Bugzilla Bug 126779

On my system, I found that compiling yacas with -fomit-frame-pointer breaks
error handling within yacas.

First, yacas failed to work at all.  Running it would cause it to terminate
with:
terminate called after throwing an instance of 'int'

I ltrace'd it and found it to be caused by a failed dlopen(), looking for
libmath.  Executing with the following commandline would work:
LD_LIBRARY_PATH=/usr/lib/yacas yacas

But the error should never have happened in the first place, because any errors
attempting to load libmath are supposed to be caught in
/usr/share/yacas/yacasinit.ys:

If(Equals(LoadPlugIns,False),
  [
    Use("base.rep/math.ys");
  ],
  [
    TrapError(DllLoad("libmath"),Use("base.rep/math.ys"));
  ]
  );

After getting yacas to run with LD_LIBRARY_PATH as above, I found that it fails
on any invalid command.  Example:

In> This is not a valid command.
terminate called after throwing an instance of 'int'

Recompiling without -fomit-frame-pointer made the above problems go away:

In> This is not a valid command.
String(1) : Error parsing expression, near token is

It seems -fomit-frame-pointer breaks yacas' internal error handling.  Please
consider filtering it in the ebuild.

Hi Rohan,

Thanks for your report. Unfortunately, I can not reproduce it
since yacas works just fine compiled with -fomit-frame-pointer
on my box. Your issues with dlopen are strange but hard to
debug for me at the moment. If you still have these
issues please post your emerge --info.

best,
Markus

I did some more experimenting, and it seems that the combination of "-Os
-fomit-frame-pointer" is what causes the problem.  Sorry for not attaching
'emerge --info' the first time around, it did not occur to me that it could be
a combination of two or more flags.

The error occurred when I was compiling with CFLAGS="-march=pentium-m -Os -pipe
-fomit-frame-pointer".  Removing -fomit-frame-pointer OR changing -Os to -O2
makes the problem go away.

My 'emerge --info' (with CFLAGS set to those which cause problems):

Gentoo Base System version 1.6.14
Portage 2.0.54 (default-linux/x86/2005.0, gcc-3.4.5, glibc-2.3.6-r2,
2.6.15-suspend2-r5 i686)
=================================================================
System uname: 2.6.15-suspend2-r5 i686 Intel(R) Celeron(R) M processor        
1500MHz
ccache version 2.4 [enabled]
dev-lang/python:     2.4.2
sys-apps/sandbox:    1.2.12
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r1
sys-devel/binutils:  2.16.1
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.11-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-march=pentium-m -Os -pipe -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.5/env
/usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/kde/3/share/config
/usr/share/X11/xkb /usr/share/config /usr/share/namazu/template
/var/qmail/control"
CONFIG_PROTECT_MASK="/etc/eselect/compiler /etc/gconf /etc/splash /etc/terminfo
/etc/texmf/web2c /etc/env.d"
CXXFLAGS="-march=pentium-m -Os -pipe -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig ccache distlocks sandbox sfperms strict userpriv
usersandbox"
GENTOO_MIRRORS="http://mirror.pacific.net.au/linux/Gentoo
ftp://mirror.pacific.net.au/linux/Gentoo http://ftp.swin.edu.au/gentoo
http://gentoo.seren.com/gentoo http://mirror.espri.arizona.edu/gentoo/
http://mirror.isp.net.au/ftp/pub/gentoo/
http://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/
http://mirror.datapipe.net/gentoo ftp://ftp.swin.edu.au/gentoo
http://distro.ibiblio.org/pub/linux/distributions/gentoo/"
LDFLAGS="-Wl,-O1"
LINGUAS="en_AU en_GB en"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage /usr/local/portage-java"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="x86 X aac aalib acpi aiglx alsa asf audiofile avi bash-completion berkdb
bitmap-fonts browserplugin bzip2 cap cdparanoia cdr compositor crypt cups curl
dbus dhcp directfb divx4linux dlloader doc dri dvd emboss encode ethereal exif
expat ext-doc ext-html ext-koffice ext-mail ext-openoffice ext-pdf ext-ppt
ext-ps ext-rtf ext-tex ext-xls extras fam fbcon fbsplash firefox flac
fontconfig foomaticdb fortran gcj gd gdbm gif glitz glut glx gmp gstreamer
guile hal hdf5 i8x0 idn imagemagick imlib ipv6 isdnlog java javascript jikes
jpeg junit kde kdeenablefinal kdepim kdgraphics lcms libg++ libwww lua lzo lzw
mad mikmod mmx mmx2 mmxext mng mod mono motif mozsvg mp3 mpeg musicbrainz mysql
ncurses nls nowin nptl nsplugin objc offensive ogg oggvorbis ole openal opengl
oss pam pam_console pcmcia pcre pdf pdflib perl pic png ppds pppd qt rdesktop
readline recode rogue samba scanner sdl slang slp sms snmp speex spell sqlite
sse sse2 ssl subversion svg tcpd tetex theora threads tidy tiff truetype
truetype-fonts type1-fonts udev unicode usb userlocales v4l v4l2 vcd
visualization vorbis wifi win32codecs wma wmf xatrix xattr xcomposite xine xml
xml2 xscreensaver xv xvmc zeroconf zlib video_cards_i810 video_cards_i915
input_devices_synaptics input_devices_keyboard input_devices_mouse
input_devices_evdev linguas_en_AU linguas_en_GB linguas_en userland_GNU
kernel_linux elibc_glibc"
Unset:  ASFLAGS, CTARGET, INSTALL_MASK, LANG, LC_ALL

-Os seems to still cause issues with a number of things as I remember it. I
would be more tempted to substitute -O2 for -Os in this case rather than
filtering -fomit-frame-pointer. Anyone else have any opinions on this?

I concur with comment #3.

sci-mathematics/yacas-1.0.61 fixed now - -Os is replaced with -O2. Thanks for
reporting the issue.