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| From | Shankar <shankarke@gmail.com> |
| Newsgroups | comp.compilers |
| Subject | Re: GCC/G++ compiler: Error goes away when run through debugger |
| Date | Fri, 1 Apr 2011 15:31:09 -0700 (PDT) |
| Organization | Compilers Central |
| Lines | 24 |
| Sender | news@iecc.com |
| Approved | comp.compilers@iecc.com |
| Message-ID | <11-04-003@comp.compilers> (permalink) |
| References | <11-03-054@comp.compilers> <11-03-061@comp.compilers> <11-03-063@comp.compilers> |
| NNTP-Posting-Host | news.iecc.com |
| X-Trace | gal.iecc.com 1301787969 41930 64.57.183.58 (2 Apr 2011 23:46:09 GMT) |
| X-Complaints-To | abuse@iecc.com |
| NNTP-Posting-Date | Sat, 2 Apr 2011 23:46:09 +0000 (UTC) |
| Keywords | GCC, debug, optimize |
| Posted-Date | 02 Apr 2011 19:46:09 EDT |
| X-submission-address | compilers@iecc.com |
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| Xref | x330-a1.tempe.blueboxinc.net comp.compilers:70 |
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On Mar 29, 2:42 pm, i...@localhost.claranet.nl (Ike Naar) wrote: > George Neuner <gneun...@comcast.net> wrote: > > >GCC's -O3 optimization level is widely known to cause strange problems > >... almost always because the program is violating assumptions made by > >the more advanced optimizations. > > >The -O2 level typically is safe. If you think you need the -O3 > >optimizations, you should individually enable them to see if any > >breaks the program. Specify -O3 only if you find they all work. > > Sometimes using -O3 makes the program run slower than when using -O2. I think you should use some tool like valgrind which might immediately catch the problem that would be going on. Also when you use -ggdb I think some of the strings are loaded in the .data section but gets loaded into the .const data section otherwise. - Shankar
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Re: GCC/G++ compiler: Error goes away when run through debugger George Neuner <gneuner2@comcast.net> - 2011-03-29 12:18 -0400
Re: GCC/G++ compiler: Error goes away when run through debugger ike@localhost.claranet.nl (Ike Naar) - 2011-03-29 21:42 +0000
Re: GCC/G++ compiler: Error goes away when run through debugger George Neuner <gneuner2@comcast.net> - 2011-03-31 01:34 -0400
Re: GCC/G++ compiler: Error goes away when run through debugger Shankar <shankarke@gmail.com> - 2011-04-01 15:31 -0700
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