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77 lines
2.4 KiB
Plaintext
77 lines
2.4 KiB
Plaintext
# minus-zero.m4 serial 2
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dnl Copyright (C) 2010-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Macros for floating-point negative zero.
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# Keep in sync with tests/minus-zero.h!
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# Expands to code that defines a variable or macro minus_zerof.
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AC_DEFUN([gl_FLOAT_MINUS_ZERO_CODE],
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[[
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#include <float.h>
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/* minus_zerof represents the value -0.0f. */
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/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
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ICC 10.0 has a bug when optimizing the expression -zero.
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The expression -FLT_MIN * FLT_MIN does not work when cross-compiling
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to PowerPC on Mac OS X 10.5. */
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#if defined __hpux || defined __sgi || defined __ICC
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static float
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compute_minus_zerof (void)
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{
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return -FLT_MIN * FLT_MIN;
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}
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# define minus_zerof compute_minus_zerof ()
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#else
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float minus_zerof = -0.0f;
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#endif
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]])
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# Expands to code that defines a variable or macro minus_zerod.
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AC_DEFUN([gl_DOUBLE_MINUS_ZERO_CODE],
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[[
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#include <float.h>
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/* minus_zerod represents the value -0.0. */
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/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
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ICC 10.0 has a bug when optimizing the expression -zero.
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The expression -DBL_MIN * DBL_MIN does not work when cross-compiling
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to PowerPC on Mac OS X 10.5. */
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#if defined __hpux || defined __sgi || defined __ICC
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static double
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compute_minus_zerod (void)
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{
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return -DBL_MIN * DBL_MIN;
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}
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# define minus_zerod compute_minus_zerod ()
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#else
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double minus_zerod = -0.0;
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#endif
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]])
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# Expands to code that defines a variable or macro minus_zerol.
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AC_DEFUN([gl_LONG_DOUBLE_MINUS_ZERO_CODE],
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[[
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#include <float.h>
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#if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__)
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# undef LDBL_MIN
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# define LDBL_MIN 3.3621031431120935063E-4932L
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#endif
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/* minus_zerol represents the value -0.0L. */
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/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L.
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IRIX cc can't put -0.0L into .data, but can compute at runtime.
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ICC 10.0 has a bug when optimizing the expression -zero.
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The expression -LDBL_MIN * LDBL_MIN does not work when cross-compiling
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to PowerPC on Mac OS X 10.5. */
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#if defined __hpux || defined __sgi || defined __ICC
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static long double
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compute_minus_zerol (void)
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{
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return -LDBL_MIN * LDBL_MIN;
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}
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# define minus_zerol compute_minus_zerol ()
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#else
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long double minus_zerol = -0.0L;
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#endif
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]])
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