daemon-m40/src/main/java/org/apache/maven/cli/DaemonMavenCli.java [999:1065]:
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    void toolchains(CliRequest cliRequest) throws Exception {
        File userToolchainsFile;

        if (cliRequest.commandLine.hasOption(CLIManager.ALTERNATE_USER_TOOLCHAINS)) {
            userToolchainsFile = new File(cliRequest.commandLine.getOptionValue(CLIManager.ALTERNATE_USER_TOOLCHAINS));
            userToolchainsFile = resolveFile(userToolchainsFile, cliRequest.workingDirectory);

            if (!userToolchainsFile.isFile()) {
                throw new FileNotFoundException(
                        "The specified user toolchains file does not exist: " + userToolchainsFile);
            }
        } else {
            userToolchainsFile = DEFAULT_USER_TOOLCHAINS_FILE;
        }

        File globalToolchainsFile;

        if (cliRequest.commandLine.hasOption(CLIManager.ALTERNATE_GLOBAL_TOOLCHAINS)) {
            globalToolchainsFile =
                    new File(cliRequest.commandLine.getOptionValue(CLIManager.ALTERNATE_GLOBAL_TOOLCHAINS));
            globalToolchainsFile = resolveFile(globalToolchainsFile, cliRequest.workingDirectory);

            if (!globalToolchainsFile.isFile()) {
                throw new FileNotFoundException(
                        "The specified global toolchains file does not exist: " + globalToolchainsFile);
            }
        } else {
            globalToolchainsFile = DEFAULT_GLOBAL_TOOLCHAINS_FILE;
        }

        cliRequest.request.setGlobalToolchainsFile(globalToolchainsFile);
        cliRequest.request.setUserToolchainsFile(userToolchainsFile);

        DefaultToolchainsBuildingRequest toolchainsRequest = new DefaultToolchainsBuildingRequest();
        if (globalToolchainsFile.isFile()) {
            toolchainsRequest.setGlobalToolchainsSource(new FileSource(globalToolchainsFile));
        }
        if (userToolchainsFile.isFile()) {
            toolchainsRequest.setUserToolchainsSource(new FileSource(userToolchainsFile));
        }

        eventSpyDispatcher.onEvent(toolchainsRequest);

        slf4jLogger.debug(
                "Reading global toolchains from {}",
                getLocation(toolchainsRequest.getGlobalToolchainsSource(), globalToolchainsFile));
        slf4jLogger.debug(
                "Reading user toolchains from {}",
                getLocation(toolchainsRequest.getUserToolchainsSource(), userToolchainsFile));

        ToolchainsBuildingResult toolchainsResult = toolchainsBuilder.build(toolchainsRequest);

        eventSpyDispatcher.onEvent(toolchainsResult);

        executionRequestPopulator.populateFromToolchains(cliRequest.request, toolchainsResult.getEffectiveToolchains());

        if (!toolchainsResult.getProblems().isEmpty() && slf4jLogger.isWarnEnabled()) {
            slf4jLogger.warn("");
            slf4jLogger.warn("Some problems were encountered while building the effective toolchains");

            for (Problem problem : toolchainsResult.getProblems()) {
                slf4jLogger.warn("{} @ {}", problem.getMessage(), problem.getLocation());
            }

            slf4jLogger.warn("");
        }
    }
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daemon-m39/src/main/java/org/apache/maven/cli/DaemonMavenCli.java [938:1004]:
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    void toolchains(CliRequest cliRequest) throws Exception {
        File userToolchainsFile;

        if (cliRequest.commandLine.hasOption(CLIManager.ALTERNATE_USER_TOOLCHAINS)) {
            userToolchainsFile = new File(cliRequest.commandLine.getOptionValue(CLIManager.ALTERNATE_USER_TOOLCHAINS));
            userToolchainsFile = resolveFile(userToolchainsFile, cliRequest.workingDirectory);

            if (!userToolchainsFile.isFile()) {
                throw new FileNotFoundException(
                        "The specified user toolchains file does not exist: " + userToolchainsFile);
            }
        } else {
            userToolchainsFile = DEFAULT_USER_TOOLCHAINS_FILE;
        }

        File globalToolchainsFile;

        if (cliRequest.commandLine.hasOption(CLIManager.ALTERNATE_GLOBAL_TOOLCHAINS)) {
            globalToolchainsFile =
                    new File(cliRequest.commandLine.getOptionValue(CLIManager.ALTERNATE_GLOBAL_TOOLCHAINS));
            globalToolchainsFile = resolveFile(globalToolchainsFile, cliRequest.workingDirectory);

            if (!globalToolchainsFile.isFile()) {
                throw new FileNotFoundException(
                        "The specified global toolchains file does not exist: " + globalToolchainsFile);
            }
        } else {
            globalToolchainsFile = DEFAULT_GLOBAL_TOOLCHAINS_FILE;
        }

        cliRequest.request.setGlobalToolchainsFile(globalToolchainsFile);
        cliRequest.request.setUserToolchainsFile(userToolchainsFile);

        DefaultToolchainsBuildingRequest toolchainsRequest = new DefaultToolchainsBuildingRequest();
        if (globalToolchainsFile.isFile()) {
            toolchainsRequest.setGlobalToolchainsSource(new FileSource(globalToolchainsFile));
        }
        if (userToolchainsFile.isFile()) {
            toolchainsRequest.setUserToolchainsSource(new FileSource(userToolchainsFile));
        }

        eventSpyDispatcher.onEvent(toolchainsRequest);

        slf4jLogger.debug(
                "Reading global toolchains from {}",
                getLocation(toolchainsRequest.getGlobalToolchainsSource(), globalToolchainsFile));
        slf4jLogger.debug(
                "Reading user toolchains from {}",
                getLocation(toolchainsRequest.getUserToolchainsSource(), userToolchainsFile));

        ToolchainsBuildingResult toolchainsResult = toolchainsBuilder.build(toolchainsRequest);

        eventSpyDispatcher.onEvent(toolchainsResult);

        executionRequestPopulator.populateFromToolchains(cliRequest.request, toolchainsResult.getEffectiveToolchains());

        if (!toolchainsResult.getProblems().isEmpty() && slf4jLogger.isWarnEnabled()) {
            slf4jLogger.warn("");
            slf4jLogger.warn("Some problems were encountered while building the effective toolchains");

            for (Problem problem : toolchainsResult.getProblems()) {
                slf4jLogger.warn("{} @ {}", problem.getMessage(), problem.getLocation());
            }

            slf4jLogger.warn("");
        }
    }
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