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m4/ac_cxx_have_system_v_math.m4

 

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dnl Available from the GNU Autoconf Macro Archive at:

 

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dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_system_v_math.html

 

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dnl

 

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AC_DEFUN([AC_CXX_HAVE_SYSTEM_V_MATH],

 

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[AC_CACHE_CHECK(whether the compiler supports System V math library,

 

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ac_cv_cxx_have_system_v_math,

 

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[AC_LANG_SAVE

 

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 AC_LANG_CPLUSPLUS

 

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 ac_save_LIBS="$LIBS"

 

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 LIBS="$LIBS -lm"

 

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 AC_TRY_LINK([

 

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#ifndef _ALL_SOURCE

 

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 #define _ALL_SOURCE

 

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#endif

 

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#ifndef _XOPEN_SOURCE

 

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 #define _XOPEN_SOURCE

 

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#endif

 

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#ifndef _XOPEN_SOURCE_EXTENDED

 

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 #define _XOPEN_SOURCE_EXTENDED 1

 

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#endif

 

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#include <math.h>],[double x = 1.0; double y = 1.0;

 

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_class(x); trunc(x); finite(x); itrunc(x); nearest(x); rsqrt(x); uitrunc(x);

 

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copysign(x,y); drem(x,y); unordered(x,y);

 

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return 0;],

 

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 ac_cv_cxx_have_system_v_math=yes, ac_cv_cxx_have_system_v_math=no)

 

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 LIBS="$ac_save_LIBS"

 

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 AC_LANG_RESTORE

 

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])

 

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if test "$ac_cv_cxx_have_system_v_math" = yes; then

 

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  AC_DEFINE(HAVE_SYSTEM_V_MATH,,[define if the compiler supports System V math library])

 

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fi

 

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])

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