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<!--$Id: flags.so,v 10.6 2000/12/01 00:19:10 bostic Exp $-->
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<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
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<title>Berkeley DB Reference Guide: Changing compile or load options</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<a name="2"><!--meow--></a> <a name="3"><!--meow--></a>
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<table><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Building Berkeley DB for UNIX systems</dl></h3></td>
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<td width="1%"><a href="../../ref/build_unix/conf.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/build_unix/install.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p>
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<h1 align=center>Changing compile or load options</h1>
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<p>You can specify compiler and/or compile and load time flags by using
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environment variables during Berkeley DB configuration. For example, if you
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want to use a specific compiler, specify the CC environment variable
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before running configure:
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<p><blockquote><pre>prompt: env CC=gcc ../dist/configure</pre></blockquote>
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<p>Using anything other than the native compiler will almost certainly mean
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that you'll want to check the flags specified to the compiler and
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loader, too.
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<p>To specify debugging and optimization options for the C compiler,
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use the CFLAGS environment variable:
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<p><blockquote><pre>prompt: env CFLAGS=-O2 ../dist/configure</pre></blockquote>
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<p>To specify header file search directories and other miscellaneous options
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for the C preprocessor and compiler, use the CPPFLAGS environment variable:
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<p><blockquote><pre>prompt: env CPPFLAGS=-I/usr/contrib/include ../dist/configure</pre></blockquote>
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<p>To specify debugging and optimization options for the C++ compiler,
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use the CXXFLAGS environment variable:
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<p><blockquote><pre>prompt: env CXXFLAGS=-Woverloaded-virtual ../dist/configure</pre></blockquote>
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<p>To specify miscellaneous options or additional library directories for
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the linker, use the LDFLAGS environment variable:
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<p><blockquote><pre>prompt: env LDFLAGS="-N32 -L/usr/local/lib" ../dist/configure</pre></blockquote>
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<p>If you want to specify additional libraries, set the LIBS environment
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variable before running configure. For example:
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<p><blockquote><pre>prompt: env LIBS="-lposix -lsocket" ../dist/configure</pre></blockquote>
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<p>would specify two additional libraries to load, "posix" and "socket".
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<p>Make sure that you prepend -L to any library directory names and that you
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prepend -I to any include file directory names! Also, if the arguments
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you specify contain blank or tab characters, be sure to quote them as
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shown above, i.e. with single or double quotes around the values you're
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specifying for LIBS.
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<p>The env command is available on most systems, and simply sets one or more
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environment variables before running a command. If the env command is
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not available to you, you can set the environment variables in your shell
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before running configure. For example, in sh or ksh, you could do:
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<p><blockquote><pre>prompt: LIBS="-lposix -lsocket" ../dist/configure</pre></blockquote>
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<p>and in csh or tcsh, you could do:
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<p><blockquote><pre>prompt: setenv LIBS "-lposix -lsocket"
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prompt: ../dist/configure</pre></blockquote>
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<p>See your command shell's manual page for further information.
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<table><tr><td><br></td><td width="1%"><a href="../../ref/build_unix/conf.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../ref/toc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/build_unix/install.html"><img src="../../images/next.gif" alt="Next"></a>
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</td></tr></table>
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<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
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