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Let user override ENOKI_NATIVE_FLAGS and ENOKI_ARCH_FLAGS - #115

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mlamarre wants to merge 1 commit into
mitsuba-renderer:masterfrom
mlamarre:no_native_arch
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Let user override ENOKI_NATIVE_FLAGS and ENOKI_ARCH_FLAGS#115
mlamarre wants to merge 1 commit into
mitsuba-renderer:masterfrom
mlamarre:no_native_arch

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@mlamarre

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PR as a suggestion.
I got an illegal instruction signal (SIGILL) on import mitsuba when building on a different system with a more recent CPU than my own computer.
The cause is -march=native. I didn't find any way to override this flag without changing Enoki CMakeLists.txt.
I tried to change as little as possible code to allow overriding ENOKI_NATIVE_FLAGS and ENOKI_ARCH_FLAGS at the CMake command line to fix the SIGILL.

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