Created attachment 487518 [details] build.log dev-libs/libcss-0.6.1 fails to build against gcc-7.1.0. Switching to gcc-5.4.0 makes the build complete sucessfully. I did not try gcc-6.3.0. src/parse/parse.c: In function ‘parseMalformedAtRule’: src/parse/parse.c:2298:19: error: this statement may fall through [-Werror=implicit-fallthrough=] # emerge --info dev-libs/libcss Portage 2.3.6 (python 3.4.5-final-0, default/linux/amd64/13.0/desktop, gcc-7.1.0, glibc-2.23-r4, 4.12.3-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-4.12.3-gentoo-x86_64-AMD_A12-9800_RADEON_R7,_12_COMPUTE_CORES_4C+8G-with-gentoo-2.3 KiB Mem: 15915960 total, 14589516 free KiB Swap: 16072700 total, 16072700 free Timestamp of repository gentoo: Mon, 31 Jul 2017 13:15:01 +0000 sh bash 4.3_p48-r1 ld GNU ld (Gentoo 2.28 p1.2) 2.28 app-shells/bash: 4.3_p48-r1::gentoo dev-java/java-config: 2.2.0-r3::gentoo dev-lang/perl: 5.24.1-r2::gentoo dev-lang/python: 2.7.12::gentoo, 3.4.5::gentoo dev-util/cmake: 3.7.2::gentoo dev-util/pkgconfig: 0.28-r2::gentoo sys-apps/baselayout: 2.3::gentoo sys-apps/openrc: 0.26.3::gentoo sys-apps/sandbox: 2.10-r3::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69::gentoo sys-devel/automake: 1.15-r2::gentoo sys-devel/binutils: 2.28-r2::gentoo sys-devel/gcc: 5.4.0-r3::gentoo, 7.1.0-r1::gentoo sys-devel/gcc-config: 1.7.3::gentoo sys-devel/libtool: 2.4.6-r3::gentoo sys-devel/make: 4.2.1::gentoo sys-kernel/linux-headers: 4.4::gentoo (virtual/os-headers) sys-libs/glibc: 2.23-r4::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.de.gentoo.org/gentoo-portage/ priority: -1000 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=bdver4" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=bdver4" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="https://ftp.spline.inf.fu-berlin.de/mirrors/gentoo/" LANG="de_DE.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="X a52 aac acl acpi alsa amd64 berkdb bluetooth branding bzip2 cairo cdda cdr cli consolekit cracklib crypt cups cxx dbus dri dts dvd dvdr emboss encode exif fam firefox flac fortran gdbm gif glamor gpm gtk iconv ipv6 java jpeg lcms ldap libnotify mad mng modules mp3 mp4 mpeg multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds qt3support qt5 readline sdl seccomp session spell ssl startup-notification svg tcpd tiff truetype udev udisks unicode upower usb vaapi vorbis webp wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 fma3 fma4 mmx mmxext pclmul popcnt sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 xop" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="libinput" KERNEL="linux" L10N="de en fa vi" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-6" POSTGRES_TARGETS="postgres9_5" PYTHON_SINGLE_TARGET="python3_4" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby21 ruby22" USERLAND="GNU" VIDEO_CARDS="amdgpu radeon radeonsi" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON ================================================================= Package Settings ================================================================= dev-libs/libcss-0.6.1::gentoo was built with the following: USE="-debug -static-libs -test" ABI_X86="(64) -32 (-x32)"
Seems that upstream uses comment /* Fall through */ after the state->substate = Go; to build library. Setting -Werror=implicit-fallthrough= 0 to 3 should help. Probably forcing this cflag in the ebuild could be the solution.
According to gcc documentation, the way to solve this problem is to add __attribute__((fallthrough)); to the switch statement.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2f2c056f0abb7a03325c58ab1b6fa7dc5202f1e8 commit 2f2c056f0abb7a03325c58ab1b6fa7dc5202f1e8 Author: Michael Weber <xmw@gentoo.org> AuthorDate: 2017-12-18 14:33:06 +0000 Commit: Michael Weber <xmw@gentoo.org> CommitDate: 2017-12-18 14:34:06 +0000 dev-libs/libcss: Ignore some gcc diagnostics (upstream is aware of), version bump. Closes: https://bugs.gentoo.org/626754 Closes: https://bugs.gentoo.org/626752 Bug: https://bugs.gentoo.org/636224 Package-Manager: Portage-2.3.19, Repoman-2.3.6 dev-libs/libcss/Manifest | 2 ++ dev-libs/libcss/libcss-0.6.1.ebuild | 9 +++++++++ dev-libs/libcss/libcss-0.7.0.ebuild | 30 ++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+)
