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Ask questionsTests for platforms without fenv.h

I'm working on adding build and test support for m68k, which doesn't have a newlib sys/fenv.h header (and therefore no FE exception support). This works on newlib because all newlib tests check for the presence of FE_INVALID etc. I was wondering if this is the approach you would like to take on picolibc as well before I plow ahead, with the caveat that it will result in a lot of ifdefs in math_errhandling_tests.c.

picolibc/picolibc

Answer questions keith-packard

I think everything except that one test program should build without new ifdefs. I should have written the new test to run on machines without fenv.h, but I was focused on getting the fenv stuff working correctly. Feel free to hack up that test to make it build for you.

useful!

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