PowerShell script collection (built with Windows 10 and Linux (pengwin - Debian-based) in mind on PowerShell Core 7.0.0-preview.4

cpp_compile.ps1

#!/usr/bin/pwsh-preview
# Setting default values for some variables
$configVersion = ""
$preferredCompiler = ""
$cppStandard = ""
$additionalFlags = ""
$currentDir = (Get-Item -Path ".\").FullName
$configPath = "$currentDir/cpp_config.xml"
$PSVersion = "PowerShell " + $PSVersionTable.PSEdition + " version: " + $PSVersionTable.PSVersion

Out-Host -InputObject $PSVersion
Out-Host -InputObject "Attempting to read from cpp_config.xml file..."

# Could optimize by providing index of item
function WriteToXML($funcKey, $answer, $xml) {
    Out-Host -InputObject "Writing preferences to cpp_config.xml file..."
    for ($i = 0; $i -lt $xml.cppConfig.add.Count; $i++) {
        $xmlKey = $xml.cppConfig.add[$i].key
        if ($xmlKey -eq $funcKey)
        { $xml.cppConfig.add[$i].value = [string]$answer }
    }
    $xml.Save($configPath)
}

function CreateConfig() {
    Out-Host -InputObject "Failed to find an existing cpp_config.xml file..."
    Out-Host -InputObject "Generating a new cpp_config.xml file..."
    New-Item cpp_config.xml
    Set-Content $configPath '<?xml version="1.0" encoding="UTF-8"?>
<cppConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <add key="configVersion" value="1.0" />
    <add key="preferredCompiler" value="" />
    <add key="cppStandard" value="" />
    <add key="additionalFlags" value="" />
</cppConfig>'
}

$bool = Test-Path $configPath
if ($bool) {
    $xml = [xml](Get-Content $configPath)
}
else {
    CreateConfig
    break
}

if ($xml) {
    foreach ($item in $xml.cppConfig.add) {
        if ($item.key -eq "configVersion")
        { $configVersion = $item.value }
        if ($item.key -eq "preferredCompiler")
        { $preferredCompiler = $item.value }
        if ($item.key -eq "cppStandard")
        { $cppStandard = $item.value }
        if ($item.key -eq "additionalFlags")
        { $additionalFlags = $item.value }
    }
}

$configVersionStr = [string]$configVersion
if ($configVersionStr -eq "1.0") {
    Out-Host -InputObject "Config version 1.0 set."
}
else {
    Out-Host -InputObject "What config version are you using?"
    # WriteToXML
}

$preferredCompilerStr = [string]$preferredCompiler
if ($preferredCompilerStr -eq "") {
    $preferredCompiler = Read-Host 'What is your preferred C++ compiler? (g++, clang++, MSVC)'
    # TODO: Write to XML config
    WriteToXML "preferredCompiler" $preferredCompiler $xml
}

$cppStandardStr = [string]$cppStandard
if ($cppStandardStr -eq "") {
    $cppStandard = Read-Host 'What C++ standard will you be using? (C++98, 03, 11, 14, 17)'
    # TODO: Write to XML config
    WriteToXML "cppStandard" $cppStandard $xml
}

# $additionalFlagsStr = [string]$additionalFlags
# if ($additionalFlagsStr -eq "") {
#     $additionalFlags = Read-Host 'Please specify any additional flags here. (pipe delimited)'
#     Out-Host -InputObject $additionalFlags
#     # TODO: Write to XML config
#     WriteToXML "additionalFlags" $additionalFlags $xml
# }

function compile {
    $fileName = "test.cpp"
    $exeName = $fileName.Split(".")[0]
    Out-Host -InputObject "Compiling code..."
    # Check for OS (shouldn't be able to run msvc from Linux, etc.)
    if ($preferredCompiler -eq "g++" -or $preferredCompiler -eq "clang++") {
        $cppStd = "-std=$cppStandard"
        Out-Host -InputObject "G++ or Clang++"
        & $preferredCompiler $fileName -o $exeName $cppStd $additionalFlags
    }
    elseif ($preferredCompiler -eq "msvc") {
        # cl /EHsc /O1 -std:c++17 test.cpp
        $preferredCompiler = "cl"
        $cppStd = "-std:$cppStandard"
        Out-Host -InputObject "MSVC"
        $compilerStatement = "$preferredCompiler /EHsc $fileName /out:$exeName.exe $cppStd $additionalFlags"
        Out-Host -InputObject $compilerStatement
        & $preferredCompiler /EHsc $fileName /Fe $exeName.exe $cppStd $additionalFlags
    }
}
compile