Hi,
When I'm running sparse on my NiosII Linux build, I'm seeing many errors
concerning an undefined identifier which is actually a GCC built-in for
the NiosII architecture [1].
./arch/nios2/include/asm/irqflags.h:25:16: error: undefined identifier
'__builtin_rdctl'
./arch/nios2/include/asm/irqflags.h:25:16: error: not a function <noident>
./arch/nios2/include/asm/irqflags.h:34:9: error: undefined identifier
'__builtin_wrctl'
./arch/nios2/include/asm/irqflags.h:34:9: error: not a function <noident>
Googling this error led me to 2 possible solutions.
1. Comment it out in the Linux source [2].
2. Additions in the sparse lib.c file [3].
#2 was accepted but that built-in seems to be generic for all
architectures. In my case, this is only for the GCC compiler for NiosII.
What is the best way to handle a built-in for a specific architecture?
Thanks,
Thor
Links:
[1]
https://gcc.gnu.org/onlinedocs/gcc/Altera-Nios-II-Built-in-Functions.html
[2] https://lkml.org/lkml/2015/6/15/616
[3] http://comments.gmane.org/gmane.comp.parsers.sparse/3402
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