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define: DUK_OPT_HAVE_CUSTOM_H
introduced: 1.0.0
deprecated: 1.3.0
tags:
- portability
description: >
Normally you define DUK_OPT_xxx feature options and the autodetecting
duk_config.h (previously internal duk_features.h.in) header resolves
these with platform/compiler constraints to determine effective compilation
options for Duktape internals. The effective options are provided as
DUK_USE_xxx defines which you normally never see.
If you define DUK_OPT_HAVE_CUSTOM_H, Duktape will include "duk_custom.h"
after determining the appropriate DUK_USE_xxx defines but before compiling
any code. The duk_custom.h header, which you provide, can then tweak the
active DUK_USE_xxx defines freely. See duk_config.h and genconfig option
metadata for the available defines.
This approach is useful when the DUK_OPT_xxx feature options don't
provide enough flexibility to tweak the build. The downside is that you can
easily create inconsistent DUK_USE_xxx flags, the customization header
will be version specific, and you need to peek into Duktape internals to
know what defines to tweak.
NOTE: This option is deprecated. The preferred method for customization
starting from Duktape 1.3.0 is to create/modify a "duk_config.h" header.