37 lines
802 B
Text
37 lines
802 B
Text
dnl @synopsis LIB_MATH
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dnl
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dnl This macro figures out how whether programs using C's math routines
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dnl need to link to libm or not. This is common on SysV Unices.
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dnl
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dnl @category C
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dnl @author Warren Young <warren@etr-usa.com>
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dnl @version 1.2, 2006-03-06
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AC_DEFUN([LIB_MATH],
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[
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AC_MSG_CHECKING([whether -lm is needed to use C math functions])
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MYSQLPP_EXTRA_LIBS=
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TRY_LIBM=no
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AC_TRY_LINK(
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[ #include <math.h> ],
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[ floor(0); ], AC_MSG_RESULT(no), TRY_LIBM=yes)
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if test "x$TRY_LIBM" = "xyes"
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then
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save_LIBS=$LIBS
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LIBS="$LIBS -lm"
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AC_TRY_LINK(
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[ #include <math.h> ],
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[ floor(0); ],
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[
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MYSQLPP_EXTRA_LIBS=-lm
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AC_MSG_RESULT(yes)
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],
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AC_MSG_ERROR([Failed to build program containing math functions!]))
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LIBS="$save_LIBS"
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fi
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AC_SUBST(MYSQLPP_EXTRA_LIBS)
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])
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