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>章 46. Zend API：深入 PHP 内核</TD
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><H1
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><A
NAME="zend.configuration-macros"
>Reference: Some Configuration Macros</A
></H1
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="zend.configuration-macros.config-m4"
><TT
CLASS="filename"
>config.m4</TT
></A
></H2
><P
> The file <TT
CLASS="filename"
>config.m4</TT
> is processed by
<TT
CLASS="filename"
>buildconf</TT
> and must contain all the instructions to be
executed during configuration. For example, these can include tests for required
external files, such as header files, libraries, and so on. PHP defines a set of macros
that can be used in this process, the most useful of which are described in
<A
HREF="zend.configuration-macros.html#tab.m4-macros"
>表 46-18</A
>.
</P
><DIV
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><A
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></A
><P
><B
>表 46-18. M4 Macros for <TT
CLASS="filename"
>config.m4</TT
></B
></P
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><TD
>Macro</TD
><TD
>Description</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_MSG_CHECKING(message)</TT
></TD
><TD
>Prints a "checking <message>" text
during <TT
CLASS="filename"
>configure</TT
>.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_MSG_RESULT(value)</TT
></TD
><TD
>Gives the result to <TT
CLASS="literal"
>AC_MSG_CHECKING</TT
>;
should specify either <TT
CLASS="literal"
>yes</TT
> or <TT
CLASS="literal"
>no</TT
> as <CODE
CLASS="envar"
>value</CODE
>.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_MSG_ERROR(message)</TT
></TD
><TD
>Prints <CODE
CLASS="envar"
>message</CODE
> as error message
during <TT
CLASS="filename"
>configure</TT
> and aborts the script.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_DEFINE(name,value,description)</TT
></TD
><TD
>Adds
<TT
CLASS="literal"
>#define</TT
> to <TT
CLASS="filename"
>php_config.h</TT
> with the value of
<CODE
CLASS="envar"
>value</CODE
> and a comment that says <CODE
CLASS="envar"
>description</CODE
> (this
is useful for conditional compilation of your module).</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_ADD_INCLUDE(path)</TT
></TD
><TD
>Adds a compiler include path; for example, used if the
module needs to add search paths for header files.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_ADD_LIBRARY_WITH_PATH(libraryname,librarypath)</TT
></TD
><TD
>Specifies an additional library to link.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>AC_ARG_WITH(modulename,description,unconditionaltest,conditionaltest)</TT
></TD
><TD
>Quite a powerful macro, adding the
module with <CODE
CLASS="envar"
>description</CODE
> to the
<TT
CLASS="filename"
>configure --help</TT
> output. PHP checks
whether the option
<TT
CLASS="literal"
>--with-<modulename></TT
> is given to the
<TT
CLASS="filename"
>configure</TT
> script. If so, it runs the
script <TT
CLASS="literal"
>unconditionaltest</TT
> (for example,
<TT
CLASS="literal"
>--with-myext=yes</TT
>), in which case the value
of the option is contained in the variable
<CODE
CLASS="envar"
>$withval</CODE
>. Otherwise, it executes
<TT
CLASS="literal"
>conditionaltest</TT
>.
</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>PHP_EXTENSION(modulename,
[shared])</TT
></TD
><TD
>This macro is a <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> to call for PHP
to configure your extension. You can supply a second argument
in addition to your module name, indicating whether you intend compilation as a
shared module. This will result in a definition at compile time for your
source as <TT
CLASS="literal"
>COMPILE_DL_<modulename></TT
>.</TD
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