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b1f65faabb
* etc/license-notices/unlimited: Add a short warranty disclaimer sentence. * m4/*.m4: Update. * build-aux/prefix-gnulib-mk: Likewise. * HACKING: Likewise.
31 lines
970 B
Plaintext
31 lines
970 B
Plaintext
# copysignl.m4
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# serial 3
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dnl Copyright (C) 2011-2024 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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dnl This file is offered as-is, without any warranty.
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AC_DEFUN([gl_FUNC_COPYSIGNL],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
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dnl Persuade glibc <math.h> to declare copysignl().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Determine COPYSIGNL_LIBM.
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gl_MATHFUNC([copysignl], [long double], [(long double, long double)])
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if test $gl_cv_func_copysignl_no_libm = no \
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&& test $gl_cv_func_copysignl_in_libm = no; then
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HAVE_COPYSIGNL=0
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if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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AC_REQUIRE([gl_FUNC_COPYSIGN])
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COPYSIGNL_LIBM="$COPYSIGN_LIBM"
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else
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COPYSIGNL_LIBM=
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fi
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fi
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AC_SUBST([COPYSIGNL_LIBM])
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])
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