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| <h2 class="chapter">3 Runtime: Influencing runtime behavior with environment variables</h2> |
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| <p><a name="index-environment-variable-296"></a> |
| The behavior of the <samp><span class="command">gfortran</span></samp> can be influenced by |
| environment variables. |
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| <p>Malformed environment variables are silently ignored. |
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| <ul class="menu"> |
| <li><a accesskey="1" href="TMPDIR.html#TMPDIR">TMPDIR</a>: Directory for scratch files |
| <li><a accesskey="2" href="GFORTRAN_005fSTDIN_005fUNIT.html#GFORTRAN_005fSTDIN_005fUNIT">GFORTRAN_STDIN_UNIT</a>: Unit number for standard input |
| <li><a accesskey="3" href="GFORTRAN_005fSTDOUT_005fUNIT.html#GFORTRAN_005fSTDOUT_005fUNIT">GFORTRAN_STDOUT_UNIT</a>: Unit number for standard output |
| <li><a accesskey="4" href="GFORTRAN_005fSTDERR_005fUNIT.html#GFORTRAN_005fSTDERR_005fUNIT">GFORTRAN_STDERR_UNIT</a>: Unit number for standard error |
| <li><a accesskey="5" href="GFORTRAN_005fUNBUFFERED_005fALL.html#GFORTRAN_005fUNBUFFERED_005fALL">GFORTRAN_UNBUFFERED_ALL</a>: Do not buffer I/O for all units. |
| <li><a accesskey="6" href="GFORTRAN_005fUNBUFFERED_005fPRECONNECTED.html#GFORTRAN_005fUNBUFFERED_005fPRECONNECTED">GFORTRAN_UNBUFFERED_PRECONNECTED</a>: Do not buffer I/O for preconnected units. |
| <li><a accesskey="7" href="GFORTRAN_005fSHOW_005fLOCUS.html#GFORTRAN_005fSHOW_005fLOCUS">GFORTRAN_SHOW_LOCUS</a>: Show location for runtime errors |
| <li><a accesskey="8" href="GFORTRAN_005fOPTIONAL_005fPLUS.html#GFORTRAN_005fOPTIONAL_005fPLUS">GFORTRAN_OPTIONAL_PLUS</a>: Print leading + where permitted |
| <li><a accesskey="9" href="GFORTRAN_005fDEFAULT_005fRECL.html#GFORTRAN_005fDEFAULT_005fRECL">GFORTRAN_DEFAULT_RECL</a>: Default record length for new files |
| <li><a href="GFORTRAN_005fLIST_005fSEPARATOR.html#GFORTRAN_005fLIST_005fSEPARATOR">GFORTRAN_LIST_SEPARATOR</a>: Separator for list output |
| <li><a href="GFORTRAN_005fCONVERT_005fUNIT.html#GFORTRAN_005fCONVERT_005fUNIT">GFORTRAN_CONVERT_UNIT</a>: Set endianness for unformatted I/O |
| <li><a href="GFORTRAN_005fERROR_005fBACKTRACE.html#GFORTRAN_005fERROR_005fBACKTRACE">GFORTRAN_ERROR_BACKTRACE</a>: Show backtrace on run-time errors |
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