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