...because external/gpgmepp spawns /usr/bin/gpgconf (and later on /usr/bin/ggp2,
/usr/bin/gpgsm) which all depend on libgpg-error.so.0, so due to CppunitTest's
LD_LIBRARY_PATH will pick up instdir/program/libgpg-error.so.0, which fails due
to

> /usr/bin/gpgconf: symbol lookup error: /data/sbergman/lo-san/core/instdir/program/libgpg-error.so.0: undefined symbol: __asan_option_detect_stack_use_after_return

The easiest fix appears to be, when running sanitizers on Linux, to hack
gpgmepp's _gpgme_io_spawn to set LD_LIBRARY_PATH back to its original state.
(When it was originally unset, it will now be set but null, but that should not
make a difference.)  This requires EXTRA_ENV_VARS to be set earlier in
CppunitTest.mk, so setting LIBO_LD_PATH doesn't use the LD_LIBRARY_PATH value
set in gb_CppunitTest_CPPTESTPRECOMMAND.

The backtrace of the first, originally failing call to _gpgme_io_spawn during
CppunitTest_xmlsecurity_signing:

> #0  0x00007fffe1f354dc in _gpgme_io_spawn (path=0x1 <error: Cannot access memory at address 0x1>, argv=0x7ffff2fbd4e0, flags=0, fd_list=0x9, atfork=0x4e, atforkvalue=0x7ffff2fbd4e0, r_pid=0x7ffff2fbd4e0) at posix-io.c:433
> #1  0x00007fffe1f41971 in read_gpgconf_dirs (pgmname=0x6110002f8e00 "/usr/bin/gpgconf", components=0) at dirinfo.c:206
> #2  0x00007fffe1f3fa29 in get_gpgconf_item (what=12) at dirinfo.c:284
> #3  0x00007fffe1f4073e in _gpgme_get_default_gpg_name () at dirinfo.c:370
> #4  0x00007fffe1e87093 in engine_get_file_name (proto=GPGME_PROTOCOL_OpenPGP) at engine.c:79
> #5  0x00007fffe1e84e89 in gpgme_get_engine_info (info=0x7ffff2a06160) at engine.c:230
> #6  0x00007fffe1e845ef in gpgme_engine_check_version (proto=GPGME_PROTOCOL_OpenPGP) at engine.c:144
> #7  0x00007fffe634e7d9 in GpgME::checkEngine(GpgME::Protocol) (proto=GpgME::OpenPGP) at context.cpp:1610
> #8  0x00007fff8df3fd49 in SecurityEnvironmentGpg::SecurityEnvironmentGpg() (this=0x6060005825c0) at xmlsecurity/source/gpg/SecurityEnvironment.cxx:30
> #9  0x00007fff8df5755e in SEInitializerGpg::createSecurityContext(rtl::OUString const&) (this=0x606000582560) at xmlsecurity/source/gpg/SEInitializer.cxx:45
> #10 0x00007fff8df57bb3 in non-virtual thunk to SEInitializerGpg::createSecurityContext(rtl::OUString const&) () at include/rtl/stringutils.hxx:170
> #11 0x00007fffab66de90 in DocumentSignatureManager::init() (this=0x7ffff2fbb020) at xmlsecurity/source/helper/documentsignaturemanager.cxx:78
> #12 0x00007fffab498504 in DocumentDigitalSignatures::ImplVerifySignatures(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&, com::sun::star::uno::Reference<com::sun::star::io::XInputStream> const&, DocumentSignatureMode) (this=0x6080001aaf20, rxStorage=uno::Reference to (OStorage *) 0x60d0003a4c48, xSignStream=empty uno::Reference, eMode=DocumentSignatureMode::Content) at xmlsecurity/source/component/documentdigitalsignatures.cxx:264
> #13 0x00007fffab497f8b in DocumentDigitalSignatures::verifyDocumentContentSignatures(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&, com::sun::star::uno::Reference<com::sun::star::io::XInputStream> const&) (this=0x6080001aaf20, rxStorage=uno::Reference to (OStorage *) 0x60d0003a4c48, xSignInStream=empty uno::Reference) at xmlsecurity/source/component/documentdigitalsignatures.cxx:127
> #14 0x00007fffab49c35b in non-virtual thunk to DocumentDigitalSignatures::verifyDocumentContentSignatures(com::sun::star::uno::Reference<com::sun::star::embed::XStorage> const&, com::sun::star::uno::Reference<com::sun::star::io::XInputStream> const&) () at include/cppu/unotype.hxx:136
> #15 0x00007fffafc062a3 in SfxObjectShell::ImplAnalyzeSignature(bool, com::sun::star::uno::Reference<com::sun::star::security::XDocumentDigitalSignatures> const&) (this=0x61100021c7c0, bScriptingContent=false, xSigner=empty uno::Reference) at sfx2/source/doc/objserv.cxx:1293
> #16 0x00007fffafc074b1 in SfxObjectShell::ImplGetSignatureState(bool) (this=0x61100021c7c0, bScriptingContent=false) at sfx2/source/doc/objserv.cxx:1322
> #17 0x00007fffafc0383d in SfxObjectShell::GetDocumentSignatureState() (this=0x61100021c7c0) at sfx2/source/doc/objserv.cxx:1485
> #18 0x00007fffafbb323c in SfxObjectShell::CheckForBrokenDocSignatures_Impl() (this=0x61100021c7c0) at sfx2/source/doc/objmisc.cxx:981
> #19 0x00007fffafbb2da4 in SfxObjectShell::CheckSecurityOnLoading_Impl() (this=0x61100021c7c0) at sfx2/source/doc/objmisc.cxx:931
> #20 0x00007fffafbb95cf in SfxObjectShell::FinishedLoading(SfxLoadedFlags) (this=0x61100021c7c0, nFlags=SfxLoadedFlags::ALL) at sfx2/source/doc/objmisc.cxx:1079
> #21 0x00007fff716a9185 in SwDocShell::LoadingFinished() (this=0x61100021c7c0) at sw/source/uibase/app/docsh.cxx:1153
> #22 0x00007fff71759ada in SwDocShell::Load(SfxMedium&) (this=0x61100021c7c0, rMedium=...) at sw/source/uibase/app/docshini.cxx:581
> #23 0x00007fffafc2bd9a in SfxObjectShell::LoadOwnFormat(SfxMedium&) (this=0x61100021c7c0, rMedium=...) at sfx2/source/doc/objstor.cxx:2971
> #24 0x00007fffafc3128c in SfxObjectShell::DoLoad(SfxMedium*) (this=0x61100021c7c0, pMed=0x60300083dac0) at sfx2/source/doc/objstor.cxx:714
> #25 0x00007fffafdd88d8 in SfxBaseModel::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (this=0x6190000fb0b0, seqArguments=uno::Sequence of length 13 = {...}) at sfx2/source/doc/sfxbasemodel.cxx:1788
> #26 0x00007fffb049a98a in (anonymous namespace)::SfxFrameLoader_Impl::load(com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XFrame> const&) (this=0x6060004aaec0, rArgs=uno::Sequence of length 11 = {...}, _rTargetFrame=uno::Reference to ((anonymous namespace)::Frame *) 0x6160000c63f0) at sfx2/source/view/frmload.cxx:693
> #27 0x00007fff82d6a7ee in framework::LoadEnv::impl_loadContent() (this=0x7ffff2fe3040) at framework/source/loadenv/loadenv.cxx:1105
> #28 0x00007fff82d5aa6b in framework::LoadEnv::startLoading() (this=0x7ffff2fe3040) at framework/source/loadenv/loadenv.cxx:374
> #29 0x00007fff82d56633 in framework::LoadEnv::loadComponentFromURL(com::sun::star::uno::Reference<com::sun::star::frame::XComponentLoader> const&, com::sun::star::uno::Reference<com::sun::star::uno::XComponentContext> const&, rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (xLoader=uno::Reference to (framework::Desktop *) 0x6160000153f8, xContext=uno::Reference to (cppu::ComponentContext *) 0x611000002b10, sURL="file:///xmlsecurity/qa/unit/signing/data/goodGPG.odt", sTarget="_default", nFlags=0, lArgs=uno::Sequence of length 2 = {...}) at framework/source/loadenv/loadenv.cxx:160
> #30 0x00007fff82ec93f0 in framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (this=0x616000015380, sURL="file:///xmlsecurity/qa/unit/signing/data/goodGPG.odt", sTargetFrameName="_default", nSearchFlags=0, lArguments=uno::Sequence of length 2 = {...}) at framework/source/services/desktop.cxx:618
> #31 0x00007fff82ec95eb in non-virtual thunk to framework::Desktop::loadComponentFromURL(rtl::OUString const&, rtl::OUString const&, int, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) () at include/rtl/stringutils.hxx:170
> #32 0x00007fffabe3097d in unotest::MacrosTest::loadFromDesktop(rtl::OUString const&, rtl::OUString const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (this=0x60c000035e48, rURL="file:///xmlsecurity/qa/unit/signing/data/goodGPG.odt", rDocService="com.sun.star.text.TextDocument", rExtraArgs=empty uno::Sequence) at unotest/source/cpp/macros_test.cxx:50
> #33 0x00007fffb2ba9d2a in SigningTest::createDoc(rtl::OUString const&) (this=0x60c000035e00, rURL="file:///xmlsecurity/qa/unit/signing/data/goodGPG.odt") at xmlsecurity/qa/unit/signing/signing.cxx:204
> #34 0x00007fffb2bd1532 in SigningTest::testODFGoodGPG() (this=0x60c000035e00) at xmlsecurity/qa/unit/signing/signing.cxx:690
> #35 0x00007fffb2c304fd in std::__invoke_impl<void, void (SigningTest::*&)(), SigningTest*&>(std::__invoke_memfun_deref, void (SigningTest::*&)(), SigningTest*&) (__f=@0x6030001f0480: (void (SigningTest::*)(SigningTest * const)) 0x7fffb2bd0d80 <SigningTest::testODFGoodGPG()>, __t=@0x6030001f0490: 0x60c000035e00) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/bits/invoke.h:73
> #36 0x00007fffb2c300e0 in std::__invoke<void (SigningTest::*&)(), SigningTest*&>(void (SigningTest::*&)(), SigningTest*&) (__fn=@0x6030001f0480: (void (SigningTest::*)(SigningTest * const)) 0x7fffb2bd0d80 <SigningTest::testODFGoodGPG()>, __args=@0x6030001f0490: 0x60c000035e00) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/bits/invoke.h:95
> #37 0x00007fffb2c2ff2f in std::_Bind<void (SigningTest::*(SigningTest*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) (this=0x6030001f0480, __args=...) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/functional:467
> #38 0x00007fffb2c2fb23 in std::_Bind<void (SigningTest::*(SigningTest*))()>::operator()<, void>() (this=0x6030001f0480) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/functional:549
> #39 0x00007fffb2c2e8d1 in std::_Function_handler<void (), std::_Bind<void (SigningTest::*(SigningTest*))()> >::_M_invoke(std::_Any_data const&) (__functor=...) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/bits/std_function.h:316
> #40 0x00007fffb2c30b1c in std::function<void ()>::operator()() const (this=0x608000083660) at /usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/bits/std_function.h:706
> #41 0x00007fffb2c2db41 in CppUnit::TestCaller<SigningTest>::runTest() (this=0x608000083620) at workdir/UnpackedTarball/cppunit/include/cppunit/TestCaller.h:175
> #42 0x00007ffff78fc159 in CppUnit::TestCaseMethodFunctor::operator()() const (this=0x7ffff2e9c0d0) at TestCase.cpp:32
> #43 0x00007fffdc3cc8e3 in (anonymous namespace)::Protector::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (this=0x602000019910, functor=...) at test/source/vclbootstrapprotector.cxx:48
> #44 0x00007ffff78ccf96 in CppUnit::ProtectorChain::ProtectFunctor::operator()() const (this=0x6030002189e0) at ProtectorChain.cpp:20
> #45 0x00007fffe8938ab3 in (anonymous namespace)::Prot::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (this=0x6020000003f0, functor=...) at unotest/source/cpp/unobootstrapprotector/unobootstrapprotector.cxx:89
> #46 0x00007ffff78ccf96 in CppUnit::ProtectorChain::ProtectFunctor::operator()() const (this=0x603000218a10) at ProtectorChain.cpp:20
> #47 0x00007fffebc1e492 in (anonymous namespace)::Prot::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (this=0x602000000250, functor=..., context=...) at unotest/source/cpp/unoexceptionprotector/unoexceptionprotector.cxx:63
> #48 0x00007ffff78ccf96 in CppUnit::ProtectorChain::ProtectFunctor::operator()() const (this=0x603000218a40) at ProtectorChain.cpp:20
> #49 0x00007ffff7863084 in CppUnit::DefaultProtector::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (this=0x602000000150, functor=..., context=...) at DefaultProtector.cpp:15
> #50 0x00007ffff78ccf96 in CppUnit::ProtectorChain::ProtectFunctor::operator()() const (this=0x603000218a70) at ProtectorChain.cpp:20
> #51 0x00007ffff78c68f5 in CppUnit::ProtectorChain::protect(CppUnit::Functor const&, CppUnit::ProtectorContext const&) (this=0x60b000000510, functor=..., context=...) at ProtectorChain.cpp:86
> #52 0x00007ffff795e259 in CppUnit::TestResult::protect(CppUnit::Functor const&, CppUnit::Test*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (this=0x7ffff2f000a0, functor=..., test=0x608000083620, shortDescription="") at TestResult.cpp:182
> #53 0x00007ffff78fa785 in CppUnit::TestCase::run(CppUnit::TestResult*) (this=0x608000083620, result=0x7ffff2f000a0) at TestCase.cpp:91
> #54 0x00007ffff798c2fe in CppUnit::TestRunner::WrappingSuite::run(CppUnit::TestResult*) (this=0x608000081820, result=0x7ffff2f000a0) at TestRunner.cpp:47
> #55 0x00007ffff795ccdf in CppUnit::TestResult::runTest(CppUnit::Test*) (this=0x7ffff2f000a0, test=0x608000081820) at TestResult.cpp:149
> #56 0x00007ffff798d23f in CppUnit::TestRunner::run(CppUnit::TestResult&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (this=0x7ffff2f4db00, controller=..., testPath="") at TestRunner.cpp:96
> #57 0x000000000052e3a9 in (anonymous namespace)::ProtectedFixtureFunctor::run() const (this=0x7ffff2f00350) at sal/cppunittester/cppunittester.cxx:319
> #58 0x000000000052ae38 in sal_main() () at sal/cppunittester/cppunittester.cxx:469
> #59 0x0000000000529e2c in main(int, char**) (argc=23, argv=0x7fffffff2798) at sal/cppunittester/cppunittester.cxx:376

Change-Id: I386a3b316c78344c2449568894c0f03ba39b1bf0
Reviewed-on: https://gerrit.libreoffice.org/46249Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>