try >>>> to set an include path from GCC's sysroot if GCC was built with sysroot >>>> support, if sysroot support isn't enabled, don't specify a path for >>>> elfutils allowing the user to set it with EXTRA_CFLAGS. [...] > > It seems that $ELFUTILS_INCLUDE become "" without sysroot support. > In that case, I guess that user have to set the elfutils header > path to EXTRA_CFLAGS and, make will just show "No libdw.h found > or old libdw.h found ..." message. (I just guess, not so familier > with cross compile...) > > So, I just like to suggest adding a message like as; > "No sysroot support. Please set elfutils include path in EXTRA_CFLAGS." > Doesn't it make easier to find a problem? > > Other parts are OK for me. Ok, how about this revised patch? From: Jamie Iles <jamie.iles(a)picochip.com> Date: Fri, 25 Jun 2010 13:59:44 +0100 Subject: [PATCHv2] perf tools: allow cross compiling with DWARF support The path to elfutils was previously hardcoded as /usr/include/elfutils which does not work with cross compilers. If CROSS_COMPILE is set, try to set an include path from GCC's sysroot if GCC was built with sysroot support, if sysroot support isn't enabled, don't specify a path for elfutils allowing the user to set it with EXTRA_CFLAGS. v2: if we can't find libdw.h and there is no sysroot support but it would be useful, warn the user. Signed-off-by: Jamie Iles <jamie.iles(a)picochip.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt(a)hitachi.com> Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl> --- tools/perf/Makefile | 19 +++++++++++++++++-- 1 files changed, 17 insertions(+), 2 deletions(-) diff --git a/tools/perf/Makefile b/tools/perf/Makefile index 6aa2fe3..1c08b7b 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -503,9 +503,24 @@ PERFLIBS = $(LIB_FILE) -include config.mak.autogen -include config.mak +ifndef CROSS_COMPILE + ELFUTILS_INCLUDE = -I/usr/include/elfutils +else + # See if the compiler has been built with sysroot support + SYSROOT_PATH = $(shell $(CC) -print-sysroot 2> /dev/null || echo "") + ifneq ($(SYSROOT_PATH),) + ELFUTILS_INCLUDE := -I$(SYSROOT_PATH)/usr/include/elfutils + else + NO_SYSROOT := y + endif +endif + ifndef NO_DWARF -FLAGS_DWARF=$(ALL_CFLAGS) -I/usr/include/elfutils -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) +FLAGS_DWARF=$(ALL_CFLAGS) $(ELFUTILS_INCLUDE) -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y) + ifdef NO_SYSROOT + msg := $(warning No sysroot support. Set elfutils include path in EXTRA_CFLAGS for dwarf support) + endif msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); NO_DWARF := 1 endif # Dwarf support @@ -551,7 +566,7 @@ ifndef NO_DWARF ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined) msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled); else - BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT + BASIC_CFLAGS += $(ELFUTILS_INCLUDE) -DDWARF_SUPPORT EXTLIBS += -lelf -ldw LIB_OBJS += $(OUTPUT)util/probe-finder.o endif # PERF_HAVE_DWARF_REGS -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Masami Hiramatsu on 27 Jun 2010 21:40 Jamie Iles wrote: > On 06/25/2010 01:03 PM, Masami Hiramatsu wrote: >> Jamie Iles wrote: >>> On Fri, Jun 25, 2010 at 08:16:55PM +0900, Masami Hiramatsu wrote: >>>> Jamie Iles wrote: >>>>> The path to elfutils was previously hardcoded as /usr/include/elfutils >>>>> which does not work with cross compilers. If CROSS_COMPILE is set, try >>>>> to set an include path from GCC's sysroot if GCC was built with sysroot >>>>> support, if sysroot support isn't enabled, don't specify a path for >>>>> elfutils allowing the user to set it with EXTRA_CFLAGS. > [...] >> It seems that $ELFUTILS_INCLUDE become "" without sysroot support. >> In that case, I guess that user have to set the elfutils header >> path to EXTRA_CFLAGS and, make will just show "No libdw.h found >> or old libdw.h found ..." message. (I just guess, not so familier >> with cross compile...) >> >> So, I just like to suggest adding a message like as; >> "No sysroot support. Please set elfutils include path in EXTRA_CFLAGS." >> Doesn't it make easier to find a problem? >> >> Other parts are OK for me. > > Ok, how about this revised patch? > > From: Jamie Iles <jamie.iles(a)picochip.com> > Date: Fri, 25 Jun 2010 13:59:44 +0100 > Subject: [PATCHv2] perf tools: allow cross compiling with DWARF support > > The path to elfutils was previously hardcoded as /usr/include/elfutils > which does not work with cross compilers. If CROSS_COMPILE is set, try > to set an include path from GCC's sysroot if GCC was built with sysroot > support, if sysroot support isn't enabled, don't specify a path for > elfutils allowing the user to set it with EXTRA_CFLAGS. > > v2: if we can't find libdw.h and there is no sysroot support but it > would be useful, warn the user. Nice! Looks good to me. :) Acked-by: Masami Hiramatsu <masami.hiramatsu.pt(a)hitachi.com> Thanks! > > Signed-off-by: Jamie Iles <jamie.iles(a)picochip.com> > Cc: Masami Hiramatsu <masami.hiramatsu.pt(a)hitachi.com> > Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl> > --- > tools/perf/Makefile | 19 +++++++++++++++++-- > 1 files changed, 17 insertions(+), 2 deletions(-) > > diff --git a/tools/perf/Makefile b/tools/perf/Makefile > index 6aa2fe3..1c08b7b 100644 > --- a/tools/perf/Makefile > +++ b/tools/perf/Makefile > @@ -503,9 +503,24 @@ PERFLIBS = $(LIB_FILE) > -include config.mak.autogen > -include config.mak > > +ifndef CROSS_COMPILE > + ELFUTILS_INCLUDE = -I/usr/include/elfutils > +else > + # See if the compiler has been built with sysroot support > + SYSROOT_PATH = $(shell $(CC) -print-sysroot 2> /dev/null || echo "") > + ifneq ($(SYSROOT_PATH),) > + ELFUTILS_INCLUDE := -I$(SYSROOT_PATH)/usr/include/elfutils > + else > + NO_SYSROOT := y > + endif > +endif > + > ifndef NO_DWARF > -FLAGS_DWARF=$(ALL_CFLAGS) -I/usr/include/elfutils -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) > +FLAGS_DWARF=$(ALL_CFLAGS) $(ELFUTILS_INCLUDE) -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) > ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y) > + ifdef NO_SYSROOT > + msg := $(warning No sysroot support. Set elfutils include path in EXTRA_CFLAGS for dwarf support) > + endif > msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); > NO_DWARF := 1 > endif # Dwarf support > @@ -551,7 +566,7 @@ ifndef NO_DWARF > ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined) > msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled); > else > - BASIC_CFLAGS += -I/usr/include/elfutils -DDWARF_SUPPORT > + BASIC_CFLAGS += $(ELFUTILS_INCLUDE) -DDWARF_SUPPORT > EXTLIBS += -lelf -ldw > LIB_OBJS += $(OUTPUT)util/probe-finder.o > endif # PERF_HAVE_DWARF_REGS -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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