lib/compiler-finder.js - compiler-explorer - Rivoreo Source Code Repositories

 // Copyright (c) 2018, Compiler Explorer Authors
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 //     * Redistributions of source code must retain the above copyright notice,
 //       this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above copyright
 //       notice, this list of conditions and the following disclaimer in the
 //       documentation and/or other materials provided with the distribution.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.

 import http from 'http';
 import https from 'https';
 import path from 'path';
 import { promisify } from 'util';

 import fs from 'fs-extra';
 import _ from 'underscore';
 import urljoin from 'url-join';

 import { InstanceFetcher } from './aws';
 import { logger } from './logger';

 const sleep = promisify(setTimeout);

 /***
  * Finds and initializes the compilers stored on the properties files
  */
 export class CompilerFinder {
     /***
      * @param {CompileHandler} compileHandler
      * @param {CompilerProps} compilerProps
      * @param {propsFor} awsProps
      * @param {Object} args
      * @param {Object} optionsHandler
      */
     constructor(compileHandler, compilerProps, awsProps, args, optionsHandler) {
         this.compilerProps = compilerProps.get.bind(compilerProps);
         this.ceProps = compilerProps.ceProps;
         this.awsProps = awsProps;
         this.args = args;
         this.compileHandler = compileHandler;
         this.languages = compilerProps.languages;
         this.awsPoller = null;
         this.optionsHandler = optionsHandler;
     }

     awsInstances() {
         if (!this.awsPoller) this.awsPoller = new InstanceFetcher(this.awsProps);
         return this.awsPoller.getInstances();
     }

     async fetchRemote(host, port, uriBase, props, langId) {
         const requestLib = port === 443 ? https : http;
         const uriSchema = port === 443 ? 'https' : 'http';
         const uri = urljoin(`${uriSchema}://${host}:${port}`, uriBase);
         const apiPath = urljoin('/', uriBase || '', 'api/compilers', langId || '', '?fields=all');
         logger.info(`Fetching compilers from remote source ${uri}`);
         return this.retryPromise(
             () => {
                 return new Promise((resolve, reject) => {
                     const request = requestLib.get({
                         hostname: host,
                         port: port,
                         path: apiPath,
                         headers: {
                             Accept: 'application/json',
                         },
                     }, res => {
                         let error;
                         const {statusCode, headers: {'content-type': contentType}} = res;

                         if (statusCode !== 200) {
                             error = new Error('Failed fetching remote compilers from ' +
                                 `${uriSchema}://${host}:${port}${apiPath}\n` +
                                 `Status Code: ${statusCode}`);
                         } else if (!/^application\/json/.test(contentType)) {
                             error = new Error('Invalid content-type.\n' +
                                 `Expected application/json but received ${contentType}`);
                         }
                         if (error) {
                             logger.error(error.message);
                             // consume response data to free up memory
                             res.resume();
                             reject(error);
                             return;
                         }
                         let str = '';
                         res.on('data', chunk => {
                             str += chunk;
                         });
                         res.on('end', () => {
                             try {
                                 const compilers = JSON.parse(str).map(compiler => {
                                     // Fix up old upstream implementations of Compiler Explorer
                                     // e.g. https://www.godbolt.ms
                                     // (see https://github.com/compiler-explorer/compiler-explorer/issues/1768)
                                     if (!compiler.alias) compiler.alias = [];
                                     if (typeof compiler.alias == 'string') compiler.alias = [compiler.alias];
                                     // End fixup
                                     compiler.exe = null;
                                     compiler.remote = {
                                         target: `${uriSchema}://${host}:${port}`,
                                         path: urljoin('/', uriBase, 'api/compiler', compiler.id, 'compile'),
                                     };
                                     return compiler;
                                 });
                                 resolve(compilers);
                             } catch (e) {
                                 logger.error(`Error parsing response from ${uri} '${str}': ${e.message}`);
                                 reject(e);
                             }
                         });
                     })
                         .on('error', reject)
                         .on('timeout', () => reject('timeout'));
                     request.setTimeout(this.awsProps('proxyTimeout', 1000));
                 });
             },
             `${host}:${port}`,
             props('proxyRetries', 5),
             props('proxyRetryMs', 500),
         ).catch(() => {
             logger.warn(`Unable to contact ${host}:${port}; skipping`);
             return [];
         });
     }

     async fetchAws() {
         logger.info('Fetching instances from AWS');
         const instances = await this.awsInstances();
         return Promise.all(instances.map(instance => {
             logger.info('Checking instance ' + instance.InstanceId);
             const address = this.awsProps('externalTestMode', false) ? instance.PublicDnsName : instance.PrivateDnsName;
             return this.fetchRemote(address, this.args.port, '', this.awsProps, null);
         }));
     }

     async compilerConfigFor(langId, compilerName, parentProps) {
         const base = `compiler.${compilerName}.`;

         function props(propName, def) {
             const propsForCompiler = parentProps(langId, base + propName);
             if (propsForCompiler !== undefined) return propsForCompiler;
             return parentProps(langId, propName, def);
         }

         const ceToolsPath = props('ceToolsPath', './');

         const supportsBinary = !!props('supportsBinary', true);
         const interpreted = !!props('interpreted', false);
         const supportsExecute = (interpreted || supportsBinary) && !!props('supportsExecute', true);
         const executionWrapper = props('executionWrapper', '');
         const supportsLibraryCodeFilter = !!props('supportsLibraryCodeFilter', true);

         const group = props('group', '');

         const demanglerProp = props('demangler', '');
         const demangler = demanglerProp ? path.normalize(demanglerProp.replace('${ceToolsPath}', ceToolsPath)) : '';

         const isSemVer = props('isSemVer', false);
         const baseName = props('baseName', null);
         const semverVer = props('semver', '');

         const name = props('name', compilerName);

         const baseOptions = props('baseOptions', '');
         const options = props('options', '');
         const actualOptions = _.compact([baseOptions, options]).join(' ');

         const envVars = (() => {
             const envVarsString = props('envVars', '');
             if (envVarsString === '') {
                 return [];
             }
             const arr = [];
             for (const el of envVarsString.split(':')) {
                 const [env, setting] = el.split('=');
                 arr.push([env, setting]);
             }
             return arr;
         })();
         const exe = props('exe', compilerName);
         const exePath = path.dirname(exe);
         const compilerInfo = {
             id: compilerName,
             exe: exe,
             name: isSemVer && baseName ? `${baseName} ${semverVer}` : name,
             alias: _.filter(props('alias', '').split(':'), (a) => a !== ''),
             options: actualOptions,
             versionFlag: props('versionFlag'),
             versionRe: props('versionRe'),
             explicitVersion: props('explicitVersion'),
             compilerType: props('compilerType', ''),
             demangler: demangler,
             demanglerType: props('demanglerType', ''),
             objdumper: props('objdumper', ''),
             objdumperType: props('objdumperType', ''),
             intelAsm: props('intelAsm', ''),
             instructionSet: props('instructionSet', ''),
             needsMulti: !!props('needsMulti', true),
             supportsDemangle: !!demangler,
             supportsBinary,
             interpreted,
             supportsExecute,
             executionWrapper,
             supportsLibraryCodeFilter: supportsLibraryCodeFilter,
             postProcess: props('postProcess', '').split('|'),
             lang: langId,
             group: group,
             groupName: props('groupName', ''),
             includeFlag: props('includeFlag', '-isystem'),
             includePath: props('includePath', ''),
             linkFlag: props('linkFlag', '-l'),
             rpathFlag: props('rpathFlag', '-Wl,-rpath,'),
             libpathFlag: props('libpathFlag', '-L'),
             libPath: props('libPath', ''),
             ldPath: props('ldPath', '')
                 .split('|')
                 .map(x => path.normalize(x.replace('${exePath}', exePath))),
             envVars: envVars,
             notification: props('notification', ''),
             isSemVer: isSemVer,
             semver: semverVer,
             libsArr: this.getSupportedLibrariesArr(props, langId),
             tools: _.omit(
                 this.optionsHandler.get().tools[langId],
                 tool => tool.isCompilerExcluded(compilerName, props)),
             unwiseOptions: props('unwiseOptions', '').split('|'),
             hidden: props('hidden', false),
             buildenvsetup: {
                 id: props('buildenvsetup', ''),
                 props: (name, def) => {
                     return props(`buildenvsetup.${name}`, def);
                 },
             },
         };

         if (props('demanglerClassFile') !== undefined) {
             logger.error(`Error in compiler.${compilerName}: ` +
                 'demanglerClassFile is no longer supported, please use demanglerType');
             return [];
         }

         if (process.platform === 'win32') {
             compilerInfo.libPath = compilerInfo.libPath.split(';').filter((p) => p !== '');
         } else {
             compilerInfo.libPath = compilerInfo.libPath.split(':').filter((p) => p !== '');
         }

         logger.debug('Found compiler', compilerInfo);
         return compilerInfo;
     }

     getSupportedLibrariesArr(props) {
         return _.filter(props('supportsLibraries', '').split(':'), (a) => a !== '');
     }

     async recurseGetCompilers(langId, compilerName, parentProps) {
         // Don't treat @ in paths as remote addresses if requested
         if (this.args.fetchCompilersFromRemote && compilerName.includes('@')) {
             const bits = compilerName.split('@');
             const host = bits[0];
             const pathParts = bits[1].split('/');
             const port = parseInt(pathParts.shift());
             const path = pathParts.join('/');
             return this.fetchRemote(host, port, path, this.ceProps, langId);
         }
         if (compilerName.indexOf('&') === 0) {
             const groupName = compilerName.substr(1);

             const props = (langId, name, def) => {
                 if (name === 'group') {
                     return groupName;
                 }
                 return this.compilerProps(langId, `group.${groupName}.${name}`, parentProps(langId, name, def));
             };
             const exes = _.compact(this.compilerProps(langId, `group.${groupName}.compilers`, '').split(':'));
             logger.debug(`Processing compilers from group ${groupName}`);
             return Promise.all(exes.map(compiler => this.recurseGetCompilers(langId, compiler, props)));
         }
         if (compilerName === 'AWS') return this.fetchAws();
         return this.compilerConfigFor(langId, compilerName, parentProps);
     }

     async getCompilers() {
         const compilers = [];
         _.each(this.getExes(), (exs, langId) => {
             _.each(exs, exe => compilers.push(this.recurseGetCompilers(langId, exe, this.compilerProps)));
         });
         return Promise.all(compilers);
     }

     ensureDistinct(compilers) {
         const ids = {};
         let foundClash = false;
         _.each(compilers, compiler => {
             if (!ids[compiler.id]) ids[compiler.id] = [];
             ids[compiler.id].push(compiler);
         });
         _.each(ids, (list, id) => {
             if (list.length !== 1) {
                 foundClash = true;
                 logger.error(`Compiler ID clash for '${id}' - used by ${
                     _.map(list, o => `lang:${o.lang} name:${o.name}`).join(', ')}`);
             }
         });
         return {compilers, foundClash};
     }

     async retryPromise(promiseFunc, name, maxFails, retryMs) {
         for (let fails = 0; fails < maxFails; ++fails) {
             try {
                 return await promiseFunc();
             } catch (e) {
                 if (fails < (maxFails - 1)) {
                     logger.warn(`Failed ${name} : ${e}, retrying`);
                     await sleep(retryMs);
                 } else {
                     logger.error(`Too many retries for ${name} : ${e}`);
                     throw e;
                 }
             }
         }
     }

     getExes() {
         const langToCompilers = this.compilerProps(this.languages, 'compilers', '', exs => _.compact(exs.split(':')));
         this.addNdkExes(langToCompilers);
         logger.info('Exes found:', langToCompilers);
         return langToCompilers;
     }

     addNdkExes(langToCompilers) {
         const ndkPaths = this.compilerProps(this.languages, 'androidNdk');
         _.each(ndkPaths, (ndkPath, langId) => {
             if (ndkPath) {
                 const toolchains = fs.readdirSync(`${ndkPath}/toolchains`);
                 for (const [version, index] of toolchains) {
                     const path = `${ndkPath}/toolchains/${version}/prebuilt/linux-x86_64/bin/`;
                     if (fs.existsSync(path)) {
                         const cc = fs.readdirSync(path).find(filename => filename.includes('g++'));
                         toolchains[index] = path + cc;
                     } else {
                         toolchains[index] = null;
                     }
                 }
                 langToCompilers[langId].push(toolchains.filter(x => x !== null));
             }
         });
     }

     async find() {
         let compilers = (await this.getCompilers()).flat(Infinity);
         compilers = await this.compileHandler.setCompilers(compilers, this.optionsHandler.get());
         const result = this.ensureDistinct(_.compact(compilers));
         return {foundClash: result.foundClash, compilers: _.sortBy(result.compilers, 'name')};
     }

     async loadPrediscovered(compilers) {
         for (const compiler of compilers) {
             const langId = compiler.lang;

             if (compiler.buildenvsetup) {
                 compiler.buildenvsetup.props = (propName, def) => {
                     return this.compilerProps(langId, 'buildenvsetup.' + propName, def);
                 };
             }

             const fullOptions = this.optionsHandler.get();

             compiler.tools = _.omit(
                 fullOptions.tools[langId],
                 tool => tool.isCompilerExcluded(compiler.id, (propName, def) => {
                     let val = this.compilerProps(langId, `compiler.${compiler.id}.${propName}`);
                     if (!val) {
                         if (compiler.group) {
                             val = this.compilerProps(langId, `group.${compiler.group}.${propName}`);
                             if (!val) return def;
                         }
                     }
                     return val;
                 }));
         }
         return this.compileHandler.setCompilers(compilers, this.optionsHandler.get());
     }
 }
	// Copyright (c) 2018, Compiler Explorer Authors
	// All rights reserved.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// * Redistributions of source code must retain the above copyright notice,
	// this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in the
	// documentation and/or other materials provided with the distribution.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	// POSSIBILITY OF SUCH DAMAGE.

	import http from 'http';
	import https from 'https';
	import path from 'path';
	import { promisify } from 'util';

	import fs from 'fs-extra';
	import _ from 'underscore';
	import urljoin from 'url-join';

	import { InstanceFetcher } from './aws';
	import { logger } from './logger';

	const sleep = promisify(setTimeout);

	/***
	* Finds and initializes the compilers stored on the properties files
	*/
	export class CompilerFinder {
	/***
	* @param {CompileHandler} compileHandler
	* @param {CompilerProps} compilerProps
	* @param {propsFor} awsProps
	* @param {Object} args
	* @param {Object} optionsHandler
	*/
	constructor(compileHandler, compilerProps, awsProps, args, optionsHandler) {
	this.compilerProps = compilerProps.get.bind(compilerProps);
	this.ceProps = compilerProps.ceProps;
	this.awsProps = awsProps;
	this.args = args;
	this.compileHandler = compileHandler;
	this.languages = compilerProps.languages;
	this.awsPoller = null;
	this.optionsHandler = optionsHandler;
	}

	awsInstances() {
	if (!this.awsPoller) this.awsPoller = new InstanceFetcher(this.awsProps);
	return this.awsPoller.getInstances();
	}

	async fetchRemote(host, port, uriBase, props, langId) {
	const requestLib = port === 443 ? https : http;
	const uriSchema = port === 443 ? 'https' : 'http';
	const uri = urljoin(`${uriSchema}://${host}:${port}`, uriBase);
	const apiPath = urljoin('/', uriBase \|\| '', 'api/compilers', langId \|\| '', '?fields=all');
	logger.info(`Fetching compilers from remote source ${uri}`);
	return this.retryPromise(
	() => {
	return new Promise((resolve, reject) => {
	const request = requestLib.get({
	hostname: host,
	port: port,
	path: apiPath,
	headers: {
	Accept: 'application/json',
	},
	}, res => {
	let error;
	const {statusCode, headers: {'content-type': contentType}} = res;

	if (statusCode !== 200) {
	error = new Error('Failed fetching remote compilers from ' +
	`${uriSchema}://${host}:${port}${apiPath}\n` +
	`Status Code: ${statusCode}`);
	} else if (!/^application\/json/.test(contentType)) {
	error = new Error('Invalid content-type.\n' +
	`Expected application/json but received ${contentType}`);
	}
	if (error) {
	logger.error(error.message);
	// consume response data to free up memory
	res.resume();
	reject(error);
	return;
	}
	let str = '';
	res.on('data', chunk => {
	str += chunk;
	});
	res.on('end', () => {
	try {
	const compilers = JSON.parse(str).map(compiler => {
	// Fix up old upstream implementations of Compiler Explorer
	// e.g. https://www.godbolt.ms
	// (see https://github.com/compiler-explorer/compiler-explorer/issues/1768)
	if (!compiler.alias) compiler.alias = [];
	if (typeof compiler.alias == 'string') compiler.alias = [compiler.alias];
	// End fixup
	compiler.exe = null;
	compiler.remote = {
	target: `${uriSchema}://${host}:${port}`,
	path: urljoin('/', uriBase, 'api/compiler', compiler.id, 'compile'),
	};
	return compiler;
	});
	resolve(compilers);
	} catch (e) {
	logger.error(`Error parsing response from ${uri} '${str}': ${e.message}`);
	reject(e);
	}
	});
	})
	.on('error', reject)
	.on('timeout', () => reject('timeout'));
	request.setTimeout(this.awsProps('proxyTimeout', 1000));
	});
	},
	`${host}:${port}`,
	props('proxyRetries', 5),
	props('proxyRetryMs', 500),
	).catch(() => {
	logger.warn(`Unable to contact ${host}:${port}; skipping`);
	return [];
	});
	}

	async fetchAws() {
	logger.info('Fetching instances from AWS');
	const instances = await this.awsInstances();
	return Promise.all(instances.map(instance => {
	logger.info('Checking instance ' + instance.InstanceId);
	const address = this.awsProps('externalTestMode', false) ? instance.PublicDnsName : instance.PrivateDnsName;
	return this.fetchRemote(address, this.args.port, '', this.awsProps, null);
	}));
	}

	async compilerConfigFor(langId, compilerName, parentProps) {
	const base = `compiler.${compilerName}.`;

	function props(propName, def) {
	const propsForCompiler = parentProps(langId, base + propName);
	if (propsForCompiler !== undefined) return propsForCompiler;
	return parentProps(langId, propName, def);
	}

	const ceToolsPath = props('ceToolsPath', './');

	const supportsBinary = !!props('supportsBinary', true);
	const interpreted = !!props('interpreted', false);
	const supportsExecute = (interpreted \|\| supportsBinary) && !!props('supportsExecute', true);
	const executionWrapper = props('executionWrapper', '');
	const supportsLibraryCodeFilter = !!props('supportsLibraryCodeFilter', true);

	const group = props('group', '');

	const demanglerProp = props('demangler', '');
	const demangler = demanglerProp ? path.normalize(demanglerProp.replace('${ceToolsPath}', ceToolsPath)) : '';

	const isSemVer = props('isSemVer', false);
	const baseName = props('baseName', null);
	const semverVer = props('semver', '');

	const name = props('name', compilerName);

	const baseOptions = props('baseOptions', '');
	const options = props('options', '');
	const actualOptions = _.compact([baseOptions, options]).join(' ');

	const envVars = (() => {
	const envVarsString = props('envVars', '');
	if (envVarsString === '') {
	return [];
	}
	const arr = [];
	for (const el of envVarsString.split(':')) {
	const [env, setting] = el.split('=');
	arr.push([env, setting]);
	}
	return arr;
	})();
	const exe = props('exe', compilerName);
	const exePath = path.dirname(exe);
	const compilerInfo = {
	id: compilerName,
	exe: exe,
	name: isSemVer && baseName ? `${baseName} ${semverVer}` : name,
	alias: _.filter(props('alias', '').split(':'), (a) => a !== ''),
	options: actualOptions,
	versionFlag: props('versionFlag'),
	versionRe: props('versionRe'),
	explicitVersion: props('explicitVersion'),
	compilerType: props('compilerType', ''),
	demangler: demangler,
	demanglerType: props('demanglerType', ''),
	objdumper: props('objdumper', ''),
	objdumperType: props('objdumperType', ''),
	intelAsm: props('intelAsm', ''),
	instructionSet: props('instructionSet', ''),
	needsMulti: !!props('needsMulti', true),
	supportsDemangle: !!demangler,
	supportsBinary,
	interpreted,
	supportsExecute,
	executionWrapper,
	supportsLibraryCodeFilter: supportsLibraryCodeFilter,
	postProcess: props('postProcess', '').split('\|'),
	lang: langId,
	group: group,
	groupName: props('groupName', ''),
	includeFlag: props('includeFlag', '-isystem'),
	includePath: props('includePath', ''),
	linkFlag: props('linkFlag', '-l'),
	rpathFlag: props('rpathFlag', '-Wl,-rpath,'),
	libpathFlag: props('libpathFlag', '-L'),
	libPath: props('libPath', ''),
	ldPath: props('ldPath', '')
	.split('\|')
	.map(x => path.normalize(x.replace('${exePath}', exePath))),
	envVars: envVars,
	notification: props('notification', ''),
	isSemVer: isSemVer,
	semver: semverVer,
	libsArr: this.getSupportedLibrariesArr(props, langId),
	tools: _.omit(
	this.optionsHandler.get().tools[langId],
	tool => tool.isCompilerExcluded(compilerName, props)),
	unwiseOptions: props('unwiseOptions', '').split('\|'),
	hidden: props('hidden', false),
	buildenvsetup: {
	id: props('buildenvsetup', ''),
	props: (name, def) => {
	return props(`buildenvsetup.${name}`, def);
	},
	},
	};

	if (props('demanglerClassFile') !== undefined) {
	logger.error(`Error in compiler.${compilerName}: ` +
	'demanglerClassFile is no longer supported, please use demanglerType');
	return [];
	}

	if (process.platform === 'win32') {
	compilerInfo.libPath = compilerInfo.libPath.split(';').filter((p) => p !== '');
	} else {
	compilerInfo.libPath = compilerInfo.libPath.split(':').filter((p) => p !== '');
	}

	logger.debug('Found compiler', compilerInfo);
	return compilerInfo;
	}

	getSupportedLibrariesArr(props) {
	return _.filter(props('supportsLibraries', '').split(':'), (a) => a !== '');
	}

	async recurseGetCompilers(langId, compilerName, parentProps) {
	// Don't treat @ in paths as remote addresses if requested
	if (this.args.fetchCompilersFromRemote && compilerName.includes('@')) {
	const bits = compilerName.split('@');
	const host = bits[0];
	const pathParts = bits[1].split('/');
	const port = parseInt(pathParts.shift());
	const path = pathParts.join('/');
	return this.fetchRemote(host, port, path, this.ceProps, langId);
	}
	if (compilerName.indexOf('&') === 0) {
	const groupName = compilerName.substr(1);

	const props = (langId, name, def) => {
	if (name === 'group') {
	return groupName;
	}
	return this.compilerProps(langId, `group.${groupName}.${name}`, parentProps(langId, name, def));
	};
	const exes = _.compact(this.compilerProps(langId, `group.${groupName}.compilers`, '').split(':'));
	logger.debug(`Processing compilers from group ${groupName}`);
	return Promise.all(exes.map(compiler => this.recurseGetCompilers(langId, compiler, props)));
	}
	if (compilerName === 'AWS') return this.fetchAws();
	return this.compilerConfigFor(langId, compilerName, parentProps);
	}

	async getCompilers() {
	const compilers = [];
	_.each(this.getExes(), (exs, langId) => {
	_.each(exs, exe => compilers.push(this.recurseGetCompilers(langId, exe, this.compilerProps)));
	});
	return Promise.all(compilers);
	}

	ensureDistinct(compilers) {
	const ids = {};
	let foundClash = false;
	_.each(compilers, compiler => {
	if (!ids[compiler.id]) ids[compiler.id] = [];
	ids[compiler.id].push(compiler);
	});
	_.each(ids, (list, id) => {
	if (list.length !== 1) {
	foundClash = true;
	logger.error(`Compiler ID clash for '${id}' - used by ${
	_.map(list, o => `lang:${o.lang} name:${o.name}`).join(', ')}`);
	}
	});
	return {compilers, foundClash};
	}

	async retryPromise(promiseFunc, name, maxFails, retryMs) {
	for (let fails = 0; fails < maxFails; ++fails) {
	try {
	return await promiseFunc();
	} catch (e) {
	if (fails < (maxFails - 1)) {
	logger.warn(`Failed ${name} : ${e}, retrying`);
	await sleep(retryMs);
	} else {
	logger.error(`Too many retries for ${name} : ${e}`);
	throw e;
	}
	}
	}
	}

	getExes() {
	const langToCompilers = this.compilerProps(this.languages, 'compilers', '', exs => _.compact(exs.split(':')));
	this.addNdkExes(langToCompilers);
	logger.info('Exes found:', langToCompilers);
	return langToCompilers;
	}

	addNdkExes(langToCompilers) {
	const ndkPaths = this.compilerProps(this.languages, 'androidNdk');
	_.each(ndkPaths, (ndkPath, langId) => {
	if (ndkPath) {
	const toolchains = fs.readdirSync(`${ndkPath}/toolchains`);
	for (const [version, index] of toolchains) {
	const path = `${ndkPath}/toolchains/${version}/prebuilt/linux-x86_64/bin/`;
	if (fs.existsSync(path)) {
	const cc = fs.readdirSync(path).find(filename => filename.includes('g++'));
	toolchains[index] = path + cc;
	} else {
	toolchains[index] = null;
	}
	}
	langToCompilers[langId].push(toolchains.filter(x => x !== null));
	}
	});
	}

	async find() {
	let compilers = (await this.getCompilers()).flat(Infinity);
	compilers = await this.compileHandler.setCompilers(compilers, this.optionsHandler.get());
	const result = this.ensureDistinct(_.compact(compilers));
	return {foundClash: result.foundClash, compilers: _.sortBy(result.compilers, 'name')};
	}

	async loadPrediscovered(compilers) {
	for (const compiler of compilers) {
	const langId = compiler.lang;

	if (compiler.buildenvsetup) {
	compiler.buildenvsetup.props = (propName, def) => {
	return this.compilerProps(langId, 'buildenvsetup.' + propName, def);
	};
	}

	const fullOptions = this.optionsHandler.get();

	compiler.tools = _.omit(
	fullOptions.tools[langId],
	tool => tool.isCompilerExcluded(compiler.id, (propName, def) => {
	let val = this.compilerProps(langId, `compiler.${compiler.id}.${propName}`);
	if (!val) {
	if (compiler.group) {
	val = this.compilerProps(langId, `group.${compiler.group}.${propName}`);
	if (!val) return def;
	}
	}
	return val;
	}));
	}
	return this.compileHandler.setCompilers(compilers, this.optionsHandler.get());
	}
	}