Writing a Module for Hyrax

Other guides:

• Hyrax_-_Create_BES_Module
• Hyrax_-_Extending_BES_Module
• Hyrax_-_Example_BES_Modules

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Including the library ...

It's often easiest for people building from source code if the data access API used by the handler is included in the source.

Support three options:

1. using --enable-local-API
2. using --with-API-prefix
3. finding a copy installed on the build OS

Here's how

GDAL_FOUND=

AC_ARG_WITH(gdal,[ AS_HELP_STRING ([--with-gdal], [Use the copy of GDAL at this location]) ])
#            with_gdal_prefix="$withval", with_gdal_prefix="")

if test -n "$with_gdal_prefix" -a -x $with_gdal_prefix/bin/gdal-config
then
    AC_MSG_NOTICE([Using $with_gdal_prefix as the GDAL prefix directory.])
    GDAL_LDFLAGS="`$with_gdal_prefix/bin/gdal-config --libs`"
    GDAL_CFLAGS="`$with_gdal_prefix/bin/gdal-config --cflags`"
    GDAL_FOUND="yes"
elif test -n "$with_gdal_prefix"
then
    AC_MSG_ERROR([You set the gdal-prefix directory to $with_gdal_prefix, but gdal-config is not there.])
fi

AC_ARG_ENABLE(local-gdal, [ AS_HELP_STRING ([--enable_local-gdal], [Build and use the local copy of GDAL]) ])

AC_MSG_NOTICE([enable_local_gdal: >$enable_local_gdal<])
if test -n "$enable_local_gdal" -a "$enable_local_gdal" = "yes"
then
    AC_MSG_NOTICE([Building the local GDAL library.])
    gdal_prx=`pwd`/gdal-1.9.1/build
    if (cd gdal-1.9.1 && ./configure --prefix=$gdal_prx --disable-shared && make -j9 && make install)
    then
        GDAL_LDFLAGS="`$gdal_prx/bin/gdal-config --libs`"
        GDAL_CFLAGS="`$gdal_prx/bin/gdal-config --cflags`"
        AC_SUBST([GDAL_LDFLAGS])
        AC_SUBST([GDAL_CFLAGS])
        GDAL_FOUND="yes"
    
        # AC_MSG_NOTICE(["GDAL_LDFLAGS status >$GDAL_LDFLAGS<"])
        # AC_MSG_NOTICE(["GDAL_CFLAGS status >$GDAL_CFLAGS<"])
    else
        AC_MSG_ERROR([I could not build GDAL.])
    fi
fi

if test -z "$GDAL_FOUND"
then
    AX_LIB_GDAL([1.7.2])
    if test ! -z "$GDAL_CFLAGS" -a ! -z "$GDAL_LDFLAGS"; then
        GDAL_FOUND="yes"
    fi
fi

if test -z "$GDAL_FOUND"
then
    AC_MSG_ERROR([I could not find GDAL.])
fi