iOS xCode5 Unsupported compiler 'com.apple.compilers.llvmgcc42' error when compiler set to LLVM 5.0

ios6 ios7 xcode5 llvm-gcc llvm5
Alex Stone picture Alex Stone · Feb 12, 2014 · Viewed 9.2k times · Source

I'm trying to open one of my older projects, that was built using iOS 6.0. The project used to compile fine, but when opened under xCode 5, I get this cryptic error message.

Unsupported compiler 'com.apple.compilers.llvmgcc42' selected for architecture 'armv7'
Unable to determine concrete GCC compiler for file /Users/alexanderstone/Desktop/Development/RestKit/Vendor/NXJSON/NSError+Extensions.m of type sourcecode.c.objc.
Unable to determine concrete GCC compiler for file /Users/alexanderstone/Desktop/Development/RestKit/Vendor/NXJSON/NXDebug.m of type sourcecode.c.objc.
Unable to determine concrete GCC compiler for file /Users/alexanderstone/Desktop/Development/RestKit/Vendor/NXJSON/NXJsonParser.m of type sourcecode.c.objc.
Unable to determine concrete GCC compiler for file /Users/alexanderstone/Desktop/Development/RestKit/Vendor/NXJSON/NXJsonSerializer.m of type sourcecode.c.objc.

I've checked both project build settings, and they appear correct - LLVM 5.0 is selected as compiler for both.

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Additionally, I checked the .m files that compiler complains about, and do not see any reference to GCC there. There are some ASSERT() and other macros, but I don't know if they are compiler-specific.

How can I resolve the llvmgcc4.2 compiler missing in xCode 5, when all subprojects appear to be set to llvm5.0?

Answer

Alex Stone picture Alex Stone · Feb 14, 2014

Found this similar question. For me the solution was to go to Editor>Validate Project settings for both the child and the Restkit projects.

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