ArmClang error (cannot specify -o)

Question

Hello, 
 I am trying to move from ARM Compiler v5.06 to v6.4, but I encounter an error, which I cannot handle. 
 The project builds fine with v5.06. When changing to v6.4 in Keil µVision and hitting build, the following error pops up for every source file in the project: 
 ArmClang.exe: error: cannot specify -o when generating multiple output files
 
 Looking at Project -> Options -> C/C++, I can see "-o" in compiler control string, but I can't do anything to make it disappear. 
 Any help would be appreciated.
Tamas

NewtoM · Accepted Answer

OK, 
 I dived a bit deeper into with what arguments µVision calls the ArmClang.exe. 
 I don't know why, but if the last specified include directory in µVision was "..\Modules" , then one of the arguments of ArmClang.exe became -main-file-name "Modules" , instead of -I "..\Modules" . I believe that this has lead to the error. 
 If I move the "..\Modules" in µVision's list of included directories more towards the beginning of the list, ArmClangs's argument becomes -main-file-name "myModesMode3.c" , which is correct in my case and the compilation goes on. 
 I can reproduce this behavior, but cannot explain it.
This may be a bug in the µVision IDE (v5.20.0.0).

ArmClang error (cannot specify -o)

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