mkvtoolnix/ac/ebml.m4

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dnl
dnl Test for libebml, and define EBML_CFLAGS and EBML_LDFLAGS
dnl
ebml_ver_req_major=1
ebml_ver_req_minor=3
ebml_ver_req_micro=0
AC_CACHE_CHECK([for libEBML headers version >= ${ebml_ver_req_major}.${ebml_ver_req_minor}.${ebml_ver_req_micro}],
[ac_cv_ebml_found],[
ac_save_CXXFLAGS="$CXXFLAGS"
ac_save_LIBS="$LIBS"
LIBS="$LIBS -lebml"
AC_LANG_PUSH(C++)
AC_TRY_COMPILE([
#include <ebml/EbmlVersion.h>
#include <ebml/EbmlDummy.h>
using namespace libebml;
#if LIBEBML_VERSION < ((${ebml_ver_req_major} << 16) + (${ebml_ver_req_minor} << 8) + ${ebml_ver_req_micro})
# error libebml is too old
#endif
],
[],
ac_cv_ebml_found=yes,
ac_cv_ebml_found=no)
if test "${ac_cv_ebml_found}" = "no" ; then
EBML_CFLAGS="-I/usr/local/include"
EBML_LDFLAGS="-L/usr/local/lib"
CXXFLAGS="-I/usr/local/include $CXXFLAGS"
LIBS="-L/usr/local/lib $LIBS"
AC_TRY_COMPILE([
#include <ebml/EbmlVersion.h>
#include <ebml/EbmlDummy.h>
using namespace libebml;
#if LIBEBML_VERSION < ((${ebml_ver_req_major} << 16) + (${ebml_ver_req_minor} << 8) + ${ebml_ver_req_micro})
# error libebml is too old
#endif
],
[],
ac_cv_ebml_found=yes,
ac_cv_ebml_found=no)
fi
AC_LANG_POP
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
if test x"${ac_cv_ebml_found}" != "xyes" ; then
ac_cv_ebml_found=internal
fi
])
if test x"${ac_cv_ebml_found}" = "xinternal" ; then
if ! test -f lib/libebml/ebml/EbmlVersion.h ; then
echo '*** The internal version of the libEBML library is supposed to be used,'
echo '*** but it was not found in "lib/libebml". If this is a clone from the'
echo '*** git repository then submodules have to be initialized with the'
echo '*** following two commands:'
echo '***'
echo '*** git submodule init'
echo '*** git submodule update'
exit 1
fi
EBML_CFLAGS="-Ilib/libebml"
EBML_LDFLAGS="-Llib/libebml/src"
else
dnl
dnl Test if libebml has to be compiled with -DEBML_DLL on Windows.
dnl
ebml_check_msg_nodll="yes, without -DEBML_DLL"
ebml_check_msg_dll="yes, with -DEBML_DLL"
AC_CACHE_CHECK([if linking against libEBML works and if it requires -DEBML_DLL],
[ac_cv_ebml_dll],[
AC_LANG_PUSH(C++)
ac_save_CXXFLAGS="$CXXFLAGS"
ac_save_LIBS="$LIBS"
CXXFLAGS="$CXXFLAGS $EBML_CFLAGS"
LIBS="$LIBS $EBML_LDFLAGS -lebml"
AC_TRY_LINK([
#include <ebml/EbmlVersion.h>
#include <ebml/EbmlDummy.h>
using namespace libebml;
],
[EbmlDummy d;],
ac_cv_ebml_dll="${ebml_check_msg_nodll}",
ac_cv_ebml_dll="not found")
if test x"${ac_cv_mingw32}" = "xyes" ; then
if test x"${ac_cv_ebml_dll}" != "x${ebml_check_msg_nodll}" ; then
CXXFLAGS="$CXXFLAGS -DEBML_DLL"
AC_TRY_LINK([
#include <ebml/EbmlVersion.h>
#include <ebml/EbmlDummy.h>
using namespace libebml;
],
[EbmlDummy d;],
ac_cv_ebml_dll="${ebml_check_msg_dll}")
fi
fi
AC_LANG_POP
CXXFLAGS="${ac_save_CXXFLAGS}"
LIBS="${ac_save_LIBS}"
])
if test x"${ac_cv_ebml_dll}" != "x${ebml_check_msg_dll}" -a x"${ac_cv_ebml_dll}" != "x${ebml_check_msg_nodll}" ; then
echo '*** The libEBML library was not found.'
exit 1
fi
fi
if test x"${ac_cv_ebml_dll}" = "x${ebml_check_msg_dll}" ; then
EBML_CFLAGS="$EBML_CFLAGS -DEBML_DLL"
fi
AC_SUBST(EBML_CFLAGS)
AC_SUBST(EBML_LDFLAGS)