diff options
Diffstat (limited to 'gl/m4/floorf.m4')
| -rw-r--r-- | gl/m4/floorf.m4 | 84 |
1 files changed, 66 insertions, 18 deletions
diff --git a/gl/m4/floorf.m4 b/gl/m4/floorf.m4 index fb17a5ea..c892ff9c 100644 --- a/gl/m4/floorf.m4 +++ b/gl/m4/floorf.m4 @@ -1,16 +1,17 @@ -# floorf.m4 serial 6 -dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc. +# floorf.m4 serial 13 +dnl Copyright (C) 2007, 2009-2013 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_FLOORF], [ + m4_divert_text([DEFAULTS], [gl_floorf_required=plain]) AC_REQUIRE([gl_MATH_H_DEFAULTS]) dnl Persuade glibc <math.h> to declare floorf(). AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) dnl Test whether floorf() is declared. - AC_CHECK_DECLS([floorf], , , [#include <math.h>]) + AC_CHECK_DECLS([floorf], , , [[#include <math.h>]]) if test "$ac_cv_have_decl_floorf" = yes; then dnl Test whether floorf() can be used without libm. gl_FUNC_FLOORF_LIBS @@ -19,11 +20,54 @@ AC_DEFUN([gl_FUNC_FLOORF], dnl libm.so, but not in the libm.so that the compiler uses. REPLACE_FLOORF=1 fi + m4_ifdef([gl_FUNC_FLOORF_IEEE], [ + if test $gl_floorf_required = ieee && test $REPLACE_FLOORF = 0; then + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CACHE_CHECK([whether floorf works according to ISO C 99 with IEC 60559], + [gl_cv_func_floorf_ieee], + [ + save_LIBS="$LIBS" + LIBS="$LIBS $FLOORF_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_FLOAT_MINUS_ZERO_CODE[ +]gl_FLOAT_SIGNBIT_CODE[ +static float dummy (float f) { return 0; } +int main (int argc, char *argv[]) +{ + float (*my_floorf) (float) = argc ? floorf : dummy; + /* Test whether floorf (-0.0f) is -0.0f. */ + if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof))) + return 1; + return 0; +} + ]])], + [gl_cv_func_floorf_ieee=yes], + [gl_cv_func_floorf_ieee=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu*) gl_cv_func_floorf_ieee="guessing yes" ;; + # If we don't know, assume the worst. + *) gl_cv_func_floorf_ieee="guessing no" ;; + esac + ]) + LIBS="$save_LIBS" + ]) + case "$gl_cv_func_floorf_ieee" in + *yes) ;; + *) REPLACE_FLOORF=1 ;; + esac + fi + ]) else HAVE_DECL_FLOORF=0 fi if test $HAVE_DECL_FLOORF = 0 || test $REPLACE_FLOORF = 1; then - AC_LIBOBJ([floorf]) + dnl No libraries are needed to link lib/floorf.c. FLOORF_LIBM= fi AC_SUBST([FLOORF_LIBM]) @@ -35,24 +79,28 @@ AC_DEFUN([gl_FUNC_FLOORF_LIBS], [ gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [ gl_cv_func_floorf_libm=? - AC_TRY_LINK([ - #ifndef __NO_MATH_INLINES - # define __NO_MATH_INLINES 1 /* for glibc */ - #endif - #include <math.h> - float x;], - [x = floorf(x);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + float (*funcptr) (float) = floorf; + float x;]], + [[x = funcptr(x) + floorf(x);]])], [gl_cv_func_floorf_libm=]) if test "$gl_cv_func_floorf_libm" = "?"; then save_LIBS="$LIBS" LIBS="$LIBS -lm" - AC_TRY_LINK([ - #ifndef __NO_MATH_INLINES - # define __NO_MATH_INLINES 1 /* for glibc */ - #endif - #include <math.h> - float x;], - [x = floorf(x);], + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + float (*funcptr) (float) = floorf; + float x;]], + [[x = funcptr(x) + floorf(x);]])], [gl_cv_func_floorf_libm="-lm"]) LIBS="$save_LIBS" fi |