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<title>14.1.9 Libraries with exported templates </title>
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<a name="1207793"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">14.1.9 Libraries with exported templates</font>
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<a name="1207794"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Typically a (non-export) library consists of an <font size=2 face=Courier><strong>include</strong></font><font face="Verdana, Arial, Helvetica, sans-serif"><i> </i></font>directory and a <font size=2 face=Courier><strong>lib</strong></font><font face="Verdana, Arial, Helvetica, sans-serif"><i> </i></font>directory. The <font size=2 face=Courier><strong>include</strong></font> directory contains the header files required by users of the library and the <font size=2 face=Courier><strong>lib</strong></font> directory contains the object code libraries that client programs must use when linking programs.</font>
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<a name="1207795"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">With exported templates, users of the library must also have access to the source code of the exported templates and the information contained in the associated "<font size=2 face=Courier><strong>.et</strong></font>" files. This information should be placed in a directory that is distributed along with the <font size=2 face=Courier><strong>include</strong></font> and <font size=2 face=Courier><strong>lib</strong></font> directories: This is the <font size=2 face=Courier><strong><em>export</em></strong></font> directory. It must be specified using the <font size=2 face=Courier><strong>exportdir</strong></font> option when compiling client programs.</font>
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<a name="1207796"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The recommended procedure to build the export directory is as follows:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="1"><a name="1207797"> </a>For each "<font size=2 face=Courier><strong>.et</strong></font>" file in the original source directory, copy the associated source file to the export directory.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="2"><a name="1207798"> </a>Concatenate all of the "<font size=2 face=Courier><strong>.et</strong></font>" files into a single "<font size=2 face=Courier><strong>.et</strong></font>" file (for example <font size=2 face=Courier><strong>mylib.et</strong></font>) in the export directory. The individual "<font size=2 face=Courier><strong>.et</strong></font>" files could be copied to the export directory, but having all of the "<font size=2 face=Courier><strong>.et</strong></font>" information in one file will make use of the library more efficient.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li value="3"><a name="1207799"> </a>Create an <font size=2 face=Courier><strong>export_info</strong></font> file in the export directory. The <font size=2 face=Courier><strong>export_info</strong></font> file specifies the include search paths to be used when recompiling files in the export directory. If no <font size=2 face=Courier><strong>export_info</strong></font> file is provided, the include search path used when compiling the client program that uses the library will also be used to recompile the library exported template files.</font></p>
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<a name="1207800"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The <font size=2 face=Courier><strong>export_info</strong></font> file consists of a series of lines of the form</font>
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<a name="1207801"> </a><font size=2 face=Courier><strong>include=<font size=2 face=Courier><strong><em>x</em></strong></font><br></strong></font>
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<a name="1207802"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">or</font>
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<a name="1207803"> </a><font size=2 face=Courier><strong>sys_include=<font size=2 face=Courier><strong><em>x</em></strong></font><br></strong></font>
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<a name="1207804"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">where <font size=2 face=Courier><strong><em>x</em></strong></font><font face="Verdana, Arial, Helvetica, sans-serif"> </font>is a path name to be placed on the include search path. The directories are searched in the order in which they <font face="Verdana, Arial, Helvetica, sans-serif">are encountered in the </font><font size=2 face=Courier><strong>export_info</strong></font> file. T<font face="Verdana, Arial, Helvetica, sans-serif">he file can also contain comments-which begin with a "</font><font size=2 face=Courier><em>#</em></font><font face="Verdana, Arial, Helvetica, sans-serif">"-and blank lines. Spaces are ignored but tabs are not currently permitted. For example:</font></font>
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<a name="1207805"> </a><font size=2 face=Courier><strong><font size=2 face=Courier><em># The include directories to be used for the xyz library</em></font> <br>include = /disk1/xyz/include<br>sys_include = /disk2/abc/include<br>include = /disk3/jkl/include<br></strong></font>
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<a name="1207809"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The include search path specified for a client program is ignored by the front end when it processes the source in the export library, except when no <font size=2 face=Courier><strong>export_info</strong></font> file is provided. Command-line macro definitions specified for a client program are also ignored by the front end when processing a source file from the export library; the command line macros specified when the corresponding "<font size=2 face=Courier><strong>.et</strong></font>" file was produced do apply. All other compilation options (other than the include search path and command-line macro definitions) used when recompiling the exported templates will be used to compile the client program.</font>
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<a name="1207810"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When a library is installed on a new system, it is likely that the <font size=2 face=Courier><strong>export_info</strong></font> file will need to be adapted to reflect the location of the required headers on that system.</font>
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