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ax_cxx_have_ieee_math.m4
# =========================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_have_ieee_math.html # =========================================================================== # # SYNOPSIS # # AX_CXX_HAVE_IEEE_MATH # # DESCRIPTION # # If the compiler has the double math functions acosh, asinh, atanh, cbrt, # expm1, erf, erfc, isnan, j0, j1, jn, gamma, lgamma, ilogb, logb, log1p, # rint, y0, y1, yn, hypot, nextafter, remainder and scalb, define # HAVE_IEEE_MATH. # # LICENSE # # Copyright (c) 2008 Todd Veldhuizen # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty. #serial 7 AU_ALIAS([AC_CXX_HAVE_IEEE_MATH], [AX_CXX_HAVE_IEEE_MATH]) AC_DEFUN([AX_CXX_HAVE_IEEE_MATH], [AC_CACHE_CHECK(whether the compiler supports IEEE math library, ax_cv_cxx_have_ieee_math, [AC_LANG_SAVE AC_LANG_CPLUSPLUS ac_save_LIBS="$LIBS" LIBS="$LIBS -lm" AC_TRY_LINK([ #ifndef _ALL_SOURCE #define _ALL_SOURCE #endif #ifndef _XOPEN_SOURCE #define _XOPEN_SOURCE #endif #ifndef _XOPEN_SOURCE_EXTENDED #define _XOPEN_SOURCE_EXTENDED 1 #endif #include <math.h>],[double x = 1.0; double y = 1.0; int i = 1; acosh(x); asinh(x); atanh(x); cbrt(x); expm1(x); erf(x); erfc(x); isnan(x); j0(x); j1(x); jn(i,x); ilogb(x); logb(x); log1p(x); rint(x); y0(x); y1(x); yn(i,x); #ifdef _THREAD_SAFE gamma_r(x,&i); lgamma_r(x,&i); #else gamma(x); lgamma(x); #endif hypot(x,y); nextafter(x,y); remainder(x,y); scalb(x,y); return 0;], ax_cv_cxx_have_ieee_math=yes, ax_cv_cxx_have_ieee_math=no) LIBS="$ac_save_LIBS" AC_LANG_RESTORE ]) if test "$ax_cv_cxx_have_ieee_math" = yes; then AC_DEFINE(HAVE_IEEE_MATH,,[define if the compiler supports IEEE math library]) fi ])