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| <title>The GNU Fortran Compiler: Runtime</title> |
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| Next: <a href="Fortran-2003-and-2008-status.html#Fortran-2003-and-2008-status" accesskey="n" rel="next">Fortran 2003 and 2008 status</a>, Previous: <a href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" accesskey="p" rel="prev">Invoking GNU Fortran</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Runtime_003a-Influencing-runtime-behavior-with-environment-variables"></a> |
| <h2 class="chapter">3 Runtime: Influencing runtime behavior with environment variables</h2> |
| <a name="index-environment-variable-1"></a> |
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| <p>The behavior of the <code>gfortran</code> can be influenced by |
| environment variables. |
| </p> |
| <p>Malformed environment variables are silently ignored. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="TMPDIR.html#TMPDIR" accesskey="1">TMPDIR</a>:</td><td> </td><td align="left" valign="top">Directory for scratch files |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fSTDIN_005fUNIT.html#GFORTRAN_005fSTDIN_005fUNIT" accesskey="2">GFORTRAN_STDIN_UNIT</a>:</td><td> </td><td align="left" valign="top">Unit number for standard input |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fSTDOUT_005fUNIT.html#GFORTRAN_005fSTDOUT_005fUNIT" accesskey="3">GFORTRAN_STDOUT_UNIT</a>:</td><td> </td><td align="left" valign="top">Unit number for standard output |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fSTDERR_005fUNIT.html#GFORTRAN_005fSTDERR_005fUNIT" accesskey="4">GFORTRAN_STDERR_UNIT</a>:</td><td> </td><td align="left" valign="top">Unit number for standard error |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fUNBUFFERED_005fALL.html#GFORTRAN_005fUNBUFFERED_005fALL" accesskey="5">GFORTRAN_UNBUFFERED_ALL</a>:</td><td> </td><td align="left" valign="top">Do not buffer I/O for all units. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fUNBUFFERED_005fPRECONNECTED.html#GFORTRAN_005fUNBUFFERED_005fPRECONNECTED" accesskey="6">GFORTRAN_UNBUFFERED_PRECONNECTED</a>:</td><td> </td><td align="left" valign="top">Do not buffer I/O for preconnected units. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fSHOW_005fLOCUS.html#GFORTRAN_005fSHOW_005fLOCUS" accesskey="7">GFORTRAN_SHOW_LOCUS</a>:</td><td> </td><td align="left" valign="top">Show location for runtime errors |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fOPTIONAL_005fPLUS.html#GFORTRAN_005fOPTIONAL_005fPLUS" accesskey="8">GFORTRAN_OPTIONAL_PLUS</a>:</td><td> </td><td align="left" valign="top">Print leading + where permitted |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fDEFAULT_005fRECL.html#GFORTRAN_005fDEFAULT_005fRECL" accesskey="9">GFORTRAN_DEFAULT_RECL</a>:</td><td> </td><td align="left" valign="top">Default record length for new files |
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| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fLIST_005fSEPARATOR.html#GFORTRAN_005fLIST_005fSEPARATOR">GFORTRAN_LIST_SEPARATOR</a>:</td><td> </td><td align="left" valign="top">Separator for list output |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fCONVERT_005fUNIT.html#GFORTRAN_005fCONVERT_005fUNIT">GFORTRAN_CONVERT_UNIT</a>:</td><td> </td><td align="left" valign="top">Set endianness for unformatted I/O |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="GFORTRAN_005fERROR_005fBACKTRACE.html#GFORTRAN_005fERROR_005fBACKTRACE">GFORTRAN_ERROR_BACKTRACE</a>:</td><td> </td><td align="left" valign="top">Show backtrace on run-time errors |
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