The file config.m4 is processed by
buildconf 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
Table 61-1.
Table 61-1. M4 Macros for config.m4
Macro
Syntax
AC_MSG_CHECKING(message)
Prints a "checking <message>" text
during configure.
AC_MSG_RESULT(value)
Gives the result to AC_MSG_CHECKING;
should specify either yes or no as value.
AC_MSG_ERROR(message)
Prints message as error message
during configure and aborts the script.
AC_DEFINE(name,value,description)
Adds
#define to php_config.h with the value of
value and a comment that says description (this
is useful for conditional compilation of your module).
AC_ADD_INCLUDE(path)
Adds a compiler include path; for example, used if the
module needs to add search paths for header files.
Quite a powerful macro, adding the
module with description to the
configure --help output. PHP checks
whether the option
--with-<modulename> is given to the
configure script. If so, it runs the
script unconditionaltest (for example,
--with-myext=yes), in which case the value
of the option is contained in the variable
$withval. Otherwise, it executes
conditionaltest.
PHP_EXTENSION(modulename,
[shared])
This macro is a must 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 COMPILE_DL_<modulename>.
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