Re: [poky] shared library location and linking

I found my issue described here, more or less exactly:

https://docs.yoctoproject.org/ref-manual/variables.html#term-SYSROOT_DIRS_IGNORE

For me it turns out to need in recipe of lib:
SYSROOT_DIRS:append = " /opt/lib"

and in recipe of app, using that lib:
TARGET_LDFLAGS:append = " -L${RECIPE_SYSROOT}/opt/lib"

But that's not helping. Looking at bitbake <recipe_app> -e I can't see
why linker does not find it. As mentioned
${WORKDIR}/recipe-sysroot/opt/lib is populated for the app.
A bug? Usually I am just miss something, but I don't have a clue how to
debug.

Best regards,
Steve


> Hello,
> I have a problem if a shared lib should be located in some other than
> usual folder - in /opt/lib in my example. Althoug not usual, it should
> be possible, right?
> The lib itself is created well and with that including in recipe (which
> tooks me some time to find):
> SYSROOT_DIRS += "/opt/lib"
> this lib is also populated into sysroot-destdir/opt/lib
>
> But recipe of app, that is depending on that lib, will not link -
> although the lib is located in build directory of app in
> recipe-sysroot/opt/lib (thanks to the trick above).
>
> I couldn't figure out what is the problem:
>
> | arm-poky-linux-gnueabi-gcc  -mfpu=neon -mfloat-abi=hard
> -mcpu=cortex-a9 -fstack-protector-strong  -O2 -D_FORTIFY_SOURCE=2
> -Wformat -Wformat-security -Werror=format-security
> --sysroot=/home/user/y/yocto_4014_sp2/build/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/sps/0.1-r0/recipe-sysroot
> sps.c -L/opt/lib -lvision-device -o sps
> |
> /home/user/y/yocto_4014_sp2/build/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/sps/0.1-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/11.4.0/ld:
> cannot find -lvision-device: No such file or directory
> | collect2: error: ld returned 1 exit status
>
> I don't know where the linker is looking for? Just as a dirty hack I
> copied the libs in recipe as below, it works:
>
> do_compile () {
>      cp recipe-sysroot/opt/lib/* recipe-sysroot/usr/lib
>      oe_runmake -f Makefile-sps
> }
>
> I seems the -L is not passed through!? Is it a bug? Or what do I miss?
>
> Best regards and any help is welcome.
> Steve
>
> PS: Makefile is as simple:
>
> LIBSINC  = -L/opt/lib
> LIBS     = -lvision-device
>
> all: sps
>
> sps: *.c
>          $(CC) sps.c $(LIBSINC) $(LIBS) -o sps
>
> clean:
>          rm -f sps
>
>
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