2 add a new target to bindinggyp
The contents of index. At this point, we need to add a package. These files will end up changing a bit when we add node-pre-gyp support. Executing the project will result in the realization that the Node.
The goal of this post is now to turn this addon into a pre-built executable or set of executables that can be deployed to different platforms with the same ease-of-use, without the build step requirement. As described above, node-pre-gyp is a tool that makes it easy to deploy platform-specific binaries to a host i. This means that as long as you pre-build and deploy your native addon for all of your supported platforms OS, architecture, Node.
Next, we need to drop a new section into this same file to tell node-pre-gyp how to name the binaries that it will create. These are all automatically determined by node-pre-gyp when it build the binary packages to be deployed. They go as follows:. The preinstall entry is just telling npm to install node-pre-gyp before doing anything else.
The --fallback-to-build flag tells node-pre-gyp to do the full build if it cannot locate the required binaries the specified remote host. Until we actually start deploying, this will always be the case, and the addon will build using the end-user local compiler as it has done before. Lastly, but perhaps most importantly, we need to modify how a program require ing this addon finds the main entry point. Recall our original package. This no longer holds though, now the binary addon will hopefully be found, pre-built, on a remote host.
This bit of code loads node-pre-gyp , shows it where the package. Code require ing this addon still works the same way - but now node-pre-gyp is locating the binary. The binary entry in package.
Check out the binding. Your final file structure should look like this, with the only change being the new index. Do an npm install again, and you should see some new messages printing to the screen…. In the printout, you should see the node-pre-gyp install --fallback-to-build command being executed. Tried to download and node-pre-gyp ERR! Pre-built binaries not found.
If all goes well, you can again run the addon with node index. Your first decision is what sort of host you want to use. If the full source is downloaded, Addons will have complete access to the full set of Node. However, if only the Node. Using this option, the Addon will have access to the full set of dependencies.
The filename extension of the compiled Addon binary is. The require function is written to look for files with the. When calling require , the. One caveat, however, is that Node. For instance, if there is a file addon. Each of the examples illustrated in this document make direct use of the Node. It is important to understand that the V8 API can, and has, changed dramatically from one V8 release to the next and one major Node.
The only difference is the set of APIs that are used by the native code. Instead of using the V8 or Native Abstractions for Node. All other instructions remain the same. Following are some example Addons intended to help developers get started. The examples make use of the V8 APIs. Refer to the online V8 reference for help with the various V8 calls, and V8's Embedder's Guide for an explanation of several concepts used such as handles, scopes, function templates, etc.
Full path to the input file e. A directory that can be used to place intermediate build results in, and have them be accessible to other targets. A user-defined variable may be defined in terms of other variables, but not other variables that have definitions provided in the same scope.
They have similar syntax, differing only in the character used to introduce them. The difference the two phases of expansion is described in Early and Late Phases. These characters were chosen based upon the requirement that they not conflict with the variable format used natively by build systems. Using different characters means that no escaping mechanism was needed to differentiate between GYP variables and build system variables, and writing build system variables into GYP files is not cumbersome.
Variables may contain lists or strings, and variable expansions may occur in list or string context. There are variant forms of variable expansions that may be used to determine how each type of variable is to be expanded in each context. In addition, command expansions unlike other variable expansions may include nested variable expansions. So something like this is allowed:. You may also put commands into arrays in order to quote arguments but note that you need to use a different string quoting character:.
GYP treats command failures as indicated by a nonzero exit status during command expansion as errors. Conditionals use the same set of variables used for variable expansion. As with variable expansion, there are two phases of conditional evaluation:. The syntax for each type is identical, they differ only in the key name used to identify them and the timing of their evaluation.
A more complete description of syntax and use is provided in conditions. The difference the two phases of evaluation is described in Early and Late Phases. The typical use case for a late-phase expansion is to provide, in some globally-included. During any expansion and evaluation phase, both expansion and evaluation are performed simultaneously. The process for handling variable expansions and conditional evaluation within a dictionary is:.
It is thought to be far more worthwhile to provide resolved automatic variables to conditional sections, though. For example, a target might require that all of its dependents add certain directories to their include paths, link against special libraries, or define certain preprocessor macros.
There are three types of such sections:. Dependent settings processing merges a copy of the relevant dependent settings dictionary from a dependency into its relevant dependent targets. The precise meaning of a dependency relationship varies with the types of the targets at either end of the relationship. In GYP, a dependency relationship can indicate two things about how targets relate to each other:. The analysis of the first item is complicated by the differences between static and shared libraries.
Because the linkable targets link against these static libraries, they are also made direct dependents of the static libraries. As part of this process, GYP is also able to remove the direct dependency relationships between two static library targets, as a dependent static library does not actually need to link against a dependency static library. This removal facilitates speedier builds under some build systems, as they are now free to build the two targets in parallel.
The removal of this dependency is incorrect in some cases, such as when the dependency target contains rules or actions that generate header files required by the dependent target. This setting instructs GYP to not remove the dependency link between two static library targets in its generated output.
When GYP runs, it loads all. These files are not merged into the files that reference them, but they may contain special sections that are merged into dependent target dictionaries. Exclusion lists are most powerful when used in conjunction with conditionals. An exclusion list provides a way to remove items from the related list based on exact matching. Any item found in an exclusion list will be removed from the corresponding base list.