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SubjectWeird plugin paths in perf and perf.so binaries with 3.14 merge window
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Hi All,

I went to build Linux v3.13-737-g7fe67a1 in Fedora this morning and it
resulted in RPM complaining that the perf and perf.so binaries had
strings in them that matched the RPM_BUILD_ROOT string. That fails
the RPM build.

Looking over the logs, I see that the traceevent plugins are getting a
rather weird -DPLUGIN_DIR define passed to them. E.g.:

gcc -c -g -Wall -I. -I
/home/jwboyer/kernel/kernel-3.13.fc21/linux-3.14.0-0.rc0.git1.1.fc21.x86_64/tools/lib/traceevent/../../include
'-DPLUGIN_DIR="/home/jwboyer/rpmbuild/BUILDROOT/kernel-3.14.0-0.rc0.git1.1.fc21.x86_64//usr//usr/lib64/traceevent/plugins"'
-D_GNU_SOURCE -std=gnu99 -fPIC
/home/jwboyer/kernel/kernel-3.13.fc21/linux-3.14.0-0.rc0.git1.1.fc21.x86_64/tools/lib/traceevent/parse-filter.c
-o parse-filter.o

We're building perf like so:

make -s -j8 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1
HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1
prefix=/usr DESTDIR=/home/jwboyer/rpmbuild/BUILDROOT/kernel-3.14.0-0.rc0.git1.1.fc21.x86_64
all

and installing it via:

make -s -j8 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1
HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1
prefix=/usr DESTDIR=/home/jwboyer/rpmbuild/BUILDROOT/kernel-3.14.0-0.rc0.git1.1.fc21.x86_64
install-bin

make -s -j8 -C tools/perf V=1 WERROR=0 NO_LIBUNWIND=1
HAVE_CPLUS_DEMANGLE=1 NO_GTK2=1 NO_LIBNUMA=1 NO_STRLCPY=1 NO_BIONIC=1
prefix=/usr DESTDIR=/home/jwboyer/rpmbuild/BUILDROOT/kernel-3.14.0-0.rc0.git1.1.fc21.x86_64
install-python_ext

This has worked for all the builds up until this point.

Somehow the perf and perf.so binaries are getting the string being
passed via -DPLUGIN_DIR into them, likely through the libtraceevent.a
link. I'm pretty sure that (1) the string being passed is totally
broken and should be "/usr/lib64/traceevent/plugins" and (2) that I
haven't come close to deciphering how to fix this.

So, could you please look this over and see where the define is
getting messed up?

josh


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