HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| 231c0e0e | 1 | # floor.m4 serial 7 |
| f0007cad | 2 | dnl Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc. |
| b81eb646 LC |
3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, | |
| 5 | dnl with or without modifications, as long as this notice is preserved. | |
| 6 | ||
| 7 | AC_DEFUN([gl_FUNC_FLOOR], | |
| 8 | [ | |
| 9 | m4_divert_text([DEFAULTS], [gl_floor_required=plain]) | |
| 10 | AC_REQUIRE([gl_MATH_H_DEFAULTS]) | |
| 11 | dnl Test whether floor() can be used without libm. | |
| 12 | gl_FUNC_FLOOR_LIBS | |
| 13 | if test "$FLOOR_LIBM" = "?"; then | |
| 14 | FLOOR_LIBM= | |
| 15 | fi | |
| 16 | m4_ifdef([gl_FUNC_FLOOR_IEEE], [ | |
| 17 | if test $gl_floor_required = ieee && test $REPLACE_FLOOR = 0; then | |
| 18 | AC_CACHE_CHECK([whether floor works according to ISO C 99 with IEC 60559], | |
| 19 | [gl_cv_func_floor_ieee], | |
| 20 | [ | |
| 21 | save_LIBS="$LIBS" | |
| 22 | LIBS="$LIBS $FLOOR_LIBM" | |
| 23 | AC_RUN_IFELSE( | |
| 24 | [AC_LANG_SOURCE([[ | |
| 25 | #ifndef __NO_MATH_INLINES | |
| 26 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 27 | #endif | |
| 28 | #include <math.h> | |
| 29 | ]gl_DOUBLE_MINUS_ZERO_CODE[ | |
| 30 | ]gl_DOUBLE_SIGNBIT_CODE[ | |
| 231c0e0e LC |
31 | static double dummy (double f) { return 0; } |
| 32 | int main (int argc, char *argv[]) | |
| b81eb646 | 33 | { |
| 231c0e0e | 34 | double (*my_floor) (double) = argc ? floor : dummy; |
| b81eb646 | 35 | /* Test whether floor (-0.0) is -0.0. */ |
| 231c0e0e | 36 | if (signbitd (minus_zerod) && !signbitd (my_floor (minus_zerod))) |
| b81eb646 LC |
37 | return 1; |
| 38 | return 0; | |
| 39 | } | |
| 40 | ]])], | |
| 41 | [gl_cv_func_floor_ieee=yes], | |
| 42 | [gl_cv_func_floor_ieee=no], | |
| 43 | [gl_cv_func_floor_ieee="guessing no"]) | |
| 44 | LIBS="$save_LIBS" | |
| 45 | ]) | |
| 46 | case "$gl_cv_func_floor_ieee" in | |
| 47 | *yes) ;; | |
| 48 | *) REPLACE_FLOOR=1 ;; | |
| 49 | esac | |
| 50 | fi | |
| 51 | ]) | |
| 52 | if test $REPLACE_FLOOR = 1; then | |
| 3d458a81 | 53 | dnl No libraries are needed to link lib/floor.c. |
| b81eb646 LC |
54 | FLOOR_LIBM= |
| 55 | fi | |
| 56 | AC_SUBST([FLOOR_LIBM]) | |
| 57 | ]) | |
| 58 | ||
| 59 | # Determines the libraries needed to get the floor() function. | |
| 60 | # Sets FLOOR_LIBM. | |
| 61 | AC_DEFUN([gl_FUNC_FLOOR_LIBS], | |
| 62 | [ | |
| 63 | gl_CACHE_VAL_SILENT([gl_cv_func_floor_libm], [ | |
| 64 | gl_cv_func_floor_libm=? | |
| 65 | AC_LINK_IFELSE( | |
| 66 | [AC_LANG_PROGRAM( | |
| 67 | [[#ifndef __NO_MATH_INLINES | |
| 68 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 69 | #endif | |
| 70 | #include <math.h> | |
| 71 | double x;]], | |
| 72 | [[x = floor(x);]])], | |
| 73 | [gl_cv_func_floor_libm=]) | |
| 74 | if test "$gl_cv_func_floor_libm" = "?"; then | |
| 75 | save_LIBS="$LIBS" | |
| 76 | LIBS="$LIBS -lm" | |
| 77 | AC_LINK_IFELSE( | |
| 78 | [AC_LANG_PROGRAM( | |
| 79 | [[#ifndef __NO_MATH_INLINES | |
| 80 | # define __NO_MATH_INLINES 1 /* for glibc */ | |
| 81 | #endif | |
| 82 | #include <math.h> | |
| 83 | double x;]], | |
| 84 | [[x = floor(x);]])], | |
| 85 | [gl_cv_func_floor_libm="-lm"]) | |
| 86 | LIBS="$save_LIBS" | |
| 87 | fi | |
| 88 | ]) | |
| 89 | FLOOR_LIBM="$gl_cv_func_floor_libm" | |
| 90 | ]) |