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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||
| 0000013 | OMNeT++ | simulation kernel | public | 2008-12-01 16:08 | 2008-12-02 13:41 | ||||
| Reporter | baumgart | ||||||||
| Assigned To | andras | ||||||||
| Priority | normal | Severity | trivial | Reproducibility | always | ||||
| Status | resolved | Resolution | fixed | ||||||
| Platform | OS | OS Version | |||||||
| Product Version | 4.0b8 | ||||||||
| Target Version | Fixed in Version | 4.0rc1 | |||||||
| Summary | 0000013: several compile warnings when crosscompiling for ARM | ||||||||
| Description | There are several warnings when trying to compile omnetpp-4.0b8 with gcc for ARM with scratchbox: stringutil.cc: In function `std::string opp_quotestr(const char*)': stringutil.cc:148: warning: comparison is always true due to limited range of data type stringutil.cc: In function `bool opp_needsquotes(const char*)': stringutil.cc:165: warning: comparison is always true due to limited range of data type eventlogentry.cc: In constructor `EventLogEntry::EventLogEntry()': eventlogentry.cc:35: warning: converting of negative value `-0x00000000000000001' to `unsigned int' omnetpp-4.0b8/include/cwatch.h: In member function `virtual std::string cWatch_char::info() const': omnetpp-4.0b8/include/cwatch.h:150: warning: comparison is always true due to limited range of data type cclassdescriptor.cc: In static member function `static long int cClassDescriptor::string2enum(const char*, const char*)': cclassdescriptor.cc:126: warning: comparison is always true due to limited range of data type omnetpp-4.0b8/include/cwatch.h: In member /function `virtual std::string cWatch_char::info() const': omnetpp-4.0b8/include/cwatch.h:150: warning: /comparison is always true due to limited range of data type sim_std_m.cc: In member function `virtual void* cDensityEstBaseDescriptor::getFieldStructPointer(void*, int, int) const': sim_std_m.cc:5610: warning: taking address of temporary | ||||||||
| Tags | No tags attached. | ||||||||
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(0000035) rhornig (administrator) 2008-12-01 18:09 |
Hmm. Interesting. We have never tried to compile it for ARM. Just out of curiosity, why do you need OMNeT++ on ARM? As for the issue, the "comparison is always true due to limited range of data type" warnings are strange: r>=0 && r<' ' ? ' ':r The above line generates the warning. I don't really get how this can happen? Some googling reveals that ARM has unsigned char types by default, but even in this case the above line should be ok. ALso found http://gcc.gnu.org/ml/gcc/2006-01/msg00785.html [^] which seems to be a bug related to this warning in GCC. What compiler version do you use? It may be a compiler problem. |
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(0000038) rhornig (administrator) 2008-12-01 18:28 |
please check your compiler with a trivial program that compares characters. Does it give the same warning? |
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(0000041) baumgart (reporter) 2008-12-02 09:25 |
We have to crosscompile OMNeT++ on ARM to run OverSim on Nokia N810 Internet tablets (of course only to emulate a single overlay host and not for simulation of large networks). I don't think this is a gcc bug: char is unsigned by default on ARM. In this case the comparison r>=0 doesn't make sense and should give a warning. Probably you assume char to be signed in your code. Correct fix would be to explicitly use an "signed char". See also http://www.arm.linux.org.uk/docs/faqs/signedchar.php [^] |
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(0000042) rhornig (administrator) 2008-12-02 10:44 |
You are right. With unsiged char c >= 0 is always true. I was assuming the the compiler gave the warning for the whole expression. Ok we will check this. |
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(0000044) andras (administrator) 2008-12-02 13:41 |
Fixed in the code (except for "taking address of temporary" which will need further attention) |
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Notes |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2008-12-01 16:08 | baumgart | New Issue | |
| 2008-12-01 18:09 | rhornig | Note Added: 0000035 | |
| 2008-12-01 18:28 | rhornig | Note Added: 0000038 | |
| 2008-12-01 18:28 | rhornig | Status | new => feedback |
| 2008-12-02 09:25 | baumgart | Note Added: 0000041 | |
| 2008-12-02 10:44 | rhornig | Note Added: 0000042 | |
| 2008-12-02 10:44 | rhornig | Status | feedback => confirmed |
| 2008-12-02 11:44 | andras | Note Added: 0000043 | |
| 2008-12-02 13:41 | andras | Note Added: 0000044 | |
| 2008-12-02 13:41 | andras | Status | confirmed => resolved |
| 2008-12-02 13:41 | andras | Fixed in Version | => 4.0rc1 |
| 2008-12-02 13:41 | andras | Resolution | open => fixed |
| 2008-12-02 13:41 | andras | Assigned To | => andras |
| 2008-12-05 00:15 | andras | Note Deleted: 0000043 | |
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Issue History |
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