Tests fail to build with gcc-14 (-Werror=implicit-function-declaration)

[orlitzky]

With gcc-14, implicit function definitions have become an error by default. There are a few of these in the test suite:

/home/mjo/src/sleef.git/src/libm-tester/tester2simdsp.c: In function 'main':
/home/mjo/src/sleef.git/src/libm-tester/tester2simdsp.c:895:54: error: implicit declaration of function 'isinff' [-Wimplicit-function-declaration]
  895 |           (d >=  sqrt(FLT_MAX) && !(u0 <= 1.0001 || (isinff(t) && t > 0))) ||

/home/mjo/src/sleef.git/src/libm-tester/tester2ld.c: In function 'countULP':
/home/mjo/src/sleef.git/src/libm-tester/tester2ld.c:56:7: error: implicit declaration of function 'isnanl' [-Wimplicit-function-declaration]
   56 |   if (isnanl(c2) && isnanl(d)) return 0;

/home/mjo/src/sleef.git/src/libm-tester/tester2sp.c: In function 'main':
/home/mjo/src/sleef.git/src/libm-tester/tester2sp.c:657:54: error: implicit declaration of function 'isinff' [-Wimplicit-function-declaration]
  657 |           (d >=  sqrt(FLT_MAX) && !(u0 <= 1.0001 || (isinff(t) && t > 0))) ||

I copy/pasted some things to get it working, but usually the issue comes down to a missing #include.

[blapie]

Hello! Thanks for reporting the error. We can probably easily reproduce locally and surely fix these missing includes.

Btw Gcc 14 is not officially supported in SLEEF yet, so there might be other issues. It probably won't be tested (in CI) unless it can be apt installed from the distributions available via github-hosted runners.

[orlitzky]

No problem, both sleef-3.6.1 and gcc-14 are available in Gentoo so our users are testing it :)