28 lines
731 B
Plaintext
28 lines
731 B
Plaintext
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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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])
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