ltdl and C++

[Alessandro Candini]

Hi everyone.
I have a problem making ltdl library work with some C++ code.
I have implemented my personal version of the example at the end of 
Chapter 7 in the book "Autotools" by John Calcote.
Basically it is the same, but I have C++ source files and I use g++ 
instead of gcc.
Configure and make works but I do not produce a dynamic linked 
executable, unlike the original John's example:
../src $ ldd hello
    not a dynamic executable

And I noticed that during compilation the fPIC flag is used although I 
removed every reference to it in all my Makefile.am files.

Do you have any ideas?

Here is my configure.ac:

AC_PREREQ([2.67])
AC_INIT([hello], [1.0], address@hidden, [], [www.meeo.it])
AM_INIT_AUTOMAKE
LT_PREREQ([2.2])
LT_INIT([dlopen])
AC_CONFIG_SRCDIR([src/hello.cpp])
AC_CONFIG_HEADERS([config.h])

# Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_CHECK_PROG([bash_shell],[bash -x],[bash -x],,,[/usr/sbin/bash])
AC_PROG_INSTALL
# AC_PROG_RANLIB
AC_PROG_CC_C_O
AC_SUBST([CXXFLAGS], ["-Wall -g -O2"])

# Checks for command line options.
AC_ARG_ENABLE([async-exec],
          [AS_HELP_STRING([--disable-async-exec],
                  [disable asynchronous execution @<:@default: no@:>@])],
          [async_exec=${enableval}], [async_exec=yes])

# Checks for libraries.
if test "x${async_exec}" = xyes; then
    have_pthreads=no
    AC_SEARCH_LIBS([pthread_create], [pthread], [have_pthreads=yes])

    if test "x${have_pthreads}" = xyes; then
        AC_CHECK_HEADERS([pthread.h], [], [have_pthreads=no])
    fi

    if test "x${have_pthreads}" = xno; then
        AC_MSG_WARN([
             -----------------------------------------
             Unable to find pthreads on this system.
             Building a single-threaded version.
             -----------------------------------------])
        async_exec=no
    fi
fi

if test "x${async_exec}" = xyes; then
    AC_DEFINE([ASYNC_EXEC], 1, [async execution enabled])
fi
# Checks for typedefs, structures, and compiler characteristics.

# Checks for header files.
AC_CHECK_HEADERS([stdlib.h ltdl.h])

# Checks for library functions.
#AC_SEARCH_LIBS([dlopen], [dl])
AC_SEARCH_LIBS([lt_dlopen], [ltdl])

AC_CONFIG_FILES([Makefile
                 common/Makefile
                 include/Makefile
                 libhello/Makefile
                 src/Makefile
                 src/modules/hithere/Makefile])
AC_OUTPUT

--
Alessandro Candini

MEEO S.r.l.
Via Saragat 9
I-44122 Ferrara, Italy
Tel: +39 0532 1861501
Fax: +39 0532 1861637
http://www.meeo.it

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