Description

Build environment checking for node.js.

This allows for autoconf-like functionality for node addons/build scripts.

Note: Obsolete and/or exotic build environments or platforms not supported by node.js are not supported.

Requirements

• node.js -- v10.0.0 or newer
• Supported compilers:
  • gcc
  • clang
  • MSVC 2013+ and Windows SDK 8.1+

Installation

npm install buildcheck

Examples

Check if a C function exists

'use strict';

const BuildEnvironment = require('buildcheck');

const buildEnv = new BuildEnvironment();

console.log(buildEnv.checkFunction('c', 'preadv2'));

Check if a C header is usable

'use strict';

const BuildEnvironment = require('buildcheck');

const buildEnv = new BuildEnvironment();

console.log(buildEnv.checkHeader('c', 'linux/io_uring.h'));

Try to compile some C code

'use strict';

const BuildEnvironment = require('buildcheck');

const buildEnv = new BuildEnvironment();

// Should be a successful compile
console.log(buildEnv.tryCompile('c', 'int main() { return 0; }'));

// Should be a failed compile
console.log(buildEnv.tryCompile('c', 'int main() { return z; }'));

API

Exports

The exported value is BuildEnvironment, the main class for dealing with a build environment.

BuildEnvironment

Methods

• (constructor)([< object >config]) - Creates and returns a new BuildEnvironment instance. config may contain:

  • compilerC - string - C compiler command to use. Note: this is ignored on Windows. Default: process.env.CC or 'cc'

  • compilerCXX - string - C++ compiler command to use. Note: this is ignored on Windows. Default: process.env.CXX or 'c++'

  • msvs_version - mixed - A string or number containing the year of the Visual Studio compiler to use. Note: this is for Windows only. Default: newest version installed

• checkDeclared(< string >lang, < string >symbolName[, < object >options]) - boolean - Checks if a symbol symbolName is declared where lang is either 'c' or 'c++'. Returns true if symbol exists, false otherwise. options may contain:

  • headers - array - A list of headers to try when checking if the symbol is declared. checkFunction() will always first try without a library. If not supplied, a default list of common (platform-specific) headers will be used.

  • searchLibs - array - A list of library names (without the '-l' prefix) to try when checking if the symbol is declared. checkDeclared() will always first try without a library.

• checkFunction(< string >lang, < string >functionName[, < object >options]) - boolean - Checks if a function functionName exists and is linkable where lang is either 'c' or 'c++'. Returns true if function exists, false otherwise. options may contain:

  • searchLibs - array - A list of library names (without the '-l' prefix) to try when checking for this function. checkFunction() will always first try without a library.

• checkFeature(< string >featureName) - mixed - Executes a special test for a "feature" and returns the result. Supported values for featureName:

  • 'strerror_r' - Returns an object containing:

    • declared - boolean - Whether strerror_r() is declared

    • returnsCharPtr - boolean - If strerror_r() is declared, whether it returns char* (a GNU extension) or not.

• checkHeader(< string >lang, < string >headerName) - boolean - Checks if the header headerName exists and is usable where lang is either 'c' or 'c++'. Returns true if the header exists and is usable, false otherwise.

• defines([< string >lang[, < boolean >rendered]]) - array - Returns a list of features, functions, headers, and symbols known to be defined by this build environment instance. lang is either 'c' or 'c++' If lang is not set, defines for both 'c' and 'c++' will be returned. If rendered is true (defaults to false), autoconf-style defines (e.g. "HAVE_FOO=1") will be returned instead. Defines coming from features utilize base strings/names from autoconf for better compatibility.

• libs([< string >lang]) - array - Returns a list of ('-l'-prefixed) libraries known to be required for features and functions defined by this build environment instance. lang is either 'c' or 'c++' If lang is not set, defines for both 'c' and 'c++' will be returned.

• tryCompile(< string >lang, < string >code[, < array >compilerParams]) - mixed - Attempts to compile code where lang is either 'c' or 'c++'. compilerParams is an optional array of compiler/linker flags to include. Returns true on successful compilation, or an Error instance with an output property containing the compiler error output.