Pushed after testing on x86_64-unknown-linux-gnu. The macro may not be present in all libc's, but the built-in is always available. See https://gcc.gnu.org/pipermail/gcc-patches/2024-July/656409.html for context.
gcc/testsuite/ChangeLog:
* gfortran.dg/ieee/signaling_2.f90: Adjust test.
* gfortran.dg/ieee/signaling_2_c.c: Adjust test.
0001-Fortran-switch-test-to-use-issignaling-built-in.patch
Description: Binary data
