Bugzilla Bug 199835

lam-mpi-7.1.2 builds fine with --as-needed, but when I try to build an MPI
executable it gives me lots of "undefined reference to <some-symbol>" errors
when linking against /usr/lib/libmpi.so
It works fine if I remove --as-needed from LDFLAGS.

Reproducible: Always

Post the actual errors here, please. Also emerge --info is missing.

Created an attachment (id=136560) [edit]
build log example

# emerge --info
Portage 2.1.3.19 (default-linux/x86/2006.1/desktop, gcc-4.2.2, glibc-2.6.1-r0,
2.6.23-gentoo i686)
=================================================================
System uname: 2.6.23-gentoo i686 Intel(R) Pentium(R) M processor 1500MHz
Timestamp of tree: Tue, 20 Nov 2007 20:30:01 +0000
app-shells/bash:     3.2_p17-r1
dev-java/java-config: 1.3.7, 2.1.2-r1
dev-lang/python:     2.5.1-r3
sys-apps/baselayout: 1.12.10-r5
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.24
virtual/os-headers:  2.6.23-r1
ACCEPT_KEYWORDS="x86 ~x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=pentium-m -pipe -fomit-frame-pointer
-momit-leaf-frame-pointer -fno-ident"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf
/etc/gconf /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c
/etc/udev/rules.d"
CXXFLAGS="-O2 -march=pentium-m -pipe -fomit-frame-pointer
-momit-leaf-frame-pointer -fno-ident -fvisibility-inlines-hidden"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks metadata-transfer sandbox sfperms strict unmerge-orphans
userfetch"
GENTOO_MIRRORS="http://darkstar.ist.utl.pt/pub/gentoo"
LANG="en_US.UTF-8"
LC_ALL="en_US.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--sort-common -Wl,--as-needed"
LINGUAS="en pt pt_PT"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude=/distfiles --exclude=/local --exclude=/packages
--filter=H_**/files/digest-*"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac acpi alsa avahi bash-completion berkdb bitmap-fonts bzip2 cairo
cdr cli cracklib crypt dbus dri dvd dvdr emboss fam firefox gif gnome gstreamer
gtk gtk2 hal iconv isdnlog jpeg kerberos mad midi mmx mp3 mpeg mudflap ncurses
nls nptl nptlonly ogg opengl openmp pcre pdf perl png ppds pppd python
quicktime readline reflection samba sdl session spell spl sse sse2 ssl svg
threads truetype truetype-fonts type1-fonts unicode vorbis win32codecs x86 xml
xorg xv xvid zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106
cmipci emu10k1 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 mulaw multi null plug rate route
share shm softvol" ELIBC="glibc" INPUT_DEVICES="keyboard mouse synaptics"
KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001
mtxorb ncurses text" LINGUAS="en pt pt_PT" USERLAND="GNU" VIDEO_CARDS="nvidia
vesa"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, PORTAGE_COMPRESS,
PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PORTDIR_OVERLAY

Renato,
I just committed a fix for this in lam-mpi-7.1.4, should be on the mirrors
soon.  Hopefully you're still interested, sorry fixing this took so long.

Thanks for the report.