ARMCC: Mistakenly identified as GNU compiler

The ARMCC (ARM toolchain) support seems to be broken in CMake 3.13.4. The reason is probably that ARMCC generates the predefined marco __GNU__ and the CMakeCompilerIdDetection.cmake script recognizes ARMCC as a GNU Compiler.

changing Line 73:

   list(APPEND ordered_compilers
      SCO
      AppleClang
      Clang
      GNU
      MSVC
      ADSP
      IAR
      ARMCC
    )

   list(APPEND ordered_compilers
      SCO
      ARMCC
      AppleClang
      Clang
      GNU
      MSVC
      ADSP
      IAR
    )

in the Modules/CMakeCompilerIdDetection.cmake fixes the problem for me

Regards, Francois Lion

Edited Mar 20, 2019 by Brad King

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