While compiling sys-devel/gdb-8.1 with C*FLAGS="-O3 -ftracer" I got error: x86_64-pc-linux-gnu-g++ -x c++ -O3 -ftracer -pipe -I. -I. -I./../common -I./../regformats -I./.. -I./../../include -I./../gnulib/import -Ibuild-gnulib-gdbserver/import -Wall -Wpointer-ari th -Wno-unused -Wunused-value -Wunused-function -Wno-switch -Wno-char-subscripts -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable -Wno-sign-compare -Wno-narrowing -Wno-error=m aybe-uninitialized -Wformat-nonliteral -DGDBSERVER -c -o fork-inferior.o -MT fork-inferior.o -MMD -MP -MF ./.deps/fork-inferior.Tpo ../nat/fork-inferior.c x86_64-pc-linux-gnu-g++ -x c++ -O3 -ftracer -pipe -I. -I. -I./../common -I./../regformats -I./.. -I./../../include -I./../gnulib/import -Ibuild-gnulib-gdbserver/import -Wall -Wpointer-arith -Wno-unused -Wunused-value -Wunused-function -Wno-switch -Wno-char-subscripts -Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable -Wno-sign-compare -Wno-narrowing -Wno-error=maybe-uninitialized -Wformat-nonliteral -DGDBSERVER -c -o linux-x86-low.o -MT linux-x86-low.o -MMD -MP -MF ./.deps/linux-x86-low.Tpo linux-x86-low.c linux-x86-low.c: Assembler messages: linux-x86-low.c:1947: Error: symbol `start_amd64_void_call_2_a' is already defined linux-x86-low.c:1949: Error: symbol `end_amd64_void_call_2_a' is already defined linux-x86-low.c:1953: Error: symbol `start_amd64_void_call_2_b' is already defined linux-x86-low.c:1954: Error: symbol `end_amd64_void_call_2_b' is already defined linux-x86-low.c:2538: Error: symbol `start_i386_int_call_1_a' is already defined linux-x86-low.c:2540: Error: symbol `end_i386_int_call_1_a' is already defined linux-x86-low.c:2552: Error: symbol `start_i386_int_call_1_c' is already defined linux-x86-low.c:2555: Error: symbol `end_i386_int_call_1_c' is already defined linux-x86-low.c:2566: Error: symbol `start_i386_void_call_2_a' is already defined linux-x86-low.c:2571: Error: symbol `end_i386_void_call_2_a' is already defined linux-x86-low.c:2587: Error: symbol `start_i386_void_call_2_b' is already defined linux-x86-low.c:2590: Error: symbol `end_i386_void_call_2_b' is already defined linux-x86-low.c:2442: Error: symbol `start_i386_reg_a' is already defined linux-x86-low.c:2444: Error: symbol `end_i386_reg_a' is already defined linux-x86-low.c:2451: Error: symbol `start_i386_reg_b' is already defined linux-x86-low.c:2455: Error: symbol `end_i386_reg_b' is already defined linux-x86-low.c:2456: Error: symbol `start_i386_reg_c' is already defined linux-x86-low.c:2459: Error: symbol `end_i386_reg_c' is already defined make[4]: *** [Makefile:580: linux-x86-low.o] Error 1 make[4]: Leaving directory '/var/tmp/portage/sys-devel/gdb-8.1-r1/work/gdb-8.1/gdb/gdbserver' make[3]: *** [Makefile:2022: subdir_do] Error 1 make[3]: Leaving directory '/var/tmp/portage/sys-devel/gdb-8.1-r1/work/gdb-8.1/gdb' make[2]: *** [Makefile:1616: all] Error 2 make[2]: Leaving directory '/var/tmp/portage/sys-devel/gdb-8.1-r1/work/gdb-8.1/gdb' make[1]: *** [Makefile:8157: all-gdb] Error 2 make[1]: Leaving directory '/var/tmp/portage/sys-devel/gdb-8.1-r1/work/gdb-8.1' make: *** [Makefile:850: all] Error 2 This error doesn't appear with -Os or -O2 in C*FLAGS. Reproducible: Always # emerge --info [47/1999] Portage 2.3.40 (python 3.5.5-final-0, default/linux/amd64/17.0/no-multilib/hardened, gcc-7.3.0, glibc-2.26-r7, 4.16.0+ x86_64) ================================================================= System uname: Linux-4.16.0+-x86_64-Intel-R-_Xeon-R-_CPU_X5650_@_2.67GHz-with-gentoo-2.4.1 KiB Mem: 2049752 total, 271788 free KiB Swap: 1441784 total, 958964 free Timestamp of repository gentoo: Mon, 09 Jul 2018 07:30:01 +0000 Head commit of repository gentoo: 65bed03677a5c293108c3b74ff062ba31957cf29 sh bash 4.4_p12 ld GNU ld (Gentoo 2.29.1 p3) 2.29.1 ccache version 3.3.4 [enabled] app-shells/bash: 4.4_p12::gentoo dev-lang/perl: 5.24.3-r1::gentoo dev-lang/python: 2.7.14-r1::gentoo, 3.5.5::gentoo dev-util/ccache: 3.3.4-r1::gentoo dev-util/cmake: 3.9.6::gentoo dev-util/pkgconfig: 0.29.2::gentoo sys-apps/baselayout: 2.4.1-r2::gentoo sys-apps/openrc: 0.34.11::gentoo sys-apps/sandbox: 2.13::gentoo sys-devel/autoconf: 2.69-r4::gentoo sys-devel/automake: 1.15.1-r2::gentoo sys-devel/binutils: 2.29.1-r1::gentoo, 2.30-r2::gentoo sys-devel/gcc: 7.3.0-r3::gentoo sys-devel/gcc-config: 1.8-r1::gentoo sys-devel/libtool: 2.4.6-r3::gentoo sys-devel/make: 4.2.1::gentoo sys-kernel/linux-headers: 4.13::gentoo (virtual/os-headers) sys-libs/glibc: 2.26-r7::gentoo Repositories: gentoo location: /mnt/bcache/slash/usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 sync-rsync-verify-jobs: 1 sync-rsync-extra-opts: sync-rsync-verify-metamanifest: no sync-rsync-verify-max-age: 24 Installed sets: @fail2ban, @www [1/1999] ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O3 -ggdb -march=westmere -mtune=native -ftracer -fuse-ld=gold -fvar-tracking-assignments -fopt-info-optimized -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/php/apache2-php7.1/ext-active/ /etc/php/cgi-php7.1/ext-active/ /etc/php/cli-php7.1/ext-active/ /et c/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O3 -ggdb -march=westmere -mtune=native -ftracer -fuse-ld=gold -fvar-tracking-assignments -fopt-info-optimized -pipe" DISTDIR="/usr/portage/distfiles" ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs ccache collision-protect compressdebug config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync multilib-strict news parallel-fetch parallel -install preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" INSTALL_MASK="/etc/php/fpm-php7.*/fpm.d/www.conf" LANG="pl_PL.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j2 -l 3" 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 --exc lude=/local --exclude=/packages --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="acl amd64 bzip2 caps crypt cxx device-mapper hardened iconv idn iproute2 ipv6 jemalloc libtirpc lto modules nano-syntax ncurses nls nptl openmp pam pcre pgo pie readline seccomp sse sse2 sse3 sse4_1 sse4_2 ssl ssp ssse3 udev unicode xattr xtpax zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hd a-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 a uthn_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= "karbon plan sheets stage words" COLLECTD_PLUGINS="aggregation cgroups conntrack contextswitch cpu curl curl_json df disk dns email entropy ethstat exec filecount hugepages interface iptables irq lvm match_regex mysql netlink load memory network nginx notify_email ntpd openvpn ping postgresql processes protocols redis snmp statsd swap syslog tail tail_csv tcpconns unixsock uptime v mem" CPU_FLAGS_X86="aes sse sse2 sse3 ssse3 sse4_1 sse4_2" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock isync itrax mtk3301 nmea ntrip navcom o ceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="pc" INPUT_DEVICES="libinput keyboard mouse" KERNEL="linux" L10N="en p l" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" NGINX_MODULES_HTTP="access auth_basic brow ser charset dav dav_ext fastcgi gzip headers_more limit_conn limit_req map proxy realip referer rewrite security" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-1" POSTGRES_TARGETS="pos tgres9_5 postgres10" PYTHON_SINGLE_TARGET="python3_5" PYTHON_TARGETS="python2_7 python3_5" RUBY_TARGETS="ruby23" USERLAND="GNU" VIDEO_CARDS="amdgpu fbdev intel nouveau radeon radeonsi vesa dum my v4l" XTABLES_ADDONS="tarpit" Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Thank you for the report. Please recompile and *attach* the logfiles as described on https://wiki.gentoo.org/wiki/Attach_the_logs_to_the_bug_ticket Please reopen this ticket (Status:unconfirmed) afterwards.
Created attachment 539082 [details] build.log
-ftracer is incompatible with some of inline assembly that defines labels as -ftracer duplicates statements as-is. Simplest workaround would be to add 'strip-flags -ftracer' to gdb ebuild. Being a workaround it will not help -fprofile-use users. I wonder if there is a cheap way to make assembly more duplication-friendly or forbid duplication entirely (like marking asm statement volatile).
(In reply to Sergei Trofimovich from comment #3) > -ftracer is incompatible with some of inline assembly that defines labels as > -ftracer duplicates statements as-is. > > Simplest workaround would be to add 'strip-flags -ftracer' to gdb ebuild. > Being a workaround it will not help -fprofile-use users. > > I wonder if there is a cheap way to make assembly more duplication-friendly > or forbid duplication entirely (like marking asm statement volatile). Found it. Duplication cases are explicitly listed in https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html: """ Under certain circumstances, GCC may duplicate (or remove duplicates of) your assembly code when optimizing. This can lead to unexpected duplicate symbol errors during compilation if your asm code defines symbols or labels. Using ‘%=’ (see AssemblerTemplate) may help resolve this problem. ‘%=’ Outputs a number that is unique to each instance of the asm statement in the entire compilation. This option is useful when creating local labels and referring to them multiple times in a single template that generates multiple assembler instructions. """ Unfortunately gdb wants to define labels explicitly and refer them from C code in EMIT_ASM and EMIT_ASM32 macros. I think it would make sense to move label definition out into a top-level definition.
*** Bug 376455 has been marked as a duplicate of this bug. ***
