Mercurial > gnulib
view m4/floorf.m4 @ 40109:e2e6dc79463b
Defeat current GCC optimizations in math autoconf tests.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Mark function pointer as 'volatile'.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/ilogb.m4 (gl_FUNC_ILOGB_WORKS): Likewise.
* m4/ilogbf.m4 (gl_FUNC_ILOGBF_WORKS): Likewise.
* m4/ilogbl.m4 (gl_FUNC_ILOGBL_WORKS): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 20 Jan 2019 21:19:41 +0100 |
parents | b06060465f09 |
children |
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# floorf.m4 serial 16 dnl Copyright (C) 2007, 2009-2019 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 native Windows. mingw*) 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 $REPLACE_FLOORF = 1; then dnl No libraries are needed to link lib/floorf.c. FLOORF_LIBM= fi AC_SUBST([FLOORF_LIBM]) ]) # Determines the libraries needed to get the floorf() function. # Sets FLOORF_LIBM. AC_DEFUN([gl_FUNC_FLOORF_LIBS], [ gl_CACHE_VAL_SILENT([gl_cv_func_floorf_libm], [ gl_cv_func_floorf_libm=? AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[#ifndef __NO_MATH_INLINES # define __NO_MATH_INLINES 1 /* for glibc */ #endif #include <math.h> float (*funcptr) (float) = floorf; float x;]], [[x = funcptr(x) + floorf(x);]])], [gl_cv_func_floorf_libm=]) if test "$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" ])