2011-09-13 17:44:24 +00:00
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<title>Changing compile or load options</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB Installation and Build Guide" />
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<link rel="up" href="build_unix.html" title="Chapter 7. Building Berkeley DB for UNIX/POSIX" />
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<link rel="prev" href="build_unix_small.html" title="Building a small memory footprint library" />
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2012-11-14 21:35:20 +00:00
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<link rel="next" href="cross_compile_unix.html" title="Cross-Compiling on Unix" />
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2011-09-13 17:44:24 +00:00
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<div class="libver">
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2012-11-14 21:35:20 +00:00
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<p>Library Version 11.2.5.3</p>
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2011-09-13 17:44:24 +00:00
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">Changing compile or load options</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="build_unix_small.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 7.
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Building Berkeley DB for UNIX/POSIX
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</th>
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2012-11-14 21:35:20 +00:00
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<td width="20%" align="right"> <a accesskey="n" href="cross_compile_unix.html">Next</a></td>
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2011-09-13 17:44:24 +00:00
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="build_unix_flags"></a>Changing compile or load options</h2>
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</div>
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</div>
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</div>
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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
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example, if you want to use a specific compiler, specify the CC
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environment variable before running configure:</p>
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<pre class="programlisting">prompt: env CC=gcc ../dist/configure</pre>
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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.</p>
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<p>To specify debugging and optimization options for the C compiler,
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use the CFLAGS environment variable:</p>
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<pre class="programlisting">prompt: env CFLAGS=-O2 ../dist/configure</pre>
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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:</p>
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<pre class="programlisting">prompt: env CPPFLAGS=-I/usr/contrib/include ../dist/configure</pre>
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<p>To specify debugging and optimization options for the C++ compiler,
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use the CXXFLAGS environment variable:</p>
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<pre class="programlisting">prompt: env CXXFLAGS=-Woverloaded-virtual ../dist/configure</pre>
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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:</p>
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<pre class="programlisting">prompt: env LDFLAGS="-N32 -L/usr/local/lib" ../dist/configure</pre>
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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, the following would
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specify two additional libraries to load, "posix" and "socket":</p>
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<pre class="programlisting">prompt: env LIBS="-lposix -lsocket" ../dist/configure</pre>
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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 previously; that is with single or double quotes around the values
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you are specifying for LIBS.</p>
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<p>The env command, which is available on most systems, simply sets one or
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more environment variables before running a command. If the env command
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is not available to you, you can set the environment variables in your
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shell before running configure. For example, in sh or ksh, you could
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do the following:</p>
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<pre class="programlisting">prompt: LIBS="-lposix -lsocket" ../dist/configure</pre>
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<p>In csh or tcsh, you could do the following:</p>
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<pre class="programlisting">prompt: setenv LIBS "-lposix -lsocket"
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prompt: ../dist/configure</pre>
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<p>See your command shell's manual page for further information.</p>
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="build_unix_small.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="build_unix.html">Up</a>
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</td>
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2012-11-14 21:35:20 +00:00
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<td width="40%" align="right"> <a accesskey="n" href="cross_compile_unix.html">Next</a></td>
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2011-09-13 17:44:24 +00:00
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">Building a small memory footprint library </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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2012-11-14 21:35:20 +00:00
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<td width="40%" align="right" valign="top"> Cross-Compiling on Unix</td>
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2011-09-13 17:44:24 +00:00
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</tr>
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</table>
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