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Diffstat (limited to 'REORG.TODO/bits/inf.h')
| -rw-r--r-- | REORG.TODO/bits/inf.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/REORG.TODO/bits/inf.h b/REORG.TODO/bits/inf.h new file mode 100644 index 0000000000..5c66ca33d5 --- /dev/null +++ b/REORG.TODO/bits/inf.h @@ -0,0 +1,32 @@ +/* Default `INFINITY' constant. + Copyright (C) 2004-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _MATH_H +# error "Never use <bits/inf.h> directly; include <math.h> instead." +#endif + +/* If we don't have real infinity, then we're supposed to produce a float + value that overflows at translation time, which is required to produce + a diagnostic. GCC's __builtin_inff produces a quite nice diagnostic + that tells the user that the target doesn't support infinities. */ + +#if __GNUC_PREREQ(3,3) +# define INFINITY (__builtin_inff()) +#else +# define INFINITY (1e9999f) +#endif |