linux-kernel - Re: [tip:perf/core] perf tools: Fix linking errors with --as-needed flag

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Date:	Mon, 30 Aug 2010 11:38:44 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	acme@...hat.com, tzanussi@...il.com, ozan@...dus.org.tr,
	tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf tools: Fix linking errors with --as-needed
 flag

On Mon, Aug 30, 2010 at 08:35:40AM +0000, tip-bot for Tom Zanussi wrote:
> Commit-ID:  f2481f3df4521e731da36afe7f0fe19a5c93e46d
> Gitweb:     http://git.kernel.org/tip/f2481f3df4521e731da36afe7f0fe19a5c93e46d
> Author:     Tom Zanussi <tzanussi@...il.com>
> AuthorDate: Tue, 24 Aug 2010 00:23:50 -0500
> Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
> CommitDate: Wed, 25 Aug 2010 17:35:21 -0300
> 
> perf tools: Fix linking errors with --as-needed flag
> 
> External shared libraries should never be appended to the LDFLAGS as this
> messes the linking order. As EXTLIBS collects those libraries, it seems that
> perl and python libraries  should also be appended to EXTLIBS.
> 
> Also fix the broken linking order.
> 
> This is a refresh of a patch by Ozan Çağlayan and improved by both Tom Zanussi
> and Kirill A. Shutemov.
> 
> Cc: Ozan Çağlayan <ozan@...dus.org.tr>
> Tested-by: Kirill A. Shutemov <kirill@...temov.name>

I guess Signed-off-by is more appropriate here.

> Tested-by: Tom Zanussi <tzanussi@...il.com>
> LKML-Reference: <1282627430.28324.8.camel@...picana>
> Signed-off-by: Tom Zanussi <tzanussi@...il.com>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/Makefile |   21 +++++++++++++++------
>  1 files changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> index 26a3f2e..fe1e307 100644
> --- a/tools/perf/Makefile
> +++ b/tools/perf/Makefile
> @@ -313,6 +313,9 @@ TEST_PROGRAMS =
>  
>  SCRIPT_SH += perf-archive.sh
>  
> +grep-libs = $(filter -l%,$(1))
> +strip-libs = $(filter-out -l%,$(1))
> +
>  #
>  # No Perl scripts right now:
>  #
> @@ -588,14 +591,17 @@ endif
>  ifdef NO_LIBPERL
>  	BASIC_CFLAGS += -DNO_LIBPERL
>  else
> -	PERL_EMBED_LDOPTS = `perl -MExtUtils::Embed -e ldopts 2>/dev/null`
> +       PERL_EMBED_LDOPTS = $(shell perl -MExtUtils::Embed -e ldopts 2>/dev/null)
> +       PERL_EMBED_LDFLAGS = $(call strip-libs,$(PERL_EMBED_LDOPTS))
> +       PERL_EMBED_LIBADD = $(call grep-libs,$(PERL_EMBED_LDOPTS))
>  	PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
>  	FLAGS_PERL_EMBED=$(PERL_EMBED_CCOPTS) $(PERL_EMBED_LDOPTS)
>  
>  	ifneq ($(call try-cc,$(SOURCE_PERL_EMBED),$(FLAGS_PERL_EMBED)),y)
>  		BASIC_CFLAGS += -DNO_LIBPERL
>  	else
> -		ALL_LDFLAGS += $(PERL_EMBED_LDOPTS)
> +               ALL_LDFLAGS += $(PERL_EMBED_LDFLAGS)
> +               EXTLIBS += $(PERL_EMBED_LIBADD)
>  		LIB_OBJS += $(OUTPUT)util/scripting-engines/trace-event-perl.o
>  		LIB_OBJS += $(OUTPUT)scripts/perl/Perf-Trace-Util/Context.o
>  	endif
> @@ -604,13 +610,16 @@ endif
>  ifdef NO_LIBPYTHON
>  	BASIC_CFLAGS += -DNO_LIBPYTHON
>  else
> -	PYTHON_EMBED_LDOPTS = `python-config --ldflags 2>/dev/null`
> +       PYTHON_EMBED_LDOPTS = $(shell python-config --ldflags 2>/dev/null)
> +       PYTHON_EMBED_LDFLAGS = $(call strip-libs,$(PYTHON_EMBED_LDOPTS))
> +       PYTHON_EMBED_LIBADD = $(call grep-libs,$(PYTHON_EMBED_LDOPTS))
>  	PYTHON_EMBED_CCOPTS = `python-config --cflags 2>/dev/null`
>  	FLAGS_PYTHON_EMBED=$(PYTHON_EMBED_CCOPTS) $(PYTHON_EMBED_LDOPTS)
>  	ifneq ($(call try-cc,$(SOURCE_PYTHON_EMBED),$(FLAGS_PYTHON_EMBED)),y)
>  		BASIC_CFLAGS += -DNO_LIBPYTHON
>  	else
> -		ALL_LDFLAGS += $(PYTHON_EMBED_LDOPTS)
> +               ALL_LDFLAGS += $(PYTHON_EMBED_LDFLAGS)
> +               EXTLIBS += $(PYTHON_EMBED_LIBADD)
>  		LIB_OBJS += $(OUTPUT)util/scripting-engines/trace-event-python.o
>  		LIB_OBJS += $(OUTPUT)scripts/python/Perf-Trace-Util/Context.o
>  	endif
> @@ -919,8 +928,8 @@ $(OUTPUT)perf.o: perf.c $(OUTPUT)common-cmds.h $(OUTPUT)PERF-CFLAGS
>  		$(ALL_CFLAGS) -c $(filter %.c,$^) -o $@
>  
>  $(OUTPUT)perf$X: $(OUTPUT)perf.o $(BUILTIN_OBJS) $(PERFLIBS)
> -	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(OUTPUT)perf.o \
> -		$(BUILTIN_OBJS) $(ALL_LDFLAGS) $(LIBS)
> +	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) $(ALL_LDFLAGS) $(OUTPUT)perf.o \
> +               $(BUILTIN_OBJS) $(LIBS) -o $@
>  
>  $(OUTPUT)builtin-help.o: builtin-help.c $(OUTPUT)common-cmds.h $(OUTPUT)PERF-CFLAGS
>  	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) \

-- 
 Kirill A. Shutemov
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