Hello,
I'm trying to write a macro that will iterate through a list of
libraries looking for a function. If it is found, I wish to do a
AC_SUBST on a variable dependent on the name of the library.
e.g. LX_SEARCH_LIBS([nsl socket], [gethostbyname], [])
The output would either:
AC_SUBST(LIBNSL, "-lnsl")
or
AC_SUBST(LIBSOCKET, "-lsocket")
depending on where the function was found
I've got it to set the variable LIBNSL or LIBSOCKET appropriately. But
because I'm using AC_VAR_*, I don't know how to do an AC_SUBST on this
dynamically named variable.
All workarounds, hacks and the like are very welcome.
What I have now is:
# LX_SEARCH_LIBS(LIBRARIES, FUNCTION, [OTHER-LIBRARIES])
#
--------------------------------------------------------------------------
# We search through a list of libraries (separated by spaces) looking
for
# the function FUNCTION. You can specify other libraries that we need to
# link with.
#
# If the function is found, we produce the define
# #define HAVE_FUNCTION 1
#
# The variable "lx_cv_func_FUNCTION" is set with the name of the library
# that is required. If no library is required, "none" is set. If we
can't
# find the library, "no" is set.
AC_DEFUN([LX_SEARCH_LIBS],
[AC_MSG_CHECKING([for $2])
ac_check_lib_save_LIBS=$LIBS
LIBS="$3 $LIBS"
AS_VAR_PUSHDEF([ac_Lib], [lx_cv_func_$2])
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$2]), [1], [Function $2
defined])
AS_VAR_SET([ac_Lib], [none])
AC_MSG_RESULT([yes])],
[AS_VAR_SET([ac_Lib], [no])])
for lxlib in $1; do
if test AS_VAR_GET([ac_Lib]) = no; then
LIBS="-l$lxlib $3 $ac_check_lib_save_LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
[AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$2]), [1], [Function $2
defined])
AS_VAR_SET([ac_Lib], [$lxlib])
AS_VAR_PUSHDEF([lx_liblib], [AS_TR_CPP([LIB$lxlib])])
AS_VAR_SET([lx_liblib], [-l$lxlib])
>>> PROBLEM IS HERE
AC_SUBST(lx_liblib)
>>> ---------------
AS_VAR_POPDEF([lx_liblib])
AC_MSG_RESULT([yes in $lxlib])],
[AS_VAR_SET([ac_Lib], [no])])
fi
done
if test AS_VAR_GET([ac_Lib]) = no; then
AC_MSG_RESULT([no])
fi
AS_VAR_POPDEF([ac_Lib])
LIBS=$ac_check_lib_save_LIBS
])
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