[OE-core] Libtool & external toolchain & .la files

[Matthieu CRAPET]

Dear all,

I have some issue regarding  Libtool and my external toolchain (located in /opt)
I've created a basic C++ (STL) library using autotools.

My configure.ac is very simple:
<code>
AC_PREREQ([2.60])
AC_INIT([exemple], [1.2.3], [test at exemple.org])

AC_CONFIG_SRCDIR([Makefile.am])
AC_CANONICAL_HOST

AC_CONFIG_MACRO_DIR([m4])
AM_INIT_AUTOMAKE([foreign])

LT_PREREQ([2.4])
LT_INIT

dnl Check for progs
AC_PROG_CXX

AC_SUBST([LIBEXEMPLE_SO_VERSION], [1:2:3])

AC_OUTPUT([
    Makefile
])
</code>

Then I've made a basic OE recipe to build it:

<code>
SUMMARY = "Libtool simple exemple"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "\
                file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58 \
                file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420 \
"

PR = "r1"

SRC_URI = "git://xx.xx.xx.xx/libexemple.git"
SRCREV = "HEAD"
S = "${WORKDIR}/git"

inherit autotools
</code>

Works fine but resulting .la files (in libexemple-dev package) contains:

dependency_libs='/opt/...-linux-gnueabi/lib/libstdc++.la'

This is bad because if another program (using libtool) depends on libexample, libtool will search
libstdc++ in "${STAGING_DIR_HOST}/opt/...-linux-gnueabi/lib/libstdc++.la" (instead of "${STAGING_DIR_HOST}/lib/libstdc++.la").
I would like that dependency_libs points to openembedded sysroot.

Note: Toolchain's .la files located in ${STAGING_DIR_HOST} are correct (and not referencing /opt).

I am wondering what is the best workaround for this. For now I've patched my recipe:

<code>
do_compile_prepend () {
                cd ${S}
                sed -i -e  '/^compiler_lib_search_dirs=/s/.*/compiler_lib_search_dirs=""/' ${HOST_SYS}-libtool
                sed -i -e  '/^compiler_lib_search_path=/s/.*/compiler_lib_search_path=""/' ${HOST_SYS}-libtool
                sed -i -e  '/^sys_lib_search_path_spec=/s/.*/sys_lib_search_path_spec=""/' ${HOST_SYS}-libtool
}
</code>

Ugly but works because libstdc++ can be found (using --sysroot argument). But "dependency_libs" is empty is .la file.

In real life: this is libglu and glew.

Regards,
Matthieu Crapet
PS: "exemple" is french word for "example" ;)
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