pmt: revert 7f8090b

include/libgnulib/fpe-trapping.h

@@ -1,53 +0,0 @@
-/* Trapping floating-point exceptions.
-   Copyright (C) 2023-2024 Free Software Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
-
-/* HAVE_FPE_TRAPPING
-   Defined to 1 when sigfpe_on_invalid is available.  */
-
-/* sigfpe_on_invalid
-   Enables a SIGFPE signal when an FE_INVALID exception occurs.
-   A SIGFPE signal by default terminates the program.
-   Returns >= 0 when successful, -1 upon failure.  */
-
-
-#include <fenv.h>
-
-static int
-sigfpe_on_invalid ()
-{
-  /* Clear FE_INVALID exceptions from past operations.  */
-  feclearexcept (FE_INVALID);
-
-  /* An FE_INVALID exception shall trigger a SIGFPE signal.
-     This call may fail on arm, arm64, riscv64 CPUs.
-     Also, possibly a bug in glibc/sysdeps/m68k/fpu/feenablxcpt.c: it sets
-     only bit 13, but should better set bits 15, 14, 13 of the control
-     register together.  See
-     <https://sourceware.org/bugzilla/show_bug.cgi?id=30993>.  */
-  int ret = feenableexcept (FE_INVALID);
-  if (ret == -1)
-    return -1;
-
-  return 0;
-}
-
-/* But it does not work on RISC-V.  That's because the fcsr register has only
-   bits for floating-point exception status, but no bits for trapping
-   floating-point exceptions.  */
-/* And it does not work on arm with software floating-point emulation.  */
-#if !(defined __riscv || (defined __GLIBC__ && defined __arm__ && defined __SOFTFP__))
-# define HAVE_FPE_TRAPPING 1
-#endif