HELP .. Using obsolete custom response file 'mcs.rsp'. Please use 'csc.rsp' instead

[Mrlamb4u]

I am trying to make a build for Oculus Quest form a game I have tryed to make. But I keep getting the above error when I use te build and run command in , or just the build command … I found out through google that is refers to the used compiller. I saw that my unity uses mcs.rsp instead of csc.rsp … But I can’t find anywhere on the Internet , how to switch my unity tot scs.rsp … Is there anyone who had the same problem and willing to let me in on the secret?
Thanx in advance
Remco

[Joe-Censored]

You haven’t mentioned where these rsp files are coming from, what version of Unity you are using, what is giving you this error exactly, etc. But the below was the very first google result, and seems to explain pretty clearly under what settings does Unity need one or the other.

Unity - Manual: Conditional compilation

@Unity Manual

Global custom #defines
You can define your own preprocessor directives to control which code gets included when compiling. To do this you must add a text file with the extra directives to the Assets
folder. The name of the file depends on the language you are using. The extension is .rsp:

C# (player and editor scripts) /Assets/mcs.rsp
As an example, if you include the single line -define:UNITY_DEBUG in your mcs.rsp file, the #define directive UNITY_DEBUG exists as a global #define for C# scripts, except for Editor scripts.

Every time you make changes to .rsp files, you need to recompile in order for them to be effective. You can do this by updating or reimporting a single script (.js or .cs) file.

Note:If you want to modify only global #define directives, use Scripting Define Symbols in Player settings, because this covers all the compilers. If you choose the .rsp files instead, you need to provide one file for every compiler Unity uses.

The use of .rsp files is described in the ‘Help’ section of the mcs application, which is included in the Editor installation folder. You can get more information by running mcs -help.

Note that the .rsp file needs to match the compiler being invoked. For example:

• when targeting the .NET 3.5 Equivalent (deprecated) scripting runtime version, mcs is used with mcs.rsp, and
• when targeting the .NET 4.x Eqivalent scripting runtime version compiler, csc is used with csc.rsp.

[Mrlamb4u]

That part is also what I found , and I know Unity needs crc.rsp in my case. But in my Asset folder there is only mcs.rsp and I can not find the other one … Also I can not find it anywhere , as to how to change my version to the csc.rsp version … What ever I have tryed to change in the build settings , there is never a csc.rsp file in my asset folder , and thus the error keeps comming up when I try to build the APK for my Oculus. I am quit new to Unity (started in Dec last year) … Thanx for taking the time to help

[Joe-Censored]

@Mrlamb4u

But in my Asset folder there is only mcs.rsp and I can not find the other one

Why do you even add this file? It doesn’t come with a new project. You added it for some reason.

Figure out why you added it, and why you need it. If it came from some 3rd party asset then check if there is a newer version of the asset or support for updating it. Worst case you’ll need to figure out exactly what it does, and either rewrite it so it works for you, or design around it so you no longer need it.

[Mrlamb4u]

I found the solution , I just added a file called csc.rsp in the assets folder and copied the content from the mcs.rsp file into it and now I can build tha apk
Thanx for your time

[alexzzzz]

The .rsp file should match the C# compiler name. Unity had switched from Mono C# compiler (called “mcs.exe”) to the Microsoft’s one (called “csc.exe”) a while ago, so you could also just rename mcs.rsp to csc.rsp. There’s no point in keeping mcs.rsp in the project.