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Diffstat (limited to 'gl/m4/floorf.m4')
| -rw-r--r-- | gl/m4/floorf.m4 | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gl/m4/floorf.m4 b/gl/m4/floorf.m4 new file mode 100644 index 0000000..c49ffa6 --- /dev/null +++ b/gl/m4/floorf.m4 @@ -0,0 +1,113 @@ +# floorf.m4 serial 18 +dnl Copyright (C) 2007, 2009-2023 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>]]) + if test "$ac_cv_have_decl_floorf" = yes; then + dnl Test whether floorf() can be used without libm. + gl_FUNC_FLOORF_LIBS + if test "$FLOORF_LIBM" = "?"; then + dnl Sun C 5.0 on Solaris declares floorf() and has it in the system-wide + 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 $FLOORF_LIBM" + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ +#ifndef __NO_MATH_INLINES +# define __NO_MATH_INLINES 1 /* for glibc */ +#endif +#include <math.h> +]gl_FLOAT_MINUS_ZERO_CODE[ +]gl_FLOAT_SIGNBIT_CODE[ +static float dummy (float f) { return 0; } +int main (int argc, char *argv[]) +{ + float (* volatile my_floorf) (float) = argc ? floorf : dummy; + /* Test whether floorf (-0.0f) is -0.0f. */ + if (signbitf (minus_zerof) && !signbitf (my_floorf (minus_zerof))) + return 1; + return 0; +} + ]])], + [gl_cv_func_floorf_ieee=yes], + [gl_cv_func_floorf_ieee=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_floorf_ieee="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) gl_cv_func_floorf_ieee="guessing yes" ;; + # Guess yes on native Windows. + mingw*) gl_cv_func_floorf_ieee="guessing yes" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_floorf_ieee="$gl_cross_guess_normal" ;; + esac + ]) + LIBS="$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 $REPLACE_FLOORF = 1; then + dnl No libraries are needed to link lib/floorf.c. + FLOORF_LIBM= + fi + AC_SUBST([FLOORF_LIBM]) +]) + +# Determines the libraries needed to get the floorf() function. +# Sets FLOORF_LIBM. +AC_DEFUN([gl_FUNC_FLOORF_LIBS], +[ + gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [ + gl_cv_func_floorf_libm=? + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#ifndef __NO_MATH_INLINES + # define __NO_MATH_INLINES 1 /* for glibc */ + #endif + #include <math.h> + float (*funcptr) (float) = floorf; + float x;]], + [[x = funcptr(x) + floorf(x);]])], + [gl_cv_func_floorf_libm=]) + if test "$gl_cv_func_floorf_libm" = "?"; then + save_LIBS="$LIBS" + LIBS="$LIBS -lm" + AC_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="$save_LIBS" + fi + ]) + FLOORF_LIBM="$gl_cv_func_floorf_libm" +]) |