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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96862] -frounding-math -std=c++2a error: '(1.29e+2 *
 6.9314718055994529e-1)' is not a constant expression
Date: Mon, 31 Aug 2020 14:29:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96862

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I don't know.
fold-const.c has:
#define START_FOLD_INIT \
  int saved_signaling_nans =3D flag_signaling_nans;\
  int saved_trapping_math =3D flag_trapping_math;\
  int saved_rounding_math =3D flag_rounding_math;\
  int saved_trapv =3D flag_trapv;\
  int saved_folding_initializer =3D folding_initializer;\
  flag_signaling_nans =3D 0;\
  flag_trapping_math =3D 0;\
  flag_rounding_math =3D 0;\
  flag_trapv =3D 0;\
  folding_initializer =3D 1;

#define END_FOLD_INIT \
  flag_signaling_nans =3D saved_signaling_nans;\
  flag_trapping_math =3D saved_trapping_math;\
  flag_rounding_math =3D saved_rounding_math;\
  flag_trapv =3D saved_trapv;\
  folding_initializer =3D saved_folding_initializer;=