[Bug c/114181] issubnormal is a macro

[g.peterhoff--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114181

--- Comment #3 from g.peterh...@t-online.de ---
Of course issubnormal is defined in math.h (in my case line 1088, gcc 13.2).