1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>FAQ.2. Run Time Problems</title><link rel="stylesheet" href="../xml/XSLCustomizationLayer/G4HTMLStylesheet.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.71.1"><link rel="start" href="index.html" title="Geant4 User's Guide for Application Developers"><link rel="up" href="ch10.html" title="Chapter FAQ. Frequentry Asked Questions"><link rel="prev" href="ch10.html" title="Chapter FAQ. Frequentry Asked Questions"><link rel="next" href="ch10s03.html" title="FAQ.3. Geometry"><script language="JavaScript"> |
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8 | </script></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">FAQ.2. |
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9 | Run Time Problems |
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10 | </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch10.html"><img src="AllResources/IconsGIF/prev.gif" alt="Prev"></a> </td><th width="60%" align="center">Chapter FAQ. |
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11 | Frequentry Asked Questions |
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13 | Run Time Problems |
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14 | </h2></div></div></div><div class="qandaset"><table border="0" summary="Q and A Set"><col align="left" width="1%"><tbody><tr class="question"><td align="left" valign="top"><a name="qanda.RunTimeProb.SegFltInExmp"></a><a name="id553561"></a><b>Q:</b></td><td align="left" valign="top"><p> |
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15 | On Linux, I get a segmentation fault as soon as I run one of the official |
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16 | examples. |
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17 | </p></td></tr><tr class="answer"><td align="left" valign="top"><b>A:</b></td><td align="left" valign="top"><p> |
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18 | Check that the CLHEP library has been installed and compiled coherently |
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19 | with the same compiler you use for installing Geant4 and for the same |
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20 | version of Linux distribution. For example, a binary object produced with |
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21 | Red-Hat 7.X is not fully compatible with binaries running on RH 9.X or |
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22 | higher, due to different libc used in the two configurations. |
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23 | </p></td></tr><tr class="question"><td align="left" valign="top"><a name="qanda.RunTimeProb.ErrShareLib"></a><a name="id553584"></a><b>Q:</b></td><td align="left" valign="top"><p> |
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24 | I installed Geant4 libraries and built my application, when I try to run |
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25 | it I get: |
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26 | </p><div class="informalexample"><pre class="programlisting"> |
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27 | error in loading shared libraries: |
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28 | libCLHEP.so: cannot open shared object file: |
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29 | No such file or directory. |
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30 | </pre></div><p> |
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31 | </p></td></tr><tr class="answer"><td align="left" valign="top"><b>A:</b></td><td align="left" valign="top"><p> |
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32 | Your installation of CLHEP includes shared libraries. You need to specify |
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33 | the path where libCLHEP.so is installed through your environment variable |
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34 | <code class="literal">LD_LIBRARY_PATH</code>. For example, in tcsh UNIX shell: |
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35 | </p><div class="informalexample"><pre class="programlisting"> |
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36 | setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$CLHEP_BASE_DIR/lib |
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37 | </pre></div><p> |
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38 | </p></td></tr><tr class="question"><td align="left" valign="top"><a name="qanda.RunTimeProb.errFPE"></a><a name="id553626"></a><b>Q:</b></td><td align="left" valign="top"><p> |
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39 | On my system I get a Floating Point Exception (FPE) since some physics |
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40 | processes sometimes return <code class="literal">DBL_MAX</code> as interaction |
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41 | length and this number is afterwards multiplied by a number greater |
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42 | than 1. |
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43 | </p></td></tr><tr class="answer"><td align="left" valign="top"><b>A:</b></td><td align="left" valign="top"><p> |
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44 | Geant4 coding conventions and installation setup explicitly follow the |
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45 | ANSI/IEEE-754 Standard for the initialization of floating-point |
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46 | arithmetic hardware and portability. The Standard foresees floating-point |
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47 | arithmetic to be nonstop and underflows to be gradual. On DEC platforms, |
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48 | for example, the ANSI/IEEE-754 Standard compliance needs to be explicitly |
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49 | set (since deactivated by default); in this case we use infact the option |
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50 | "-ieee" on the DEC/cxx native C++ compiler to achieve this. You should |
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51 | check if your compiler provides compilation options for activating Standard |
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52 | initialization of FP arithmetic (it may be platform specific). |
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53 | </p></td></tr></tbody></table></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch10.html"><img src="AllResources/IconsGIF/prev.gif" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="ch10.html"><img src="AllResources/IconsGIF/up.gif" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="ch10s03.html"><img src="AllResources/IconsGIF/next.gif" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">Chapter FAQ. |
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54 | Frequentry Asked Questions |
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55 | </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="AllResources/IconsGIF/home.gif" alt="Home"></a></td><td width="40%" align="right" valign="top"> FAQ.3. |
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56 | Geometry |
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