With both gcc and clang on Fedora 25, the build is failing with an assertion failure. This issue started with commit: https://cgit.freedesktop.org/libreoffice/core/commit/?id=8242c22f84cef1bbc8c385875b2da4713b542329 [CUT] xmlsecurity_signing SigningTest::testODFBrokenStreamGPG finished in: 639ms SigningTest::testODFBrokenDsigGPG finished in: 5475ms /core/unotest/source/cpp/macros_test.cxx:52:SigningTest::testODFEncryptedGPG assertion failed - Expression: xComponent.is() - loading failed: file:///core//xmlsecurity/qa/unit/signing/data/encryptedGPG.odt SigningTest::testODFEncryptedGPG finished in: 10168ms macros_test.cxx:52:Assertion Test name: SigningTest::testODFEncryptedGPG assertion failed - Expression: xComponent.is() - loading failed: file:///core//xmlsecurity/qa/unit/signing/data/encryptedGPG.odt Failures !!! Run: 24 Failure total: 1 Failures: 1 Errors: 0 Error: a unit test failed, please do one of: make CppunitTest_xmlsecurity_signing CPPUNITTRACE="gdb --args" # for interactive debugging on Linux ... /core/solenv/gbuild/CppunitTest.mk:114: recipe for target '/core/workdir/CppunitTest/xmlsecurity_signing.test' failed make[1]: *** [/core/workdir/CppunitTest/xmlsecurity_signing.test] Error 1 make[1]: *** Waiting for unfinished jobs.... Makefile:280: recipe for target 'build' failed make: *** [build] Error 2 $clang --version clang version 7.0.0 (trunk 322869) Target: i686-pc-linux-gnu $ gcc --version gcc (GCC) 6.4.1 20170727 (Red Hat 6.4.1-1)