I was compiling OpenFOAM on Gentoo Prefix on RHEL 6.2 and noticed that it is ignoring my system CFLAGS: g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3 -DNoRepository -ftemplate-depth-100 -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/finiteVolume/lnInclude -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/lagrangian/basic/lnInclude -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/lagrangian/dsmc/lnInclude -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/meshTools/lnInclude -IlnInclude -I. -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/OpenFOAM/lnInclude -I/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/src/OSspecific/POSIX/lnInclude -fPIC -Xlinker --add-needed -Xlinker --no-as-needed Make/linux64GccDPOpt/dsmcFoam.o -L/home/stonybrook/gentoo/var/tmp/portage/sci-libs/openfoam-2.1.0/work/OpenFOAM-2.1.0/platforms/linux64GccDPOpt/lib \ Here is my system information: $ emerge --info Portage 2.2.01.20153-prefix (prefix/linux/amd64, gcc-4.6.2, unavailable, 2.6.32-220.el6.x86_64 x86_64) ================================================================= System uname: <censored> Timestamp of tree: Mon, 13 Feb 2012 22:41:41 +0000 ccache version 3.1.4 [disabled] app-shells/bash: 4.2_p20::gentoo_prefix dev-lang/python: 2.7.2-r3::gentoo_prefix dev-util/ccache: 3.1.4::gentoo_prefix dev-util/cmake: 2.8.7-r3::gentoo_prefix dev-util/pkgconfig: 0.26::gentoo_prefix sys-devel/autoconf: 2.68::gentoo_prefix sys-devel/automake: 1.11.1::gentoo_prefix sys-devel/binutils: 2.22::gentoo_prefix sys-devel/gcc: 4.2.4-r01.4::gentoo_prefix, 4.5.3-r1::gentoo_prefix, 4.6.2::gentoo_prefix sys-devel/gcc-config: 1.5-r2::gentoo_prefix sys-devel/libtool: 2.4-r4::gentoo_prefix sys-devel/make: 3.82::gentoo_prefix sys-kernel/linux-headers: 3.2::gentoo_prefix Repositories: gentoo_prefix local_overlay science Installed sets: ACCEPT_KEYWORDS="~amd64-linux" ACCEPT_LICENSE="* -@EULA Intel-SDP" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/portage /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-march=native -O2 -pipe" DISTDIR="/home/stonybrook/gentoo/usr/portage/distfiles" FEATURES="assume-digests binpkg-logs collision-protect distlocks ebuild-locks fixlafiles force-prefix news parallel-fetch parallel-install preserve-libs protect-owned sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-march=native -O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1" MAKEOPTS="-j65" PKGDIR="/home/stonybrook/gentoo/usr/portage/packages" PORTAGE_CONFIGROOT="/home/stonybrook/gentoo/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/home/stonybrook/gentoo/var/tmp" PORTDIR="/home/stonybrook/gentoo/usr/portage" PORTDIR_OVERLAY="/home/stonybrook/gentoo/usr/local/portage /home/stonybrook/gentoo/var/lib/layman/science" SYNC="rsync://rsync.prefix.freens.org/gentoo-portage-prefix" USE="amd64 berkdb bzip2 cli cracklib crypt cxx dri fortran gdbm iconv ipv6 mmx modules mudflap ncurses nls nptl nptlonly openmp pcre pppd prefix readline session sse sse2 ssl sysfs tcpd unicode xorg 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="kexi words flow plan stage tables krita karbon braindump" CAMERAS="ptp2" 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" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga neomagic nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" 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, LC_ALL, LINGUAS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
(JFYI, The fact that it is Gentoo Prefix is not relevant)
I tried compiling openfoam-2.1.1 with gcc-4.7.2 and LTO and found the same results. My build.log has lots of -O3, but no -O2, -pipe, or -flto anywhere.
Confirmed by Benj FitzPatrick.
Package removed.
