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conditionals for platform-specific MAKE_ENV options
I am trying to make a package that has the following notes about compiling:
- If you see compilation errors, try make sse2only=1 to disable SSE4 code.
- It also works with ARM CPUs supporting the NEON instruction sets. To compile for 32 bit ARM architectures (such as ARMv7), use make arm_neon=1. To compile for for 64 bit ARM architectures (such as ARMv8), use make arm_neon=1 aarch64=1.
I am assuming that I should include a conditional based upon MACHINE_PLATFORM to set MAKE_ENV so that (at least some of) these cases are handled. However, I am not sure what the conditional should be. Thus, I have several questions.
- I know that SSE4 was introduced a long time ago, but are there any relevant platforms that should still use the sse2only=1 option?
- What is the best way to handle conditionals for the two ARM architectures mentioned above?
Thanks for your help.
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