141 lines
4.8 KiB
Plaintext
141 lines
4.8 KiB
Plaintext
# expm1.m4
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# serial 12
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dnl Copyright (C) 2010-2024 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_EXPM1],
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[
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m4_divert_text([DEFAULTS], [gl_expm1_required=plain])
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare expm1().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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EXPM1_LIBM=
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AC_CACHE_CHECK([whether expm1() can be used without linking with libm],
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[gl_cv_func_expm1_no_libm],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double (* volatile funcptr) (double) = expm1;
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double x;]],
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[[return funcptr (x) > 0.5
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|| expm1 (x) > 0.5;]])],
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[gl_cv_func_expm1_no_libm=yes],
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[gl_cv_func_expm1_no_libm=no])
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])
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if test $gl_cv_func_expm1_no_libm = no; then
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AC_CACHE_CHECK([whether expm1() can be used with libm],
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[gl_cv_func_expm1_in_libm],
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[
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saved_LIBS="$LIBS"
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LIBS="$LIBS -lm"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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double (* volatile funcptr) (double) = expm1;
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double x;]],
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[[return funcptr (x) > 0.5
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|| expm1 (x) > 0.5;]])],
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[gl_cv_func_expm1_in_libm=yes],
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[gl_cv_func_expm1_in_libm=no])
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LIBS="$saved_LIBS"
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])
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if test $gl_cv_func_expm1_in_libm = yes; then
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EXPM1_LIBM=-lm
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fi
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fi
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if test $gl_cv_func_expm1_no_libm = yes \
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|| test $gl_cv_func_expm1_in_libm = yes; then
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:
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m4_ifdef([gl_FUNC_EXPM1_IEEE], [
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if test $gl_expm1_required = ieee && test $REPLACE_EXPM1 = 0; then
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether expm1 works according to ISO C 99 with IEC 60559],
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[gl_cv_func_expm1_ieee],
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[
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXPM1_LIBM"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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]gl_DOUBLE_MINUS_ZERO_CODE[
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]gl_DOUBLE_SIGNBIT_CODE[
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static double dummy (double x) { return 0; }
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int main (int argc, char *argv[])
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{
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double (* volatile my_expm1) (double) = argc ? expm1 : dummy;
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double y = my_expm1 (minus_zerod);
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if (!(y == 0.0) || (signbitd (minus_zerod) && !signbitd (y)))
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return 1;
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return 0;
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}
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]])],
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[gl_cv_func_expm1_ieee=yes],
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[gl_cv_func_expm1_ieee=no],
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_expm1_ieee="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl* | midipix*) gl_cv_func_expm1_ieee="guessing yes" ;;
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# Guess yes on native Windows.
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mingw* | windows*) gl_cv_func_expm1_ieee="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_expm1_ieee="$gl_cross_guess_normal" ;;
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esac
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])
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LIBS="$saved_LIBS"
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])
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case "$gl_cv_func_expm1_ieee" in
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*yes) ;;
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*) REPLACE_EXPM1=1 ;;
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esac
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fi
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])
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else
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HAVE_EXPM1=0
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fi
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if test $HAVE_EXPM1 = 0 || test $REPLACE_EXPM1 = 1; then
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dnl Find libraries needed to link lib/expm1.c.
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AC_REQUIRE([gl_FUNC_ISNAND])
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AC_REQUIRE([gl_FUNC_EXP])
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AC_REQUIRE([gl_FUNC_ROUND])
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AC_REQUIRE([gl_FUNC_LDEXP])
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EXPM1_LIBM=
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dnl Append $ISNAND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
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case " $EXPM1_LIBM " in
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*" $ISNAND_LIBM "*) ;;
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*) EXPM1_LIBM="$EXPM1_LIBM $ISNAND_LIBM" ;;
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esac
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dnl Append $EXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
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case " $EXPM1_LIBM " in
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*" $EXP_LIBM "*) ;;
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*) EXPM1_LIBM="$EXPM1_LIBM $EXP_LIBM" ;;
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esac
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dnl Append $ROUND_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
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case " $EXPM1_LIBM " in
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*" $ROUND_LIBM "*) ;;
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*) EXPM1_LIBM="$EXPM1_LIBM $ROUND_LIBM" ;;
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esac
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dnl Append $LDEXP_LIBM to EXPM1_LIBM, avoiding gratuitous duplicates.
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case " $EXPM1_LIBM " in
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*" $LDEXP_LIBM "*) ;;
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*) EXPM1_LIBM="$EXPM1_LIBM $LDEXP_LIBM" ;;
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esac
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fi
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AC_SUBST([EXPM1_LIBM])
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])
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