D8 invocation doesn't use response files

[jpobst]

If you reference enough of our library bindings NuGet packages, the command line to d8/java gets too long and throws an error:

Command 'build -c Release -bl' failed with exit code 1.
Errors:
MSB6003: The specified task executable "java.exe" could not be run. System.ComponentModel.Win32Exception (206): An error occurred trying to start process 'C:\Program Files (x86)\Android\openjdk\jdk-17.0.8.101-hotspot\bin\java.exe' with working directory 'D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest'. The filename or extension is too long. [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
MSB6003: at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo) [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
MSB6003: at Microsoft.Build.Utilities.ToolTask.StartToolProcess(Process proc) [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
MSB6003: at Microsoft.Build.Utilities.ToolTask.ExecuteTool(String pathToTool, String responseFileCommands, String commandLineCommands) [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
MSB6003: at Microsoft.Build.Utilities.ToolTask.Execute() [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
Warnings:
APT2000: warn: removing resource com.companyname.AllPackagesTest:string/action_bar_expand_collapse_button without required default value. [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
APT2000: warn: removing resource com.companyname.AllPackagesTest:string/action_bar_expand_collapse_button without required default value. [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]
MSB6002: The command-line for the "D8" task is too long. Command-lines longer than 32000 characters are likely to fail. Try reducing the length of the command-line by breaking down the call to "D8" into multiple calls with fewer parameters per call. [D:\a_work\1\s\output\tests\allpackages\android\AllPackagesTest\AllPackagesTest.csproj]

Does java support response files to get around this issue?

[jonpryor]

Yes, r8.jar supports response files:

% echo ' --help' > r.rsp
% java -jar /usr/local/share/dotnet/packs/Microsoft.Android.Sdk.Darwin/35.0.7/tools/r8.jar @r.rsp
…
  --startup-profile <file>
                          # Startup profile <file> to use for dex layout.
  --version               # Print the version of r8.
  --help                  # Print this message.

r8.jar @r.rsp whenr.rsp contains --help shows output equivalent to r8.jar --help.