for example, when build app-arch/cpio with CC=clang /usr/bin/debugedit: /var/tmp/portage/app-arch/cpio-2.14/image/bin/gcpio: Unknown DWARF DW_FORM_0x25 which will cause installsources not working. This had been reported in https://sourceware.org/bugzilla/show_bug.cgi?id=28728 , but seems have not been fixed yet? Reproducible: Always
make.conf : http://0x0.st/HOcW.conf summary : clang profile + lto + O3 + native + debug symbols + splitdebug + compressdebug + installsources emerge's build log: http://0x0.st/HOAn.log /usr/bin/debugedit: /var/tmp/portage/x11-libs/libXaw-1.0.15/image/usr/lib64/libXaw7.so.7.0.0: Unknown DWARF DW_FORM_0x25 right now (not) solved by adding -gdwarf-4 -fdebug-default-version=4 as compilation flags for clang.