86 lines
2.6 KiB
Plaintext
86 lines
2.6 KiB
Plaintext
# rintl.m4
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# serial 11
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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_RINTL],
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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 rintl().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Determine RINTL_LIBM.
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gl_MATHFUNC([rintl], [long double], [(long double)])
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if test $gl_cv_func_rintl_no_libm = yes \
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|| test $gl_cv_func_rintl_in_libm = yes; then
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if test $REPLACE_RINTL = 0; then
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether rintl works],
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[gl_cv_func_rintl_works],
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[
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saved_LIBS="$LIBS"
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LIBS="$LIBS $RINTL_LIBM"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#include <math.h>
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#undef rintl
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extern
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#ifdef __cplusplus
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"C"
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#endif
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long double rintl (long double);
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static long double dummy (long double x) { return 0; }
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int main (int argc, char *argv[])
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{
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long double (* volatile my_rintl) (long double) = argc ? rintl : dummy;
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int result = 0;
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/* This test fails on NetBSD 9.0. */
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{
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volatile long double x = -0.3L;
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long double y = my_rintl (x);
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if (!(y == 0.0L))
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result |= 1;
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}
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return result;
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}
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]])],
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[gl_cv_func_rintl_works=yes],
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[gl_cv_func_rintl_works=no],
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_rintl_works="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl* | midipix*) gl_cv_func_rintl_works="guessing yes" ;;
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# Guess yes on native Windows.
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mingw* | windows*) gl_cv_func_rintl_works="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_rintl_works="$gl_cross_guess_normal" ;;
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esac
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])
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LIBS="$saved_LIBS"
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])
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case "$gl_cv_func_rintl_works" in
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*yes) ;;
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*) REPLACE_RINTL=1 ;;
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esac
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fi
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else
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HAVE_RINTL=0
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fi
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if test $HAVE_RINTL = 0 || test $REPLACE_RINTL = 1; then
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dnl Find libraries needed to link lib/rintl.c.
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if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
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AC_REQUIRE([gl_FUNC_RINT])
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RINTL_LIBM="$RINT_LIBM"
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else
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RINTL_LIBM=
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fi
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fi
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AC_SUBST([RINTL_LIBM])
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])
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