Bug 379085 – sys-devel/clang - clang++ with USE=system-cxx-headers mixes headers and libraries from different gcc versions

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Daniel Scharrer 2011-08-13 16:08:54 UTC]

I have multiple gcc versions installed (4.3.4, 4.4.5, 4.5.3, 4.6.1) with 4.5.3 being the default one.

When emerging sys-devel/clang with the system-cxx-headers (default on) use flag, the resulting clang++ binary uses the C++ stl headers from gcc 4.5.3 but tries to link against the libraries from gcc 4.4.5 (including libstdc++)

This can cause programs to fail to compile because of missing symbols.

Reproducible: Always

Steps to Reproduce:
1. Emerge =sys-devel/clang-2.9 with USE=system-cxx-headers
2. Use clang++ to compile a program that uses the erase method from std::list
Actual Results:  
The program fails to compile because of undefined references to std::_List_node_base::_M_unhook()

Expected Results:  
The program compiles successfully

The program compiles fine if clang was emerged without the system-cxx-headers use flag.

It also worked fine with gcc 4.5.2 instead of gcc 4.5.3 (4.5.2 seems to be on clangs list of hardcoded search paths, but 4.5.3 isn't)

[Comment 1 Daniel Scharrer 2011-08-13 16:10:16 UTC]

Created attachment 283207 [details]
Testcase that fails to compile with clang++ compiled with USE=system-cxx-headers

[Comment 2 Daniel Scharrer 2011-08-13 16:11:03 UTC]

Created attachment 283209 [details]
clang++ -v -O0 test.cpp -Wl,--verbose output for clang compiled with USE=system-cxx-headers

[Comment 3 Daniel Scharrer 2011-08-13 16:11:25 UTC]

Created attachment 283211 [details]
clang++ -v -O0 test.cpp -Wl,--verbose output for clang compiled with USE=-system-cxx-headers

[Comment 4 Daniel Scharrer 2011-08-13 16:13:04 UTC]

emerge --info output:

Portage 2.2.0_alpha51 (default/linux/amd64/10.0, gcc-4.5.3, glibc-2.12.2-r0, 2.6.39-gentoo-r1 x86_64)
=================================================================
System uname: Linux-2.6.39-gentoo-r1-x86_64-AMD_Phenom-tm-_9750_Quad-Core_Processor-with-gentoo-2.0.3
Timestamp of tree: Fri, 12 Aug 2011 19:30:01 +0000
ccache version 2.4 [enabled]
app-shells/bash:          4.2_p10
dev-java/java-config:     2.1.11-r3
dev-lang/python:          2.7.1-r1, 3.1.3-r1
dev-util/ccache:          2.4-r9
dev-util/cmake:           2.8.5-r2
dev-util/pkgconfig:       0.26
sys-apps/baselayout:      2.0.3
sys-apps/openrc:          0.8.3-r1
sys-apps/sandbox:         2.5
sys-devel/autoconf:       2.13, 2.68
sys-devel/automake:       1.9.6-r3, 1.11.1-r1
sys-devel/binutils:       2.21.1
sys-devel/gcc:            4.3.4, 4.4.5, 4.5.3, 4.6.1
sys-devel/gcc-config:     1.4.1-r1
sys-devel/libtool:        2.4-r1
sys-devel/make:           3.82
sys-kernel/linux-headers: 2.6.38 (virtual/os-headers)
sys-libs/glibc:           2.12.2
Repositories: gentoo games multimedia zugaina gamerlay-stable kde local-repo
Installed sets: @kdeadmin, @kdeartwork, @kdebase, @kdegraphics, @kdeutils, @system
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe -O2 -march=amdfam10 -ggdb -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/maven-bin-3.0/conf"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-O2 -pipe -O2 -march=amdfam10 -ggdb -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="assume-digests binpkg-logs ccache distlocks ebuild-locks fixlafiles fixpackages news parallel-fetch preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS=""
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="en_US.utf8"
LC_ALL="en_US.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS=" -j5"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/layman/games /var/lib/layman/multimedia /var/lib/layman/zugaina /var/lib/layman/gamerlay /var/lib/layman/kde /usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="3dnow 3dnowext X X11 acl alsa amd64 bash-completion berkdb bzip2 cli consolekit cracklib crypt cups cxx dbus dri fortran gdbm gpm iconv ipv6 j2k jpeg2k kde kde4 lm_sensors mmx mmxext modules mudflap multilib ncurses nls nptl nptlonly openexr opengl openmp pam pch pcre perl png poliicykit pppd python qt qt4 readline sdl semantic-desktop session sse sse2 sse3 ssl ssse3 sysfs tcpd threads truetype udev unicode x11 xgl xorg xv zlib" 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" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="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="braindump flow karbon kexi kpresenter krita tables words" CAMERAS="canon directory ptp2 template" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" SANE_BACKENDS="hp*" USERLAND="GNU" VIDEO_CARDS="radeon" 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:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LINGUAS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

[Comment 5 Bernard Cafarelli 2011-08-16 12:31:04 UTC]

Hi, thanks for the detailed report and testcase!

I cannot check this bug this week, but it may have been fixed in clang-2.9-r1 (from bug #377949). Too bad setting the paths is only halfway-done at the moment (only c++ headers, not crtbegin.o, libgcc, ...), as this mixes hardcoded paths and lookups through a list of candidate paths...

[Comment 6 Daniel Scharrer 2011-08-21 01:03:35 UTC]

sys-devel/clang-2.9-r1 does indeed fix this bug, at least for the testcase and for the programs I tried

[Comment 7 Bernard Cafarelli 2011-08-29 12:33:39 UTC]

Thanks for checking!

So this is "fixed with clang-2.9-r1, even if for now this is still a workaround