From: Tim Hartley <poobahtim@gmail.com>
To: gcc-help@gcc.gnu.org
Subject: Problem with GCC 4.3.2
Date: Fri, 05 Mar 2010 23:40:00 -0000 [thread overview]
Message-ID: <b159bd701003051540p603b7c5axf3eb18b1aba96e71@mail.gmail.com> (raw)
I'm having trouble with the optimization options on GCC 4.3.2; it
causes a segmentation fault. My question is, what is happening in -O1
that I can't see in --help=optimizers?
The brief version is that I am using a middleware application to run a
distributed application using mvapich 1.1. Due to the complexity, it's
unlikely I'd ever be able to file a real bug report, due to the
problems of following the bug reporting guidelines. I don't mind just
working around the problem and removing the offending compiler
optimization switch, but even doing that doesn't work as I expect.
More details:
$ uname -a
Linux ac.ncsa.uiuc.edu 2.6.27.41-170.2.117.fc10.x86_64 #1 SMP Thu Dec
10 10:36:29 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/redhat-release
Fedora release 10 (Cambridge)
$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap
--enable-shared --enable-threads=posix --enable-checking=release
--with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada
--enable-java-awt=gtk --disable-dssi --enable-plugin
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre
--enable-libgcj-multifile --enable-java-maintainer-mode
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--disable-libjava-multilib --with-cpu=generic
--build=x86_64-redhat-linux
Thread model: posix
gcc version 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC)
When I use -O1 to compile my middleware (where the error occurs), I
get a segmentation fault. Using -O0 or simply not including any -O
option doesn't.
When I look at the options as suggested in the manpage:
g++ -c -Q -O1 --help=optimizers > O1-opts
I can then simply enable all of them by hand. The funny thing is that
this passes! So my question is, what is happening in -O1 that I can't
see in --help=optimizers?
Here's what options are enabled with -O1
$ cat O1-opts
The following options control optimizations:
-falign-jumps [disabled]
-falign-labels [disabled]
-falign-loops [enabled]
-fargument-alias [enabled]
-fargument-noalias [disabled]
-fargument-noalias-anything [disabled]
-fargument-noalias-global [disabled]
-fasynchronous-unwind-tables [enabled]
-fbranch-count-reg [enabled]
-fbranch-probabilities [disabled]
-fbranch-target-load-optimize [disabled]
-fbranch-target-load-optimize2 [disabled]
-fbtr-bb-exclusive [disabled]
-fcaller-saves [disabled]
-fcommon [enabled]
-fcprop-registers [enabled]
-fcrossjumping [disabled]
-fcse-follow-jumps [disabled]
-fcse-skip-blocks [disabled]
-fcx-limited-range [disabled]
-fdata-sections [disabled]
-fdce [enabled]
-fdefer-pop [enabled]
-fdelayed-branch [disabled]
-fdelete-null-pointer-checks [disabled]
-fdse [enabled]
-fearly-inlining [enabled]
-fexceptions [disabled]
-fexpensive-optimizations [disabled]
-ffinite-math-only [disabled]
-ffloat-store [disabled]
-fforward-propagate [disabled]
-fgcse [disabled]
-fgcse-after-reload [disabled]
-fgcse-las [disabled]
-fgcse-lm [enabled]
-fgcse-sm [disabled]
-fguess-branch-probability [enabled]
-fhandle-exceptions
-fif-conversion [enabled]
-fif-conversion2 [enabled]
-finline-functions [disabled]
-finline-functions-called-once [enabled]
-finline-small-functions [disabled]
-fipa-cp [disabled]
-fipa-matrix-reorg [disabled]
-fipa-pta [disabled]
-fipa-pure-const [enabled]
-fipa-reference [enabled]
-fipa-type-escape [disabled]
-fivopts [enabled]
-fjump-tables [enabled]
-fmerge-all-constants [disabled]
-fmerge-constants [enabled]
-fmodulo-sched [disabled]
-fmove-loop-invariants [enabled]
-fnon-call-exceptions [disabled]
-fomit-frame-pointer [enabled]
-foptimize-register-move [disabled]
-foptimize-sibling-calls [disabled]
-fpack-struct [disabled]
-fpack-struct=<number>
-fpeel-loops [disabled]
-fpeephole [enabled]
-fpeephole2 [disabled]
-fpredictive-commoning [disabled]
-fprefetch-loop-arrays [disabled]
-freg-struct-return [disabled]
-fregmove [disabled]
-frename-registers [enabled]
-freorder-blocks [disabled]
-freorder-blocks-and-partition [disabled]
-freorder-functions [disabled]
-frerun-cse-after-loop [enabled]
-freschedule-modulo-scheduled-loops [disabled]
-frounding-math [disabled]
-frtl-abstract-sequences [disabled]
-frtti
-fsched-interblock [enabled]
-fsched-spec [enabled]
-fsched-spec-load [disabled]
-fsched-spec-load-dangerous [disabled]
-fsched-stalled-insns [disabled]
-fsched-stalled-insns-dep [enabled]
-fsched2-use-superblocks [disabled]
-fsched2-use-traces [disabled]
-fschedule-insns [disabled]
-fschedule-insns2 [disabled]
-fsection-anchors [disabled]
-fshort-double
-fshort-enums
-fshort-wchar
-fsignaling-nans [disabled]
-fsigned-zeros [enabled]
-fsingle-precision-constant [disabled]
-fsplit-ivs-in-unroller [enabled]
-fsplit-wide-types [enabled]
-fstrict-aliasing [disabled]
-fthread-jumps [disabled]
-fno-threadsafe-statics
-ftoplevel-reorder [enabled]
-ftrapping-math [enabled]
-ftrapv [disabled]
-ftree-ccp [enabled]
-ftree-ch [enabled]
-ftree-copy-prop [enabled]
-ftree-copyrename [enabled]
-ftree-cselim [enabled]
-ftree-dce [enabled]
-ftree-dominator-opts [enabled]
-ftree-dse [enabled]
-ftree-fre [enabled]
-ftree-loop-im [enabled]
-ftree-loop-ivcanon [enabled]
-ftree-loop-linear [disabled]
-ftree-loop-optimize [enabled]
-ftree-lrs [disabled]
-ftree-pre [disabled]
-ftree-reassoc [enabled]
-ftree-salias [enabled]
-ftree-scev-cprop [enabled]
-ftree-sink [enabled]
-ftree-sra [enabled]
-ftree-store-ccp [disabled]
-ftree-ter [enabled]
-ftree-vect-loop-version [enabled]
-ftree-vectorize [disabled]
-ftree-vrp [disabled]
-funit-at-a-time [enabled]
-funroll-all-loops [disabled]
-funroll-loops [disabled]
-funsafe-loop-optimizations [disabled]
-funsafe-math-optimizations [disabled]
-funswitch-loops [disabled]
-funwind-tables [disabled]
-fvar-tracking [enabled]
-fvar-tracking-uninit [disabled]
-fvariable-expansion-in-unroller [disabled]
-fvect-cost-model [enabled]
-fvpt [disabled]
-fweb [enabled]
-fwhole-program [disabled]
-fwrapv [disabled]
I've never had this type of problem before, and I've used the
middleware with GCC 4.1.2 and -O3.
Please let me know what else I can do to help sort out this problem.
Tim
reply other threads:[~2010-03-05 23:40 UTC|newest]
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