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136 GNU make

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Warning: The load directive and extension capability is considered a “technology

preview” in this release of GNU make. We encourage you to experiment with this

feature and we appreciate any feedback on it. However we cannot guarantee to

maintain backward-compatibility in the next release. Consider using GNU Guile

instead for extending GNU make (see Section 8.14 [The guile Function], page 97).

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Many operating systems provide a facility for dynamically loading compiled objects. If

your system provides this facility, GNU make can make use of it to load dynamic objects at

runtime, providing new capabilities which may then be invoked by your makeﬁle.

The load directive is used to load a dynamic object. Once the object is loaded, a “setup”

function will be invoked to allow the object to initialize itself and register new facilities

with GNU make. A dynamic object might include new make functions, for example, and

the “setup” function would register them with GNU make’s function handling system.

12.2.1 The load Directive

Objects are loaded into GNU make by placing the load directive into your makeﬁle. The

syntax of the load directive is as follows:

load object-file ...

or:

load object-file(symbol-name) ...

The ﬁle object-ﬁle is dynamically loaded by GNU make. If object-ﬁle does not include

a directory path then it is ﬁrst looked for in the current directory. If it is not found there,

or a directory path is included, then system-speciﬁc paths will be searched. If the load fails

for any reason, make will print a message and exit.

If the load succeeds make will invoke an initializing function.

If symbol-name is provided, it will be used as the name of the initializing function.

If no symbol-name is provided, the initializing function name is created by taking the

base ﬁle name of object-ﬁle, up to the ﬁrst character which is not a valid symbol name

character (alphanumerics and underscores are valid symbol name characters). To this preﬁx

will be appended the suﬃx _gmk_setup.

More than one object ﬁle may be loaded with a single load directive, and both forms of

load arguments may be used in the same directive.

The initializing function will be provided the ﬁle name and line number of the invocation

of the load operation. It should return a value of type int, which must be 0 on failure and

non-0 on success. If the return value is -1, then GNU make will not attempt to rebuild the

object ﬁle (see

Section 12.2.2 [How Loaded Objects Are Remade], page 137).

For example:

load ../mk_funcs.so

will load the dynamic object ../mk_funcs.so. After the object is loaded, make will

invoke the function (assumed to be deﬁned by the shared object) mk_funcs_gmk_setup.

On the other hand:

load ../mk_funcs.so(init_mk_func)

will load the dynamic object ../mk_funcs.so. After the object is loaded, make will

invoke the function init_mk_func.

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