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ccompilationembeddedxmos

xmos internal compiler error in llvmgen.c?

I ported some code that I wrote in C to XC and as a result this is what I got as my build output.

**** Build of configuration Debug for project camera_with_memory ****

xmake CONFIG=Debug all 
Creating dependencies for point.xc
Compiling point.xc
xcc1: internal compiler error
Failed in /build/swnb/autobuild/swview/MacOSX/build/sb/tools_xcc1_c_llvm/BackEnd/LLVM/llvmgen.c, line 9314
    isExpVar(d->components->u.dimension)
For bug reporting instructions, please see:
http://www.xmos.com/support
xmake[1]: *** [.build_Debug/src/point.xc.o] Error 1
xmake: *** [bin/Debug/camera_with_memory_Debug.xe] Error 2

What could cause this? I'm real puzzled. My C code is ~80 lines. Here is the declaration:

int sort_by_col(int center_points[num_points][2], static const unsigned int num_points, 
    int col_idx[col_idx_size], static const unsigned int col_idx_size);
Solution

  • This is a bug in the compiler. It seems that you cannot declare a multidimensional array whose first dimension is a static const variable e.g.

    void f(static const unsigned n) {
     unsigned a[n][2];
}

    This should be allowed. For future reference, since this compiler is maintained by XMOS, you can report a bug to them here:

    https://www.xmos.com/en/support/contact

    This bug is evident in version 13.0.2 of the XMOS compiler.

    Disclosure: I work for XMOS on the compiler, so will report this bug.