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34 lines
997 B
Plaintext
34 lines
997 B
Plaintext
# fabsl.m4
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# serial 6
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dnl Copyright (C) 2011-2026 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_FABSL],
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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 fabsl().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Determine FABSL_LIBM.
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gl_MATHFUNC([fabsl], [long double], [(long double)])
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if test $gl_cv_func_fabsl_no_libm != yes \
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&& test $gl_cv_func_fabsl_in_libm != yes; then
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HAVE_FABSL=0
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fi
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if test $HAVE_FABSL = 0; then
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dnl Find libraries needed to link lib/fabsl.c.
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if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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AC_REQUIRE([gl_FUNC_FABS])
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FABSL_LIBM="$FABS_LIBM"
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else
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FABSL_LIBM=
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fi
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fi
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AC_SUBST([FABSL_LIBM])
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])
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