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

[Khem Raj]

On Mar 11, 2013, at 3:32 AM, Matthieu CRAPET <Matthieu.CRAPET at ingenico.com> wrote:

> 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'


somewhere I think lib tool is not honoring the sys root. Figure that out.

>  
> 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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