Blame m4/ax_cxx_have_isfinite.m4

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dnl @synopsis AX_CXX_HAVE_ISFINITE
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dnl
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dnl If isfinite() is available to the C++ compiler:
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dnl   define HAVE_ISFINITE
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dnl   add "-lm" to LIBS
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dnl
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AC_DEFUN([AX_CXX_HAVE_ISFINITE],
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  [ax_cxx_have_isfinite_save_LIBS=$LIBS
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   LIBS="$LIBS -lm"
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   AC_CACHE_CHECK(for isfinite, ax_cv_cxx_have_isfinite,
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    [AC_LANG_SAVE
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     AC_LANG_CPLUSPLUS
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     AC_LINK_IFELSE(
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       [AC_LANG_PROGRAM(
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         [[#include <math.h>]],
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         [[int f = isfinite( 3 );]])],
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       [ax_cv_cxx_have_isfinite=yes],
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       [ax_cv_cxx_have_isfinite=no])
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     AC_LANG_RESTORE])
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   if test "$ax_cv_cxx_have_isfinite" = yes; then
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     AC_DEFINE([HAVE_ISFINITE],1,[define if compiler has isfinite])
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   else
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     LIBS=$ax_cxx_have_isfinite_save_LIBS
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   fi
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])