113 lines
3.9 KiB
Text
113 lines
3.9 KiB
Text
# floorf.m4 serial 18
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dnl Copyright (C) 2007, 2009-2023 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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AC_DEFUN([gl_FUNC_FLOORF],
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[
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m4_divert_text([DEFAULTS], [gl_floorf_required=plain])
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AC_REQUIRE([gl_MATH_H_DEFAULTS])
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dnl Persuade glibc <math.h> to declare floorf().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether floorf() is declared.
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AC_CHECK_DECLS([floorf], , , [[#include <math.h>]])
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if test "$ac_cv_have_decl_floorf" = yes; then
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dnl Test whether floorf() can be used without libm.
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gl_FUNC_FLOORF_LIBS
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if test "$FLOORF_LIBM" = "?"; then
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dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide
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dnl libm.so, but not in the libm.so that the compiler uses.
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REPLACE_FLOORF=1
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fi
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m4_ifdef([gl_FUNC_FLOORF_IEEE], [
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if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559],
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[gl_cv_func_floorf_ieee],
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[
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save_LIBS="$LIBS"
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LIBS="$LIBS $FLOORF_LIBM"
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AC_RUN_IFELSE(
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[AC_LANG_SOURCE([[
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#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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]gl_FLOAT_MINUS_ZERO_CODE[
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]gl_FLOAT_SIGNBIT_CODE[
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static float dummy (float f) { return 0; }
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int main (int argc, char *argv[])
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{
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float (* volatile my_floorf) (float) = argc ? floorf : dummy;
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/* Test whether floorf (-0.0f) is -0.0f. */
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if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof)))
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return 1;
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return 0;
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}
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]])],
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[gl_cv_func_floorf_ieee=yes],
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[gl_cv_func_floorf_ieee=no],
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[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_floorf_ieee="guessing yes" ;;
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# Guess yes on musl systems.
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*-musl*) gl_cv_func_floorf_ieee="guessing yes" ;;
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# Guess yes on native Windows.
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mingw*) gl_cv_func_floorf_ieee="guessing yes" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_floorf_ieee="$gl_cross_guess_normal" ;;
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esac
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])
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LIBS="$save_LIBS"
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])
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case "$gl_cv_func_floorf_ieee" in
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*yes) ;;
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*) REPLACE_FLOORF=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_DECL_FLOORF=0
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fi
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if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then
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dnl No libraries are needed to link lib/floorf.c.
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FLOORF_LIBM=
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fi
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AC_SUBST([FLOORF_LIBM])
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])
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# Determines the libraries needed to get the floorf() function.
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# Sets FLOORF_LIBM.
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AC_DEFUN([gl_FUNC_FLOORF_LIBS],
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[
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gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [
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gl_cv_func_floorf_libm=?
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[#ifndef __NO_MATH_INLINES
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# define __NO_MATH_INLINES 1 /* for glibc */
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#endif
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#include <math.h>
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float (*funcptr) (float) = floorf;
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float x;]],
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[[x = funcptr(x) + floorf(x);]])],
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[gl_cv_func_floorf_libm=])
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if test "$gl_cv_func_floorf_libm" = "?"; then
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save_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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float (*funcptr) (float) = floorf;
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float x;]],
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[[x = funcptr(x) + floorf(x);]])],
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[gl_cv_func_floorf_libm="-lm"])
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LIBS="$save_LIBS"
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fi
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])
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FLOORF_LIBM="$gl_cv_func_floorf_libm"
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])
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