mirror of https://gitee.com/openkylin/glib2.0.git
111 lines
2.9 KiB
Meson
111 lines
2.9 KiB
Meson
# Copyright (C) 2002-2004, 2006-2018 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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frexp_test = '''
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#define HAVE_DECL_ALARM 0
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#include <float.h>
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#include <math.h>
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#include <string.h>
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#if HAVE_DECL_ALARM
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# include <signal.h>
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# include <unistd.h>
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#endif
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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_zero (void)
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{
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return -DBL_MIN * DBL_MIN;
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}
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# define minus_zero compute_minus_zero ()
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#else
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double minus_zero = -0.0;
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#endif
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int main()
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{
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int result = 0;
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int i;
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volatile double x;
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double zero = 0.0;
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#if HAVE_DECL_ALARM
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/* NeXTstep 3.3 frexp() runs into an endless loop when called on an infinite
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number. Let the test fail in this case. */
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signal (SIGALRM, SIG_DFL);
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alarm (5);
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#endif
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/* Test on denormalized numbers. */
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for (i = 1, x = 1.0; i >= DBL_MIN_EXP; i--, x *= 0.5)
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;
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if (x > 0.0)
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{
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int exp;
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double y = frexp (x, &exp);
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/* On machines with IEEE754 arithmetic: x = 1.11254e-308, exp = -1022.
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On NetBSD: y = 0.75. Correct: y = 0.5. */
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if (y != 0.5)
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result |= 1;
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}
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/* Test on infinite numbers. */
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x = 1.0 / zero;
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{
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int exp;
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double y = frexp (x, &exp);
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if (y != x)
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result |= 2;
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}
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/* Test on negative zero. */
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x = minus_zero;
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{
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int exp;
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double y = frexp (x, &exp);
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if (memcmp (&y, &x, sizeof x))
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result |= 4;
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}
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x = 0.0;
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{
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int exp;
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double y = frexp (x, &exp);
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if (memcmp (&y, &x, sizeof x))
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result |= 8;
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}
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return result;
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}'''
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if meson.can_run_host_binaries()
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run_result = cc.run(frexp_test,
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name : 'frexp works',
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dependencies : [libm])
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rc = run_result.returncode()
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gl_cv_func_frexp_works = run_result.compiled() and rc == 0
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gl_cv_func_frexp_broken_beyond_repair = not gl_cv_func_frexp_works
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# bit 1 is not set
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if (rc == 1 or rc == 3 or rc == 5 or rc == 9 or
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rc == 7 or rc == 11 or rc == 13)
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gl_cv_func_frexp_broken_beyond_repair = true
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else
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gl_cv_func_frexp_broken_beyond_repair = false
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endif
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else
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if (host_system.startswith ('netbsd') or
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host_system.startswith ('irix'))
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gl_cv_func_frexp_works = false
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gl_cv_func_frexp_broken_beyond_repair = true
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elif host_system == 'windows'
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if cc.get_id () == 'msvc' or cc.get_id() == 'clang-cl'
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gl_cv_func_frexp_works = true
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gl_cv_func_frexp_broken_beyond_repair = false
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else
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gl_cv_func_frexp_works = false
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gl_cv_func_frexp_broken_beyond_repair = false
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endif
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else
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gl_cv_func_frexp_works = true
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gl_cv_func_frexp_broken_beyond_repair = false
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endif
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endif
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