145 lines
4.3 KiB
Plaintext
145 lines
4.3 KiB
Plaintext
# expm1f.m4
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# serial 7
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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_EXPM1F],
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[
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m4_divert_text([DEFAULTS], [gl_expm1f_required=plain])
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_EXPM1])
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dnl Persuade glibc <math.h> to declare expm1f().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether expm1f() exists. Assume that expm1f(), if it exists, is
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dnl defined in the same library as expm1().
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXPM1_LIBM"
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AC_CHECK_FUNCS([expm1f])
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LIBS="$saved_LIBS"
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if test $ac_cv_func_expm1f = yes; then
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EXPM1F_LIBM="$EXPM1_LIBM"
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXPM1F_LIBM"
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gl_FUNC_EXPM1F_WORKS
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LIBS="$saved_LIBS"
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case "$gl_cv_func_expm1f_works" in
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*yes) ;;
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*) REPLACE_EXPM1F=1 ;;
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esac
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m4_ifdef([gl_FUNC_EXPM1F_IEEE], [
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if test $gl_expm1f_required = ieee && test $REPLACE_EXPM1F = 0; then
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether expm1f works according to ISO C 99 with IEC 60559],
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[gl_cv_func_expm1f_ieee],
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[
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saved_LIBS="$LIBS"
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LIBS="$LIBS $EXPM1F_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_FLOAT_MINUS_ZERO_CODE[
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]gl_FLOAT_SIGNBIT_CODE[
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#ifndef expm1f
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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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float expm1f (float);
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#endif
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/* Compare two numbers with ==.
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This is a separate function because IRIX 6.5 "cc -O" miscompiles an
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'x == x' test. */
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static int
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numeric_equal (float x, float y)
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{
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return x == y;
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}
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static float dummy (float x) { return 0; }
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int main (int argc, char *argv[])
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{
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float (* volatile my_expm1f) (float) = argc ? expm1f : dummy;
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/* Test expm1f(-0.0f).
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This test fails on AIX 7.2. */
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float y = my_expm1f (minus_zerof);
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if (signbitf (minus_zerof) && !signbitf (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_expm1f_ieee=yes],
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[gl_cv_func_expm1f_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_expm1f_ieee="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl* | midipix*) gl_cv_func_expm1f_ieee="guessing yes" ;;
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# Guess yes on native Windows.
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mingw* | windows*) gl_cv_func_expm1f_ieee="guessing yes" ;;
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# Guess no on AIX.
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aix*) gl_cv_func_expm1f_ieee="guessing no" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_expm1f_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_expm1f_ieee" in
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*yes) ;;
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*) REPLACE_EXPM1F=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_EXPM1F=0
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fi
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if test $HAVE_EXPM1F = 0 || test $REPLACE_EXPM1F = 1; then
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dnl Find libraries needed to link lib/expm1f.c.
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EXPM1F_LIBM="$EXPM1_LIBM"
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fi
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AC_SUBST([EXPM1F_LIBM])
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])
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dnl Test whether expm1f() works.
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dnl On IRIX 6.5, for arguments <= -17.32868, it returns -5.6295e14.
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AC_DEFUN([gl_FUNC_EXPM1F_WORKS],
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether expm1f works], [gl_cv_func_expm1f_works],
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[
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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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volatile float x;
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float y;
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int main ()
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{
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x = -100.0f;
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y = expm1f (x);
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if (y < -1.0f)
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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_expm1f_works=yes],
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[gl_cv_func_expm1f_works=no],
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[case "$host_os" in
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irix*) gl_cv_func_expm1f_works="guessing no" ;;
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# Guess yes on native Windows.
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mingw* | windows*) gl_cv_func_expm1f_works="guessing yes" ;;
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*) gl_cv_func_expm1f_works="guessing yes" ;;
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esac
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])
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])
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])
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