Compile libraries needed for Crystal on Windows

libraries.ps1

.\vs_buildtools.exe --passive --norestart --wait --add Microsoft.VisualStudio.Workload.VCTools --includeRecommended | Out-Default

$script = @'
$installdir = "$pwd"

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

echo "Downloading cmake"
iwr https://cmake.org/files/v3.11/cmake-3.11.4-win64-x64.zip -OutFile cmake.zip
Expand-Archive cmake.zip -DestinationPath .
rm cmake.zip

$cmake = "$installdir\cmake-3.11.4-win64-x64\bin\cmake.exe"

echo "Downloading PCRE"
iwr https://ftp.pcre.org/pub/pcre/pcre-8.42.zip -OutFile pcre.zip
Expand-Archive pcre.zip -DestinationPath .
rm pcre.zip

echo "Building PCRE"
mkdir pcre-8.42\build
cd pcre-8.42\build

& $cmake .. -G "Visual Studio 15 2017 Win64" -DBUILD_SHARED_LIBS=OFF -DPCRE_SUPPORT_UNICODE_PROPERTIES=ON -DPCRE_SUPPORT_JIT=ON -DPCRE_STATIC_RUNTIME=ON | Out-Default
& $cmake --build . --config release | Out-Default
mv release\pcre.lib $installdir\pcre.lib

cd $installdir

echo "Downloading libgc"
iwr https://github.com/ivmai/bdwgc/archive/v7.6.6.zip -OutFile bdwgc.zip
Expand-Archive bdwgc.zip -DestinationPath .
rm bdwgc.zip

echo "Downloading libatomic_ops"
iwr https://github.com/ivmai/libatomic_ops/archive/v7.6.4.zip -OutFile libatomic_ops.zip
Expand-Archive libatomic_ops.zip -DestinationPath .
rm libatomic_ops.zip
mv libatomic_ops-7.6.4 bdwgc-7.6.6\libatomic_ops

echo "Downloading win32.mak"
iwr https://gist.github.com/ynkdir/688e62f419e5374347bf/raw/d250598ddf5129addd212b8390279a01bca12706/win32.mak -OutFile bdwgc-7.6.6\ntwin32.mak

echo "Building libgc"
cd bdwgc-7.6.6

nmake -f NT_X64_STATIC_THREADS_MAKEFILE nodebug=1 _CL_=-DDONT_USE_USER32_DLL | Out-Default
mv gc.lib $installdir\gc.lib
'@

$script | cmd /S /C 'C:\Program^ Files^ ^(x86^)\Microsoft^ Visual^ Studio\2017\BuildTools\VC\Auxiliary\Build\vcvarsall.bat x64 && powershell -Command -'

Folder is now 2019, not 2017

I updated cmake & pcre as well as the references of 2017 to 2019 to be usable

.\vs_buildtools.exe --passive --norestart --wait --add Microsoft.VisualStudio.Workload.VCTools --includeRecommended | Out-Default

$script = @'
$installdir = "$pwd"

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

echo "Downloading cmake"
iwr https://cmake.org/files/v3.16/cmake-3.16.4-win64-x64.zip -OutFile cmake.zip
Expand-Archive cmake.zip -DestinationPath .
rm cmake.zip

$cmake = "$installdir\cmake-3.16.4-win64-x64\bin\cmake.exe"

echo "Downloading PCRE"
iwr https://ftp.pcre.org/pub/pcre/pcre-8.44.zip -OutFile pcre.zip
Expand-Archive pcre.zip -DestinationPath .
rm pcre.zip

echo "Building PCRE"
mkdir pcre-8.44\build
cd pcre-8.44\build

& $cmake .. -G "Visual Studio 16 2019" -A x64 -DBUILD_SHARED_LIBS=OFF -DPCRE_SUPPORT_UNICODE_PROPERTIES=ON -DPCRE_SUPPORT_JIT=ON -DPCRE_STATIC_RUNTIME=ON | Out-Default
& $cmake --build . --config release | Out-Default
mv release\pcre.lib $installdir\pcre.lib

cd $installdir

echo "Downloading libgc"
iwr https://github.com/ivmai/bdwgc/archive/v7.6.6.zip -OutFile bdwgc.zip
Expand-Archive bdwgc.zip -DestinationPath .
rm bdwgc.zip

echo "Downloading libatomic_ops"
iwr https://github.com/ivmai/libatomic_ops/archive/v7.6.4.zip -OutFile libatomic_ops.zip
Expand-Archive libatomic_ops.zip -DestinationPath .
rm libatomic_ops.zip
mv libatomic_ops-7.6.4 bdwgc-7.6.6\libatomic_ops

echo "Downloading win32.mak"
iwr https://gist.github.com/ynkdir/688e62f419e5374347bf/raw/d250598ddf5129addd212b8390279a01bca12706/win32.mak -OutFile bdwgc-7.6.6\ntwin32.mak

echo "Building libgc"
cd bdwgc-7.6.6

nmake -f NT_X64_STATIC_THREADS_MAKEFILE nodebug=1 _CL_=-DDONT_USE_USER32_DLL | Out-Default
mv gc.lib $installdir\gc.lib
'@

$script | cmd /S /C 'C:\Program^ Files^ ^(x86^)\Microsoft^ Visual^ Studio\2019\BuildTools\VC\Auxiliary\Build\vcvarsall.bat x64 && powershell -Command -'

@Daniel-Worrall, guaranteed working instructions will always be at https://github.com/crystal-lang/crystal/blob/master/.github/workflows/win.yml