diff options
Diffstat (limited to 'gnulib/m4/floor.m4')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/m4/floor.m4 | 90 |
2 files changed, 90 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/m4/floor.m4 b/gnulib/m4/floor.m4 new file mode 100644 index 0000000..5de0da2 --- /dev/null +++ b/gnulib/m4/floor.m4 @@ -0,0 +1,90 @@ +# floor.m4 serial 7 +dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_FLOOR], +[ + m4_divert_text([DEFAULTS], [gl_floor_required=plain]) + AC_REQUIRE([gl_MATH_H_DEFAULTS]) + dnl Test whether floor() can be used without libm. + gl_FUNC_FLOOR_LIBS + if test "$FLOOR_LIBM" = "?"; then + FLOOR_LIBM= + fi + m4_ifdef([gl_FUNC_FLOOR_IEEE], [ + if test $gl_floor_required = ieee && test $REPLACE_FLOOR = 0; then + AC_CACHE_CHECK([whether floor works according to ISO C 99 with IEC 60559], + [gl_cv_func_floor_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $FLOOR_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_DOUBLE_MINUS_ZERO_CODE[ +]gl_DOUBLE_SIGNBIT_CODE[ +static double dummy (double f) { return 0; } +int main (int argc, char *argv[]) +{ + double (*my_floor) (double) = argc ? floor : dummy; + /* Test whether floor (-0.0) is -0.0. */ + if (signbitd (minus_zerod) && !signbitd (my_floor (minus_zerod))) + return 1; + return 0; +} + ]])], + [gl_cv_func_floor_ieee=yes], + [gl_cv_func_floor_ieee=no], + [gl_cv_func_floor_ieee="guessing no"]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_floor_ieee" in + *yes) ;; + *) REPLACE_FLOOR=1 ;; + esac + fi + ]) + if test $REPLACE_FLOOR = 1; then + dnl No libraries are needed to link lib/floor.c. + FLOOR_LIBM= + fi + AC_SUBST([FLOOR_LIBM]) +]) + +# Determines the libraries needed to get the floor() function. +# Sets FLOOR_LIBM. +AC_DEFUN([gl_FUNC_FLOOR_LIBS], +[ + gl_CACHE_VAL_SILENT([gl_cv_func_floor_libm], [ + gl_cv_func_floor_libm=? + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double x;]], + [[x = floor(x);]])], + [gl_cv_func_floor_libm=]) + if test "$gl_cv_func_floor_libm" = "?"; then + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + double x;]], + [[x = floor(x);]])], + [gl_cv_func_floor_libm="-lm"]) + LIBS="$save_LIBS" + fi + ]) + FLOOR_LIBM="$gl_cv_func_floor_libm" +]) |