eposd failed to work because newer GCC optimize better null pointer checks on "this" void clazz::method() { if(!this) { do_something(); } } This bad technique is used in epos. After compilation of package with -fno-delete-null-pointer-checks, everything works again. Affected compiler is at least gcc-6.4.0-r1 It worked with gcc-4.9 and it probably worked with gcc-5.4. clang-5.0.1 is also not affected and does not remove this condition.
It is GCC 6 feature "Value range propagation now assumes that the this pointer in C++ member functions is non-null. This eliminates common null pointer checks but also breaks some non-conforming code-bases (such as Qt-5, Chromium, KDevelop). As a temporary work-around -fno-delete-null-pointer-checks can be used. Wrong code can be identified by using -fsanitize=undefined."[1] [1] https://gcc.gnu.org/gcc-6/changes.html
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e6f97f0a34f9cce8727ec01375dede2840676544 commit e6f97f0a34f9cce8727ec01375dede2840676544 Author: Jan Breuer <jan.breuer@mobatime.cz> AuthorDate: 2018-04-09 09:48:40 +0000 Commit: Aaron Bauman <bman@gentoo.org> CommitDate: 2018-05-24 21:57:46 +0000 app-accessibility/epos: fix running on GCC-6 Bug: https://bugs.gentoo.org/649858 Closes: https://bugs.gentoo.org/649858 Package-Manager: Portage-2.3.24, Repoman-2.3.6 Closes: https://github.com/gentoo/gentoo/pull/7909 app-accessibility/epos/epos-2.5.37-r2.ebuild | 1 + 1 file changed, 1 insertion(+) Additionally, it has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e6f97f0a34f9cce8727ec01375dede2840676544 commit e6f97f0a34f9cce8727ec01375dede2840676544 Author: Jan Breuer <jan.breuer@mobatime.cz> AuthorDate: 2018-04-09 09:48:40 +0000 Commit: Aaron Bauman <bman@gentoo.org> CommitDate: 2018-05-24 21:57:46 +0000 app-accessibility/epos: fix running on GCC-6 Bug: https://bugs.gentoo.org/649858 Closes: https://bugs.gentoo.org/649858 Package-Manager: Portage-2.3.24, Repoman-2.3.6 Closes: https://github.com/gentoo/gentoo/pull/7909 app-accessibility/epos/epos-2.5.37-r2.ebuild | 1 + 1 file changed, 1 insertion(+)
The CXXFLAGS should be appended vice overriding all of them.
