From: Jan Engelhardt on

On Monday 2010-02-22 14:47, Ingo Molnar wrote:
>> >> tools/perf: libraries must come after objects
>> >>
>> >> Link order matters, especially now since distributions are
>> >> using -Wl,--as-needed.

>> >> tools/perf/Makefile | 16 ++++++++--------
>> >> 1 files changed, 8 insertions(+), 8 deletions(-)
>> >
>> >FYI, this patch doesnt apply to the latest version of perf:
>> >

Seems like it was already merged - half of it.

There is this perl linking error now remaining, because
libperf.a comes after the perl part, and I am not sure
how to fix cleanly that Makefile without making more
mess of it.

$ make CC=gcc-4.4
gcc-4.4 -ggdb3 -Wall -Wextra -std=gnu99 -Werror -O6 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Wformat-y2k -Wshadow -Winit-self -Wpacked -Wredundant-decls -Wstack-protector -Wstrict-aliasing=3 -Wswitch-default -Wswitch-enum -Wno-system-headers -Wundef -Wvolatile-register-var -Wwrite-strings -Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wstrict-prototypes -Wdeclaration-after-statement -fstack-protector-all -Iutil/include -I/usr/include/libdwarf -DSHA1_HEADER='<openssl/sha.h>' -o perf perf.o \
builtin-annotate.o builtin-bench.o bench/sched-messaging.o bench/sched-pipe.o bench/mem-memcpy.o builtin-diff.o builtin-help.o builtin-sched.o builtin-buildid-list.o builtin-buildid-cache.o builtin-list.o builtin-record.o builtin-report.o builtin-stat.o builtin-timechart.o builtin-top.o builtin-trace.o builtin-probe.o builtin-kmem.o builtin-lock.o `perl -MExtUtils::Embed -e ldopts 2>/dev/null` libperf.a -lpthread -lrt -lelf -lm -lelf -ldwarf -lbfd -liberty -lz
libperf.a(trace-event-perl.o): In function `define_flag_value':
/home/jengelh/code/linux/tools/perf/util/trace-event-perl.c:125: undefined reference to `Perl_push_scope'
/home/jengelh/code/linux/tools/perf/Context.c:54: undefined reference to `Perl_croak_nocontext'
collect2: ld returned 1 exit status
make: *** [perf] Error 1

$ perl -MExtUtils::Embed -e ldopts
-L/usr/lib/perl5/5.10.0/x86_64-linux-thread-multi/CORE -lperl -lm
-ldl -lcrypt -lpthread
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