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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.
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
# cbrt.m4
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# serial 3
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dnl Copyright (C) 2012-2024 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_CBRT],
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[
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare cbrt().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Determine CBRT_LIBM.
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gl_COMMON_DOUBLE_MATHFUNC([cbrt])
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dnl Test whether cbrt() exists.
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saved_LIBS="$LIBS"
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LIBS="$LIBS $CBRT_LIBM"
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AC_CHECK_FUNCS([cbrt])
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LIBS="$saved_LIBS"
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if test $ac_cv_func_cbrt = no; then
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HAVE_CBRT=0
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dnl Find libraries needed to link lib/cbrt.c.
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AC_REQUIRE([gl_FUNC_FABS])
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AC_REQUIRE([gl_FUNC_FREXP])
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AC_REQUIRE([gl_FUNC_LDEXP])
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CBRT_LIBM=
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dnl Append $FABS_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
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case " $CBRT_LIBM " in
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*" $FABS_LIBM "*) ;;
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*) CBRT_LIBM="$CBRT_LIBM $FABS_LIBM" ;;
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esac
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dnl Append $FREXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
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case " $CBRT_LIBM " in
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*" $FREXP_LIBM "*) ;;
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*) CBRT_LIBM="$CBRT_LIBM $FREXP_LIBM" ;;
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esac
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dnl Append $LDEXP_LIBM to CBRT_LIBM, avoiding gratuitous duplicates.
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case " $CBRT_LIBM " in
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*" $LDEXP_LIBM "*) ;;
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*) CBRT_LIBM="$CBRT_LIBM $LDEXP_LIBM" ;;
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esac
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fi
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])
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