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ax_cxx_have_system_v_math.m4
# ============================================================================== # https://www.gnu.org/software/autoconf-archive/ax_cxx_have_system_v_math.html # ============================================================================== # # SYNOPSIS # # AX_CXX_HAVE_SYSTEM_V_MATH # # DESCRIPTION # # If the compiler has the double math functions _class, trunc, itrunc, # nearest, rsqrt, uitrunc, copysign, drem, finite, and unordered, define # HAVE_SYSTEM_V_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_SYSTEM_V_MATH], [AX_CXX_HAVE_SYSTEM_V_MATH]) AC_DEFUN([AX_CXX_HAVE_SYSTEM_V_MATH], [AC_CACHE_CHECK(whether the compiler supports System V math library, ax_cv_cxx_have_system_v_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; _class(x); trunc(x); finite(x); itrunc(x); nearest(x); rsqrt(x); uitrunc(x); copysign(x,y); drem(x,y); unordered(x,y); return 0;], ax_cv_cxx_have_system_v_math=yes, ax_cv_cxx_have_system_v_math=no) LIBS="$ac_save_LIBS" AC_LANG_RESTORE ]) if test "$ax_cv_cxx_have_system_v_math" = yes; then AC_DEFINE(HAVE_SYSTEM_V_MATH,,[define if the compiler supports System V math library]) fi ])