#50: g.copy segfaults (debian.gfoss.it package) [and latest SVN]
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Reporter: steko | Owner: [email protected]
Type: defect | Status: new
Priority: major | Milestone: 6.4.0
Component: default | Version: 6.3.0 RCs
Resolution: | Keywords: g.copy
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Comment (by dylan):
Some updates:
Glyn says that this can only really be debugged by looking at assembly.
Since I cannot do that, another approach might be toggling various
optimization flags in order to get an idea of what may be causing the
segfault. Below are some details on my system / optimization flags /
results.
GCC details:
{{{
gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --enable-
languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-
shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --with-gxx-include-
dir=/usr/include/c++/4.1.3 --program-suffix=-4.1 --enable-__cxa_atexit
--enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --with-
tune=i686 --enable-checking=release i486-linux-gnu
Thread model: posix
gcc version 4.1.3 20070601 (prerelease) (Debian 4.1.2-12)
}}}
compile flags that cause a segfault:
-O3 (probably segfault)
-O2 (segfault)
-O1 (or) -O (segfault)
-O0 (works as expected)
The actual CFLAGS for no optimization were: {{{export
CFLAGS="-march=opteron -O0 -ggdb -Wall -Werror-implicit-function-
declaration" ; export CXXFLAGS="-march=opteron -O0" ./configure ...}}} .
So it is probably one of these flags that is causing the optimization-
related segfault:
{{{
-fauto-inc-dec
-fcprop-registers
-fdce
-fdefer-pop
-fdelayed-branch
-fdse
-fguess-branch-probability
-fif-conversion2
-fif-conversion
-finline-small-functions
-fipa-pure-const
-fipa-reference
-fmerge-constants
-fsplit-wide-types
-ftree-ccp
-ftree-ch
-ftree-copyrename
-ftree-dce
-ftree-dominator-opts
-ftree-dse
-ftree-fre
-ftree-sra
-ftree-ter
-funit-at-a-time
}}}
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/50#comment:4>
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