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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug sanitizer/55354] [asan] by default, the asan run-time should be linked statically, not dynamically Date: Fri, 23 Nov 2012 08:14:00 -0000 [thread overview] Message-ID: <bug-55354-4-HqtD3A0Wj1@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-55354-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55354 --- Comment #24 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-23 08:13:11 UTC --- When I rebuild libtsan with -fPIE instead of -fPIC in the Makefile, and g++ -shared -Wl,--whole-archive -o libtsanx.so libtsan.a -ldl -lpthread (note that .libs/*.o are still built with -fPIC because libtool overrides those flags and adds its -fPIC at the end), then this link fails with: /usr/bin/ld: libtsan.a(tsan_rtl.o): relocation R_X86_64_TPOFF32 against `_ZN6__tsan22cur_thread_placeholderE' can not be used when making a shared object; recompile with -fPIC libtsan.a(tsan_rtl.o): could not read symbols: Bad value collect2: error: ld returned 1 exit status (obviously, local-exec model would need to patch the insn at dynamic linking time, making the library DT_TEXTREL (not acceptable for SELinux, not allowed for x86_64 at all)). Yes, I see the code generation differences, but the functions are huge anyway, is it really so crucial that you'd want to make another libtsan_pie.a for it? BTW, the tsan that was added to GCC yesterday doesn't have -ftls-model=initial-exec even, so it is even slower. -ftls-model=initial-exec can only be done for *-*-linux* targets btw, I don't think other dynamic linkers support dlopening IE model shared libraries. E.g. libgomp has in its configure.tgt if test $gcc_cv_have_tls = yes ; then case "${target}" in *-*-linux*) XCFLAGS="${XCFLAGS} -ftls-model=initial-exec" ;; esac fi so libsanitizer/configure.tgt would need to add it to say TSAN_CXXFLAGS var that would be substituted by configure. Would be nice if you could check the numerous warnings from tsan build, e.g. it seems the ALWAYS_INLINE macro doesn't include the inline keyword, and you are using it on functions that don't have inline keyword, which gives a warning and if it is inlined, it is by pure luck. Either you should add inline keywords manually, or put inline keyword into ALWAYS_INLINE macro. There are other warnings...
next prev parent reply other threads:[~2012-11-23 8:14 UTC|newest] Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-11-16 17:03 [Bug other/55354] New: " konstantin.s.serebryany at gmail dot com 2012-11-16 17:15 ` [Bug other/55354] " pinskia at gcc dot gnu.org 2012-11-16 17:21 ` dvyukov at google dot com 2012-11-16 17:22 ` jakub at gcc dot gnu.org 2012-11-16 20:28 ` konstantin.s.serebryany at gmail dot com 2012-11-16 20:47 ` jakub at gcc dot gnu.org 2012-11-16 20:54 ` konstantin.s.serebryany at gmail dot com 2012-11-17 20:36 ` hjl.tools at gmail dot com 2012-11-17 21:08 ` markus at trippelsdorf dot de 2012-11-18 19:36 ` konstantin.s.serebryany at gmail dot com 2012-11-18 19:54 ` jakub at gcc dot gnu.org 2012-11-18 19:59 ` konstantin.s.serebryany at gmail dot com 2012-11-18 20:10 ` jakub at gcc dot gnu.org 2012-11-19 4:13 ` konstantin.s.serebryany at gmail dot com 2012-11-19 8:55 ` jakub at gcc dot gnu.org 2012-11-19 9:03 ` konstantin.s.serebryany at gmail dot com 2012-11-19 9:06 ` konstantin.s.serebryany at gmail dot com 2012-11-19 10:53 ` dvyukov at google dot com 2012-11-21 7:45 ` dvyukov at google dot com 2012-11-21 8:43 ` jakub at gcc dot gnu.org 2012-11-21 9:06 ` dvyukov at google dot com 2012-11-21 9:26 ` jakub at gcc dot gnu.org 2012-11-23 7:17 ` [Bug sanitizer/55354] " dvyukov at google dot com 2012-11-23 7:28 ` dvyukov at google dot com 2012-11-23 8:14 ` jakub at gcc dot gnu.org [this message] 2012-11-23 8:22 ` jakub at gcc dot gnu.org 2012-11-23 8:36 ` dvyukov at google dot com 2012-11-23 10:47 ` konstantin.s.serebryany at gmail dot com 2012-11-23 11:16 ` konstantin.s.serebryany at gmail dot com
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